LUẬN văn THẠC sĩ minimizing influence on existing buildings when tunneling in soft soil

VIETNAM NATIONAL UNIVERSITY, HANOI VIETNAM JAPAN UNIVERSITY TRAN QUANG DUC MINIMIZING THE INFLUENCE ON EXISTING BUILDINGS WHEN TUNNELING IN SOFT SOIL LUAN VAN CHAT LUONG download : add luanvanchat@agmail.com VIETNAM NATIONAL UNIVERSITY, HANOI VIETNAM JAPAN UNIVERSITY TRAN QUANG DUC MINIMIZING THE INFLUENCE ON EXISTING BUILDINGS WHEN TUNNELING IN SOFT SOIL MAJOR: MASTER OF INFRASTRUCTURE ENGINEER CODE: ………………… RESEARCH SUPERVISOR: Dr NGUYEN TIEN DUNG Dr VU MINH NGAN Hanoi, 2019 LUAN VAN CHAT LUONG download : add luanvanchat@agmail.com ACKNOWLEDGEMENT LUAN VAN CHAT LUONG download : add luanvanchat@agmail.com ABTRACT LUAN VAN CHAT LUONG download : add luanvanchat@agmail.com CONTENT ACKNOWLEDGEMENT ABTRACT CHAPTER I INTRODUCTION 1.1 Background 1.2 Outline research 10 CHAPTER LITERATURE REVIEW 11 2.1 Empirical method 11 2.2 Analytical methods 13 2.3 Finite element method using software Plaxis 2D 13 CHAPTER METHODOLOGY 15 3.1 General 15 3.2 Project case study 16 3.2.1 Main properties of Tunnel in HCM MRT line1 17 3.2.2 Construction sequence of underground tunnel 17 3.3 Collection of soil condition data 18 3.3.1 Soil investigation data 18 3.3.2 Groundwater data 20 3.4 Collection of TBM’s operation data 21 3.5 Selection of analysis section 21 3.6 Ground settlement analysis by empirical method 22 3.7 Numerical analysis with Plaxis 2D 23 3.7.1 Mesh model 23 LUAN VAN CHAT LUONG download : add luanvanchat@agmail.com 3.7.2 Preparation input data 24 3.7.3 Soil input parameters in Plaxis 2D 28 3.7.4 Properties of tunnel segment 28 3.7.5 Water condition 28 3.7.6 Contraction method 28 3.7.7 Stress reduction method 29 3.8 Collection of monitoring data 30 CHAPTER RESULT AND DISCUSSION 33 Ground surface settlement of the tunnel alignment 33 4.1.1 Ground surface settlement of the tunnel alignment 33 4.1.2 Ground surface settlement in tunneling period 34 4.2 TBM’s operational parameters and its effect on settlement 35 4.3 Analysis of ground surface settlement by Empirical method 37 4.3.1 Trough width parameter (i) 39 4.3.2 Volume loss (VL) 39 4.4 Analysis of ground surface settlement by Plaxis 2D 40 4.4.1Contraction method 40 4.4.2 Stress reduction method 42 4.5 Comparisons of empirical method and numerical method 43 CHAPTER 55 45 CONCLUSIONS AND RECOMMENDATIONS 45 Conclusions 45 5.2 Recommendations 46 LUAN VAN CHAT LUONG download : add luanvanchat@agmail.com REFERENCES 47 FIGURE 52 APENDIX A: TUNNEL MACHINE AND LINNING SEGMENT 67 APENDIX B: GEOLOGY PROFILE 70 APPENDIX C: CROSS BUILDING STRUCTURE 73 LUAN VAN CHAT LUONG download : add luanvanchat@agmail.com CHAPTER I INTRODUCTION 1.1 Background In Vietnam, big cities such as Hanoi and Ho Chi Minh have reached approximately 10 million population, not including the sub-urban people residing and commuting due to the recent rapid urbanization This creates a dramatically pressure on the infrastructure system and the public transport system Construction of MRT with underground sections is the optimal and feasible solution to solve these problems of the cities Figure System map (planned) for Hanoi MRT system to vision 2050 (Hanoi Metropolitan Railway Management Board) LUAN VAN CHAT LUONG download : add luanvanchat@agmail.com Figure System map (planned) for Hochiminh city MRT system to vision after 2020 (HCMC urban railway management board) In bored tunel in urban areas, bored tunel with TBMs has recently been a popular and effective method