Inverse analysis method for determining pile foundation and pile soil strength parameters

Abstract

The invention discloses an inverse analysis method for determining pile foundation and pile soil strength parameters and belongs to the technical field of civil engineering. The method includes a pile side soil strength parameter inverse analysis method and a pile end soil strength parameter inverse analysis method, namely a determining method of the pile side soil and pile end soil elastic mechanics solution, a pile side soil stress transmission attenuation coefficient, the principal stress difference saltation principle for determining the pile side soil limit equilibrium state position and a stress path saltation point, an Mohr stress circle graphic method for determining the pile side soil strength parameter and an Mohr stress circle graphic method for determining the pile end soil strength parameter. The inverse analysis method is established on the basis of the elastic theory, the rock and soil mechanics theory and the saltation theory, the acquired strength parameters are closer to the objective situation, the method has higher applicability, and the errors caused by test contingency factors are reduced.

Description

technical field [0001] The invention belongs to the technical field of civil engineering, and in particular relates to a back analysis method for determining soil strength parameters around pile foundation piles. Background technique [0002] The bearing capacity of the pile foundation mainly depends on the ultimate bearing capacity of the soil around the pile. The strength of the soil is mainly reflected in the shear strength. Therefore, the shear strength index of the soil is the main factor determining the bearing capacity of the pile foundation. The strength parameters of the soil include cohesion c and internal friction angle , at present, these two parameters are usually obtained through geotechnical tests. Because geotechnical tests need to separate the sample from its working environment, and cannot accurately simulate the fracture surface of the soil under real working conditions, the strength parameters obtained by geotechnical tests have Due to large errors, dom...

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Problems solved by technology

[0002] The bearing capacity of the pile foundation mainly depends on the ultimate bearing capacity of the soil around the pile. The strength of the soil is mainly reflected in the shear strength. Therefore, the shear strength index of the soil is the main factor determining the bearing capacity of the pile foundation. The strength parameters of the soil include cohesion c and internal friction angle , at present, these two parameters are usually obtained through geotechnical tests. Because geotechnical tests need to separate the sample from its working environment, and cannot accurately simulate the fracture surface of the soil under real working conditions, the strength parameters obtained by geotechnical tests have Due to large errors, experts at home and abroad simulated the real working state of the soil through a series of improved tests, but still failed to fully achieve the expected goal

[0003] At present, the vertical static load test of the pile foundation is a method that must be adopted in the existing methods for determining the bearing capacity of a single pile, and the geotechnical compression test is a relatively reliable means to determine the soil strength parameters; It will inevitably lead to changes in the properties such as the compactness of the soil, which will affect the determination of the strength parameters, thereby reducing the reliability and availability of the strength parameters measured by the test; the existing in-situ tests cannot simulate the load on the pile The real fracture surface of the soil under certain conditions, and the simple vertical static load test of the pile foundation cannot directly measure the strength parameters of the soil; therefore, it is difficult to determine the strength parameters of the soil through a simple test method

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