IN SITU PILE TESTING PROCEDURE

The main objectives of the initial pile test are to verify the design capacity (compressive, tensile and lateral) of the pile before commencing installation of working piles and to evaluate the quality of pile installation works with TCVN 9393:2012 Piles – Standard test method in situ for piles under axial compressive, ASTM D1143: Standard Test Methods for Deep Foundation Under Static Axial Compressive Load.....

Document submission status: A For approval 08/12/2015 REV FOR APPROVAL DATE DESCRIPTION PREP CHCK APPD PROJECT: SONG HAU THERMAL POWER PLANT – TWO (2) X 600MW OWNER: OWNER’S CONSULTANT: VIETNAM OIL AND GAS GROUP (PVN) EPc CONTRACTor FICHTNER GmbH & Co KG PV ENGINEERING EPC’S CONSULTANT: VIETNAM MACHINERY INSTALLATION CORPORATION (LILAMA) TOKYO ELECTRIC POWER SERVICES COMPANY LIMITED -TEPSCO SUB-CONTRACTOR HANOI CONTRUCTION CORPORATION-JSC Date Name Prepared 08/12/2015 N.Q.Khan h Checked 08/12/2015 B.T.Son Approved 08/12/2015 T.V.Dũng Signature Document Title IN-SITU PILE TESTING PROCEDURE Document No.: SH1-HNC-P0100-C-C14-PRO-0001 (Onshore) Rev.: A No of Pages: 11 SONG HAU THERMAL POWER PLANT PROJECT (2X600MW) CONTENTS PROJECT INFORMATION OBJECTIVE OF THE PILE TESTS .4 TESTING TYPES 4 REFERENCE DOCUMENTS .4 4.1 Codes and Standards 4.2 Project Specifications and Drawings SUB-SOIL CONDITIONS TEST PILE INFORMATION TEST EQUIPMENT TESTING UNIT .5 STATIC AXIAL COMPRESSIVE LOAD TEST 9.1 TEST PURPOSE 9.2 TEST METHOD 9.2.1 Applied Standard 9.2.2 Test Principle 9.2.3 Requirement for carrying out the static axial compressive load test .6 9.3 TESTING EQUIPMENT 9.3.1 Equipment for loading .6 9.3.2 Counter-Weight 9.3.3 Settlement Measuring Instruments 9.4 TESTING PROCEDURE 10 STATIC AXIAL TENSILE LOAD TEST 10.1 TEST PURPOSE .6 10.2 TEST METHOD .7 10.2.1 Technical Specifications 10.2.2 Applied Standard 10.2.3 Requirement for carrying out the Static axial tensile load test 10.3 TEST EQUIPMENT 10.4 TESTING PROCEDURE 11 LATERAL LOAD TEST 11.1 TEST PURPOSE .7 11.2 TEST METHOD .7 11.2.1 Applied Standard 11.2.2 Test Principle 11.2.3 Requirement for carrying out the Lateral Load Test 11.3 TEST EQUIPMENT SH1-HNC-P0100-C-C14-PRO-0001 IN-SITU PILE TESTING PROCEDURE Page of 11 SONG HAU THERMAL POWER PLANT PROJECT (2X600MW) 11.4 TESTING PROCEDURE 12 LOW STRAIN IMPACT INTEGRITY TEST (PIT) 12.1 TEST PURPOSE .9 12.2 TEST METHOD .9 12.2.1 Applied Standard 12.2.2 Test principle 12.3 TESTING EQUIPMENT 12.4 TEST PROCEDURE .10 13 HIGH STRAIN DYNAMIC LOAD TEST (PDA) 10 13.1 TEST PURPOSE .10 13.2 TEST METHOD .10 13.2.1 Applied Standard 10 13.2.2 Test principle 10 13.3 TESTING EQUIPMENT 11 13.4 TEST PROCEDURE .11 SH1-HNC-P0100-C-C14-PRO-0001 IN-SITU PILE TESTING PROCEDURE Page of 11 SONG HAU THERMAL POWER PLANT PROJECT (2X600MW) PROJECT INFORMATION • Project: SONG HAU THERMAL POWER PLANT - TWO (2) X 600MW • Location: Mai Dam Town, Chau Thanh District, Hau Giang Province • Investor: PETROVIETNAM • EPC Construction: LILAMA JSC • Sub Construction: HANCORP OBJECTIVE OF THE PILE TESTS The main objectives of the initial pile test are to verify the design capacity (compressive, tensile and lateral) of the pile before commencing installation of working piles and to evaluate the quality of pile installation works TESTING TYPES - Static Axial Compressive Load Test - Static Axial Tensile Load Test - Lateral Load Test - High Strain Dynamic Load Test (PDA) - Low Strain impact integrity Test (PIT) REFERENCE DOCUMENTS 4.1 Codes and Standards - TCVN 9393:2012 Piles – Standard test method in situ for piles under axial compressive - ASTM D1143: Standard Test Methods for Deep Foundation Under Static Axial Compressive Load - ASTM D3689: Standard Test Method for Deep Foundation Under Static Axial Tensile Load - ASTM D3966: Standard Test Method for Deep Foundation Under Lateral Load - ASTM D4945: Standard Test Method for High Strain Dynamic Testing of Deep Foundations - ASTM D5882: Standard test method for Low strain impact integrity testing of deep foundation 4.2 Project Specifications and Drawings Request for Proposal Owner’s Technical requirement, Technical specification for civil, structural and architectural works SH1-HNC-P0100-C-C14-PRO-0001 IN-SITU PILE TESTING PROCEDURE Page of 11 SONG HAU THERMAL POWER PLANT PROJECT (2X600MW) SUB-SOIL CONDITIONS The information of sub-soil profile is referred to “1st Soil Investigation Report” which was carried out on June, 2015 After Soil Improvement Works finish and Post Soil Investigation carried out, the new soil condition should be considered in any piles calculation TEST PILE INFORMATION