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Phân tích ổn định tường vây trong hố đào sâu được gia cường bằng cọc xi măng đất

Nghiên cứu trình bày phương pháp bố trí cọc xi măng đất tối ưu giúp tăng cường ổn định công trình, giảm chuyển vị cũng như độ võng của tường. Đầu tiên, phương pháp Plaxis 3D được thực hiện để mô phỏng và phân tích việc thực hiện cọc trong Dự án Song - San nằm ở khu vực K1 của lưu vực Đài Bắc. Mời các bạn cùng tham khảo! | PHÂN TÍCH ỔN ĐỊNH TƯỜNG VÂY TRONG HỐ ĐÀO SÂU ĐƯỢC GIA CƯỜNG BẰNG CỌC XI MĂNG ĐẤT LÊ ĐỨC LINH LÊ BÁ VINH NGUYỄN NHỰT NHỨT Analysis stability of deep excavation reinforced by cement piled 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. The study presents the optmal method of arranging the soil cement piles that helps to enhance the construction stability reduce the displacement as well as the wall deflections. First Plaxis 3D method is carried out to simulate and analysise the piles implementation in Song - San Project located in the K1 area of the Taipei Basin. In there the soil cement piles are placed in a triangular grid for improving the soft clay to stabilize the wall and to prevent the sludge protruding out of pits. Next the piles arrangements with different places are caculated compare and evaluate. Results show that the plans for the arrangement of soil cement piles in single-wall strip PA2 and the arrangement of soil cement piles by block PA4 presenting in a horizontal displacement of 20 -22 compared with the arrangement of soil cement piles in a triangular grid effectively controlling the horizontal displacement of the diaphragm wall. The value of internal force in the wall is significantly reduced including torque reduction of about 23 and reduction force of about 22 compared to the arrangement of soil cement piles according to the triangular grid PA1 . This shows that in the construction of deep excavation pits in areas with weak geological foundation it is necessary to use soil cement piles to reinforce the foundation under the excavated pit bottom and at the same time choose the solution of arranging soil cement piles according to the wall or in blocks in direct contact and perpendicular to the diaphragm .