The Field Test Study And Numerical Analysis Of The Stress Performance Of SMW Construction Method Pile In Sandy Soil Area

With the continuous expansion and upgrading of urban ground transportation construction,the use space of floor space is becoming more and more saturated,so people began to turn the development of cities underground.And foundation pit engineering is the foundation of the construction of underground space,which the SMW pile as a new type of foundation pit retaining technology,with its environmental protection,economy,short time limit,the advantages of strong adaptability,widely followed,and SWM pile method in Shanghai,they are widely used in soft soil,clay areas such as research and more thorough.According to the literature review SMW construction method has less research on the application of sand soil area.Sand and soft soil,clay soil,the stress of the SMW pile is also different,so the article summarizes the research results at home and abroad,and combining with the engineering practice,through field test methods SWM pile in sandy soil areas under various conditions of various performance parameters were analysed and regularity are obtained.The main contents of this paper include the following aspects:1.Of various conditions in the process of foundation pit construction of three test steel stress measurement,according to the measurement results were collected for processing analysis,get three actual size by stress test section,test section at the same time,according to the principle of superposition of stress calculated by stress under the pure bending state.2.Based on the stress distribution of the test section under the condition of the pure bending state,the bending moment of three test steel sections under the pure bending state is calculated and the bending moment curves of the various working conditions are drawn.3.In this paper,the displacement results of the measured steel by theoretical calculation are compared with the displacement results measured by the measured pipe in the field,and the reliability of the test is analyzed.4.According to the assumption of the plain section,the actual stress size of the water soil under different working conditions is calculated and the crack depth of water soil is calculated.5.Using ABAQUS finite element software to simulate the process of foundation pit construction,analyzes the stress of SMW pile with deep horizontal displacement,etc.The calculation results,the theoretical calculated values and measured values,the value of finite element simulation of three were compared,and the reliability of the model are analyzed.