The test pile locations and numbers shall follow the technical requirement and be approved by the Owner/Consultant The details construction of test pile shall be updated in followed documents TEST EQUIPMENT Testing equipment which shall be used for pile testing should meet the requiprements indicated from above mentioned Standards TESTING UNIT Testing unit should be the specialized registered LASXD in pile testing field The approved LASXD should provide site organization and the testing engineers should have qualified certificate which provide by authority organization STATIC AXIAL COMPRESSIVE LOAD TEST 9.1 TEST PURPOSE The Static Axial Compressive Load Test will be carried out for determination of compressive bearing capacity as the base for working piles design 9.2 9.2.1 TEST METHOD Applied Standard Loading test will be complied with Technical Specifications: ASTM D1143 and TCVN 9393:2012 9.2.2 Test Principle The Static Axial Compressive Load Test shall be applied by static loading on axial direction for single pile so that the pile is settled down The testing load is controlled by hydraulic jack system with pressure gauges and counter-weight is created by a combination of steel beams and Jack-in pilling machine Data of load, time and settlement obtained from the test shall be the basis for analyzing of the relationship between load and settlement of pile and evaluation for pile compressive bearing capacity SH1-HNC-P0100-C-C14-PRO-0001 IN-SITU PILE TESTING PROCEDURE Page of 11 SONG HAU THERMAL POWER PLANT PROJECT (2X600MW) 9.2.3 Requirement for carrying out the static axial compressive load test - The test piles must be constructed in the same method and procedure applied for all piles in the stage of mass construction - Top elevation of pile head shall be higher than the ground about 15cm - The test shall be only commenced at least 07 days after finishing installation of the pile 9.3 TESTING EQUIPMENT 9.3.1 Equipment for loading Using hydraulic jacks with sufficient capacity connecting with hydraulic pump and pressure gauge, put directly on the top of test pile to create a load on pile’s centre 9.3.2 Counter-Weight The Counter – Weight is Jack-in Machine’s Self- weight and the steel blocks which are put over the Jack-in Machine The total weight of Jack-in machine and steel block should be more than 150% of maximum testing load 9.3.3 Settlement Measuring Instruments The settlement of PHC test pile shall be monitored by 04 dial gauges with 0.01mm precision and maximum stroke of 50mm They shall be fixed with the reference beams of steel stacks L50x50x2mm with 3.0m length This beam shall be set independently to the testing system by fixing them into steel bars L80mm in corners, these bars are embedded about 1.5 m into the ground, at adequate distance from the testing bored pile and cushions, in order to eliminate effects from displacement of piles and cushions on readings of the dial gauges Note: All testing equipment, jacks, gauges, etc shall be furnished by the Testing Unit and certificated by an authority organization 9.4 TESTING PROCEDURE The test piles shall be tested upto 200% of design load Test load on piles shall be applied with the hydraulic jack using a 25% load increment until reaching the specified Test Load At each load increment the test load shall be maintained until the rate of displacement is not greater than 0.25 mm per hour, measured over a period of at least 15 minutes but not greater than hours Upon reaching maximum testing load, the test load should be mantianed in 24 hours during which the displacement shall be less than 0.25mm for the last hours of the test Displacement observation shall be made following application of each load increment and recorded at intervals of ½ minutes, minute, minutes, minutes, minutes, 15 minutes, 30 minutes, hour and each hour thereafter 10 STATIC AXIAL TENSILE LOAD TEST 10.1 TEST PURPOSE The uplift load test will be carried out for determination of tensile bearing capacity of SH1-HNC-P0100-C-C14-PRO-0001 IN-SITU PILE TESTING PROCEDURE Page of 11 SONG HAU THERMAL POWER PLANT PROJECT (2X600MW) pile as the base for working piles design 10.2 TEST METHOD 10.2.1 Technical Specifications Tension load test will be complied with Technical Specifications: ASTM D3689: Standard Test Methods for Deep Foundation Under Static Axial Tensile Load; 10.2.2 Applied Standard The test is carried out by the application of an axial static tensile load to a pile so that the pile pulled up from the ground by mean of the hydraulic jack and counter force from Testing beam and supporting