The Research On The Application Of SMW Engineering Method On Some Deep Foundation

In some complex foundation of engineering geological environment, especially insome cases of some soft, moisture and other harsh geological environment, thepossibility of instability in foundation pit will greatly increase and the difficulty andthe requirement will be also higher in the retaining and protection of foundationexcavation. In the contrast of numerous supporting forms, SMW（Soil Mixing Wall）engineering method can be better applied and more practical in the projects of poorgeological conditions, the effect of the method is pretty good. As a technology, theresearch on the application of SMW engineering Method in the particular pit candeepen our further understanding of the application and can better guide the designand construction of SMW engineering method in some similar project，which hasgood practical effect. The research will help improve the overall safety and reduce thecosts as much as possible, what’s more, which improve the country’s constructionenvironment and the safety and the optimization of engineering economy to someextent.The main research contents and conclusions of the paper include the followingaspects:(1) The characteristics, mechanism of action and the design of the SMWengineering method pile are decrypted, the force and deformation mechanism aresummarized by a certain degree, at the same time, the factors effecting the stability ofthe SMW method pile is analyzed. The corresponding optimization measures areproposed.(2) The fuzzy analytic hierarchy process is used to select the retaining andprotection of foundation excavation in some certain foundation pit. Throughtheoretical analysis on the retaining and protection of foundation excavation of theproject, using the method of fuzzy analytic hierarchy process, for the three options,four major factors and9small levels of factor are analyzed, establishingcomprehensive evaluation program level model. Combining theoretical calculationsand practical engineering solutions, we can draw that the preferred decisionevaluation model is feasible. Scoring through relevant factors, combined with therelative priority factor for program membership and weight, using the analyticalmethod of fuzzy mathematics to calculate the value of a comprehensive quantitativeevaluation index to arrive at the third option (SMW method) is the optimal solution. (3) The ANSYS software has been used to analyze for a particular model. Thetime and location of maximum stress and deformation appearing has been analyzed.The theoretical research, ANSYS simulation results and the actual project data ofrelated conditions are contrastive analyzed to verify the rationality the maximumstress and maximum deformation appears. The simulation results in the stepexcavation support of SMW engineering method shows that the possibility of damageduring these time is lager compared with the previous period in adding the secondchannel excavation bottom, where the maximum damage position is located in thelower part of the excavation face, the possibility of the uplift of the bottom pit willoccur easily. When there is the crown beam, the position of fissures may be1.5mfrom outside, from the upper to the bottom of the pit, the displacement turns large atfirst and then turns small. The maximum displacement lies near the middle-upperposition of pit...