Luận văn thạc sĩ Địa kỹ thuật xây dựng: Nghiên cứu ứng xử của hệ thống vây-móng bè cọc trên nền gia cố bằng cọc xi măng đất

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ABSTRACT

Method of using the soil cement piles in order to increase the resistance, soil intensity of ground final layer which is constructed below for preventing basal heave instability, controlling wall deflections and reducing the strut loads for braced excavations in deep deposits of soft clay However, choose the solution of arranging soil cement piles according to the wall or in blocks in direct contact and perpendicular to the diaphragm wall to increase the building stability

In designing the piled raft foundations for civil engineering having more than two floors, load capacity of the raft and the diaphragm wall in vertical direction should be studied in order to arrange the number of piles under the raft foundation optimally and economically In this thesis, the involvement of the diaphragm wall system together with the piled raft foundation was analyzed and evaluated by the PLAXIS 3D software for specific projects With the solution of diaphragm walls ± piled raft foundation reinforced by soil cement columns, the percentage of the load

on the raft is about 27%, on the diaphragm walls is approximate 13% and on the piles group is 60% Diaphragm walls and piled raft foundation jointly share the load of the construction; at that time, the functions of the raft are to enhance the sustainability and the internal forces of the diaphragm walls; concurrently the diaphragm walls have the same influence to the raft and help to increase the raft load The effect of diaphragm walls is siginicant in the load distribution of the pile group, especially load of piles being nearby the diaphragm walls can decrease from 21% to 33%

Therefore, the number of piles could be declined and help to rearrange the internal force in raft foundation, diaphragm walls and pile group when comparing with traditional methods However, in the calculating and designing the diaphragm walls ± piled raft foundation reinforced by soil cement columns, the ability of compression, bending, and shear of raft foundation and diaphragm walls should be tested It means, the general designed solutions of the diaphragm walls ± piled raft foundation reinforced by soil cement columns need to be carried out in order to ensure the construction safety

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HìnK6͹WUuQKEj\ÿ˯QJL̫QFͯDP͡WPyQJbè F͕F (Poulos, 2001) 23

+uQKĈ͛WK͓ÿ˯QJL̫QY͉W̫LWU͕QJ- ÿ͡O~QFKRSKkQWtFKV˯E͡3RXORV 25

+uQK.KiLQL͏PWKL͇WN͇ÿ˯QJL̫Q%XUODQG¶V 27

+uQK6͹WUuQKEj\Y̭Qÿ͉FͯDGãy F͕FYͣLSKkQWtFK*$633RXORV1991)[11] 28

+uQK0{KuQKKyDPyQJF͕FÿjLEq&ODQF\HWDO >@ 30

Hình 3.1 (a) B͙ WUtWKHRO˱ͣi tam giác; (b) b͙ WUtWKHRKjQJÿ˯Q (c) b͙ trí theo ô cͥ; (d) b͙ trí theo kh͙i 31

Hình 3.2 3K˱˯QJiQF̫i thi͏n n͉n trong h͙ ÿjRVkXE̹ng c͕F[LPăQJÿ̭t 31

+uQK0͙LW˱˯QJTXDQJLͷDK͏V͙DQWRjQFK͙QJWU͛Lÿi\ÿ͡FͱQJFͯDW˱ͥQJYk\YjK͏ WK͙QJ FK͙QJ ÿͩ YͣL FKX\͋Q Y͓ QJDQJ OͣQ QK̭W FͯD W˱ͥQJ Yk\ (,Jw h 4 avg