blocks Data of tensile load, time and displacement obtained from the test shall be the basis for analyzing of relationship between tensile load and displacement and evaluation of pile tensile bearing capacity 10.2.3 Requirement for carrying out the Static axial tensile load test - The test piles must be constructed in the same method and procedure applied for all piles in the stage of mass construction - Top elevation of pile head shall be higher than the ground at least 30cm - The static tensile load test shall be only commenced at least 07 days after finishing installation of the pile 10.3 TEST EQUIPMENT The equipment which shall be used for Tensile load test should meet the requipments indicated in ASTM D3689 and also need to meet requirement which presented in Static Axial Compressive Load Test part 10.4 TESTING PROCEDURE The test piles shall be tested upto 200% of design load The test load applying procedure following the same increment/decrement and requirements as statted for Static Axial Compressive Load Test The displacement observation and record keeping shall be same as stated for Static Axial Compressive Load Test 11 LATERAL LOAD TEST 11.1 TEST PURPOSE The lateral load test will be carried out for determination of lateral bearing capacity of piles in order to verify the design capacity of the pile 11.2 TEST METHOD 11.2.1 Applied Standard Loading test will be complied with Technical Specifications: ASTM D3966: Standard Test Method for Deep Foundation Under Lateral Load; SH1-HNC-P0100-C-C14-PRO-0001 IN-SITU PILE TESTING PROCEDURE Page of 11 SONG HAU THERMAL POWER PLANT PROJECT (2X600MW) 11.2.2 Test Principle The test is carried out by the application of a lateral static load to a pile so that the pile is moved laterally The lateral load is controlled by means of a hydraulic jacks and pump acting against a counter force system which is built beside the pile Data of load, time and pile’s head lateral displacement obtained from the test shall be the basis for analysing of the relationship between load and lateral displacement of pile and evaluation of pile/soil’s lateral bearing capacity 11.2.3 Requirement for carrying out the Lateral Load Test The test piles must be constructed in the same method and procedure applied for all piles in the stage of mass construction Top elevation of pile head shall be higher than the ground at-least 30 cm The static load test shall be only commenced at least 07 days after finishing installation of the pile 11.3 TEST EQUIPMENT The equipment which shall be used for Tensile load test should meet the requipments indicated in ASTM D3689 and also need to meet requirement which presented in Static Axial Compressive Load Test part 11.4 TESTING PROCEDURE Proposed testing procedure is presented in Table Table Testing procedure for Lateral Load Test Load step (% of Design Load) Remark Maintained in 10 minutes, checking equipments Take the initial reading 25 Maintained in 10 minutes 50 Ditto 75 Maintained in 15 minutes 100 Maintained in 20 minutes 125 Ditto 150 Ditto 170 Ditto 180 Ditto SH1-HNC-P0100-C-C14-PRO-0001 IN-SITU PILE TESTING PROCEDURE Page of 11 SONG HAU THERMAL POWER PLANT PROJECT (2X600MW) Load step (% of Design Load) Remark 190 Ditto 200 Maintained in 60 minutes 150 Maintained in 10 minutes 100 Ditto 50 Ditto Maintained in 30 minutes During loading and unloading, the readings of time, load and displacement of pile head shall be taken and recorded for every increment and decrement at 0, 5, 10, 15, 20, 30, 45, 60 12 LOW STRAIN IMPACT INTEGRITY TEST (PIT) 12.1 TEST PURPOSE The Low Strain Impact Integrity Test (PIT) will be carry out to evaluate the integrity of pile (change in pile physical dimensions (cross-sectional area, length), continuity, and consistency of the pile material 12.2 TEST METHOD 12.2.1 Applied Standard The PIT test shall be carry out according to ASTM D5882: Standard test method for Low strain impact integrity testing of deep foundation; 12.2.2 Test principle Pile Integrity Test performs the wave equation-based non-destructive test known as Pulse or Sonic Echo Test, or Low Strain Dynamic Test Low strain impact integrity testing provides acceleration or velocity data on slender structural elements (that is, structural columns, driven concrete piles, bored piles, concrete filled steel pipe piles, timber piles, etc.) The method works best on solid concrete sections, and has limited application to unfilled steel pipe piles, H piles, or steel sheet piles The test requires the impact of a small handheld hammer on the pile top and the measurement of the pile top