The Measurement Analysis And Numerical Simulation Of Diaphragm Wall Supporting

Foundation pit engineering is a very complex systematic engineering. With the development of social economy and urban construction, the quantity of deep foundation pit engineering rapidly increases, meanwhile, there are also many problems about the safety of foundation pit engineering and environmente. The development of deep foundation pit engineering is the result of interaction between theory and practice. The construction monitoring of deep foundation pit engineering is one of the necessary conditions to guarantee the safety and stability of deep foundation pit engineering, meanwhile, it is very important to summarize and analyze monitoring data in order to accumulate experience and perfect theory.The JiNan LvDi Puli Center is the first example of foundation pit engineering in JiNan which use the diaphragm wall and pre-stressed cable as the supporting structure. Based on this foundation pit engineering, this paper summarizes and analyze the monitoring data, and compares with the calculation results and numerical simulation results, in order to found out the rule of this supporting structure, and these work can provide a reference for similar foundation pit engineering.The principal results are as follows:(1) In the measured results, the maximum displacement of the diaphragm wall appears on the top of the diaphragm wall. The maximum bending moment of diaphragm wall appears on the top of the lowest foundation pit, and it is close to the bottom of foundation pit.After the excavation of foundation pit is finished, the displacement and bending moment of diaphragm wall, anchor tension continue to change.The displacement and bending moment of diaphragm wall are affected by anchor prestress, and the displacement of diaphragm wall is also affected by soil situation, surrounding buildings, the embedded depth of diaphragm wall, boundary conditions, soil effect.(2) In the calculation results show the maximum displacement is near top of the diaphragm wall.(3) In the numerical simulation results show the maximum displacement is near top of the diaphragm wall. On the whole, the maximum displacement lies in the middle of diaphragm wall, and the minimum displacement lies in the corner of diaphragm wall, and the displacement of the longitudinal direction is larger than the short side direction’s. The maximum anchor tensile force lies in the middle of diaphragm wall, and the minimum anchor tensile lies in the corner of diaphragm wall.The numerical simulation results of the displacement of diaphragm wall and anchor tension are close to reality, the incremental method results of the displacement of diaphragm wall and anchor tension are the largest between the measured results and the calculation results and the incremental method results. The incremental method result of the bending moment of diaphragm wall is lager than the elastic method results.Under the numerical simulation, the displacement of diaphragm wall is significantly affected by the elastic modulus and Poisson’s ratio.