Study On The Influence Of Surrounding Environment Of Deep Excavation In Soft Soil Area

The prediction of ground settlement curve around the deep foundation pit in soft soil area has a lot of kinds of methods, with application of semi empirical method, numerical analysis method is the most widely.Because of the foundation pit engineering involves complex soil conditions and groundwater conditions, Pit size and supporting have a variety of forms. The combined effects of various unfavorable factors, resulting in several methods in predicting ground settlement around the foundationExhibits low applicability,complex calculations and predictions inaccurate phenomena. Therefore the study on settlement prediction analysis and surface deformation deep foundation pit engineering in soft soil area is very necessary.Many factors influence the deep foundation pit deformation in soft soil area, Including excavation depth, supporting forms, pull anchor structural arrangement, soil conditions, groundwater conditions and a variety of additional load. Considering the influencing factors under the premise of conventional, by using engineering example of the field monitoring data and finite element numerical simulation methods. Analysis of spatial variation of the effect of deformation in Foundation Pit, proposed the use of deep ground displacement level field monitoring and pile internal force cumulative change value estimation method of ground settlement around foundation, and validated by its estimated result.According to the above problems, this paper focuses on the following issues have been studied:1.Combined with the engineering example of a deep foundation pit in Yingkou, pile top displacement, ground surface settlement and horizontal displacement of deep soil and other monitoring data processing field obtained, by comparing the deformation law of foundation pit engineering,I have analyzed the depth of excavation, support form, cable layout and other factors on the impact of various types of deformation.According to the displacement change data of different monitoring points corresponding to the same side wall, I analyze the effect of spatial effects on the structure and the soil deformation2. I use the finite element analysis software Midas, combining with engineering examples, introduces the application of technique of deep foundation pit engineering in numerical simulation and parameter selection of experience. I simulate the deformation size during the excavation of a deep foundation pit in Yingkou engineering calculation, analysis of spatial effect of deformation of foundation pit production condition and the influence scope, grasp the deep horizontal displacement variation law of foundation pit supporting structure corresponding to each position, variation of deformation in different time periods of supporting structure and surrounding soil accumulation.3. I have analyzed soil variation of strain in different regions of the deformation of foundation pit support lateral soil retaining wall, I put the deformation zone and elastic deformation zone after the wall (plastic surface settlement effective area) dividing grid unit. The use of deep ground displacement level field monitoring and pile internal force changes in accumulation of value estimation method is derived, the surface settlement around the foundation pit.4. A deep foundation pit engineering as the research background, I use the deep ground displacement level field monitoring and pile internal force changes in accumulation of value estimation of surface settlement around foundation pit curve.Comparison of estimation results with other methods of surface settlement prediction results and field monitoring data,I analyzed the reasonableness of calculated results.