motion (acceleration or velocity) The input compression wave from the hammer is reflected from pile toe (or a change in cross sectional area or pile material quality) and returns to the pile top at a time related to the wave speed which travel in the pile material 12.3 TESTING EQUIPMENT The PIT tests will be carried out with the Pile Integrity Tester PIT-V manufactured by Pile Dynamics, Inc The instrument complies with ASTM D5882 and at least has the SH1-HNC-P0100-C-C14-PRO-0001 IN-SITU PILE TESTING PROCEDURE Page of 11 SONG HAU THERMAL POWER PLANT PROJECT (2X600MW) following parameters: - One channels of acceleration data acquisition for measuring acceleration, velocity due to the impact of the hand held hammer to the pile top - 24 bit A/D converter; - Analog Signal Frequency response: 31kHz (-3dB) - Sampling Digitizing frequency of >1 MHz - Sampling speed of 64 kHz for normal pile testing (up to 128 KHz for shorter piles or floor slabs) - Capability of measuring and reproducing signals of duration between and 30 ms - Data can be averaged over a variable number of blows - Variable signal amplification over time 12.4 TEST PROCEDURE The test is carried out as follows: - Input information of test pile (pile name, diameter, pile length etc.) - Fix the accelerator on the center of fixing position - Tapping on the pile head near accelerator by the hammer with at least numbers of hammering for each location 13 HIGH STRAIN DYNAMIC LOAD TEST (PDA) 13.1 TEST PURPOSE The High Strain Dynamic Load Test (PDA) will be carry out to confirm the bearing capacity and the integrity of PHC pile also 13.2 TEST METHOD 13.2.1 Applied Standard The PDA test shall be carry out according to - ASTM D4945-12: Standard Test Method for High Strain Dynamic Testing of Deep Foundations; 13.2.2 Test principle PDA is performed by utilizing the one dimensional wave theory The compressive stress wave produced by the impact of the falling weight moves up and down the pile When the wave encounters soil resistance forces along the shaft or at the toe it assumes an opposite direction (a refection) These reflections travel upward along the shaft and arrive at the pile top at times that are related to their location along the shaft Base on measuring of stress wave during testing, the subsequent parameter such as pile capacity, load distribuition will be drawn out SH1-HNC-P0100-C-C14-PRO-0001 IN-SITU PILE TESTING PROCEDURE Page 10 of 11 SONG HAU THERMAL POWER PLANT PROJECT (2X600MW) 13.3 TESTING EQUIPMENT The testing equipment complies with the specifications as defines in ASTM D4945 The primary testing equipment is a free drop hammer with a minimum weight of 1% to 2% of the pile’s test load (TL) (ASTM D4945) To setting up the testing hammer and carry out the test, the suitable crane shall be used The secondary testing equipment consists of an Pile Driving Analyser which enables the collection of at least two sets of data for acceleration and strain at the same time 13.4 TEST PROCEDURE * At site Free dropping the hammer to impact on the pile head The sensors will receive the signals and transmit to the recorder and to the PAK for display PDA operator must always check the accuracy of the data and the homogeneity and balance during the test * Indoor Base on the site records, the Engineer will use the analysis software to evaluate the bearing capacity of pile CAWAP is the software analysis program that use the results of dynamic load test to the calculate the static load bearing capacity on pile (also side resistance and peak resistance), elastic modulus and soil viscosity, setting the relationship line between settlement and force of the pile CAPWAP program uses the results of actual measurement as the input for the analysis, typical factors of soil and pile are calculated during the rebuilt of theoretic model in accordance to the measurement results SH1-HNC-P0100-C-C14-PRO-0001 IN-SITU PILE TESTING PROCEDURE Page 11 of 11 ... Design Load) Remark Maintained in 10 minutes, checking equipments Take the initial reading 25 Maintained in 10 minutes 50 Ditto 75 Maintained in 15 minutes 100 Maintained in 20 minutes 125 Ditto 150... SH1-HNC-P0100-C-C14-PRO-0001 IN- SITU PILE TESTING PROCEDURE Page of 11 SONG HAU THERMAL POWER PLANT PROJECT (2X600MW) Load step (% of Design Load) Remark 190 Ditto 200 Maintained in 60 minutes 150 Maintained in 10 minutes... SH1-HNC-P0100-C-C14-PRO-0001 IN- SITU PILE TESTING PROCEDURE Page 10 of 11 SONG HAU THERMAL POWER PLANT PROJECT (2X600MW) 13.3 TESTING EQUIPMENT The testing equipment complies with the specifications as defines in ASTM