in the world This technique has been developed and applied as a main method for underground MRT projects The two cities of Hanoi and Ho Chi Minh City are located at the center of the delta with geology condition a mostly consisted of soft soil Deformations including settlements and tilts should be well controlled when bored tunnel in order to protect the existing ground surface and minimize the impacts on existing structures By combining theoretical calculation, software analysis and comparison with monitoring data, results derived from this study can be applied for the bored tunnel design and construction in LUAN VAN CHAT LUONG download : add luanvanchat@agmail.com geo-conditions in Vietnam in order to obtain effective and safe bored tunnel projects 1.2 Outline research There are five chapters in this thesis Chapter is the introduction presenting the background of bored tunnel work and outline of the thesis Reviewing the theoretical to calculate the displacement of existing structures during and after the TBM drilling process is indicated in Chapter Chapter shows the displacement calculation carried out by finite element method to predict the degree of influence on existing works as well as the optimal efficiency Chapter describes a comparison between theoretical and numerical results with monitoring data in case study in Ho Chi Minh City Metroline project to verify methods of predicting settlement displacement Proposing solutions based on calculated and observed results has been derived in Chapter 10 LUAN VAN CHAT LUONG download : add luanvanchat@agmail.com Figure4.8 Figure4.8 61 LUAN VAN CHAT LUONG download : add luanvanchat@agmail.com Figure4.9 62 LUAN VAN CHAT LUONG download : add luanvanchat@agmail.com Figure4.9 Figure4.9 63 LUAN VAN CHAT LUONG download : add luanvanchat@agmail.com Figure4.9 Figure4.9 64 LUAN VAN CHAT LUONG download : add luanvanchat@agmail.com Figure4.9 Figure4.9 Figure4.9 65 LUAN VAN CHAT LUONG download : add luanvanchat@agmail.com Figure4.9 66 LUAN VAN CHAT LUONG download : add luanvanchat@agmail.com APENDIX A: TUNNEL MACHINE AND LINNING SEGMENT 67 LUAN VAN CHAT LUONG download : add luanvanchat@agmail.com 68 LUAN VAN CHAT LUONG download : add luanvanchat@agmail.com 69 LUAN VAN CHAT LUONG download : add luanvanchat@agmail.com APENDIX B: GEOLOGY PROFILE 70 LUAN VAN CHAT LUONG download : add luanvanchat@agmail.com 71 LUAN VAN CHAT LUONG download : add luanvanchat@agmail.com 72 LUAN VAN CHAT LUONG download : add luanvanchat@agmail.com APPENDIX C: CROSS BUILDING STRUCTURE Figure Building cross section along of tunnel alignment from CH 0+940;CH 0+ 966; CH 1+033; CH 1+860 73 LUAN VAN CHAT LUONG download : add luanvanchat@agmail.com Figure Building cross section along of tunnel alignment CH 1+161; CH 1+524;CH 1+235;CH 1+400 74 LUAN VAN CHAT LUONG download : add luanvanchat@agmail.com 75 LUAN VAN CHAT LUONG download : add luanvanchat@agmail.com ...VIETNAM NATIONAL UNIVERSITY, HANOI VIETNAM JAPAN UNIVERSITY TRAN QUANG DUC MINIMIZING THE INFLUENCE ON EXISTING BUILDINGS WHEN TUNNELING IN SOFT SOIL MAJOR: MASTER OF INFRASTRUCTURE ENGINEER CODE:... remaining section It is necessary for mitigation influence of settlement on existing building Should using jet-grouting, strictly monitoring and prepared planning adaption to prevent incident in. .. tunnel in order to protect the existing ground surface and minimize the impacts on existing structures By combining theoretical calculation, software analysis and comparison with monitoring data,