Method for solving solution of elastic foundation beams and for back analysis of value m

Abstract

The invention provides a method for solving solution of elastic foundation beams and for back analysis of value m, belonging to the technical field of geotechnical engineering. The method comprises the following steps of: 1, firstly, converting a fourth order partial differential equation of the elastic foundation beam into a low order partial differential equation set, and setting iteration times and admissible errors; 1, taking a minimum error function of a displacement value sol.y obtained in the step one and an actually-measured displacement value as an objective function, wherein the minimum error function is the sum of squares of difference values; 3, optimizing the objective function in the second step by the application of MATLAB nonlinear optimization algorithm fmincon functions, when reaching the iteration times or the admissible errors set in the first step, stopping iteration, and in this case, the objective function reaching the minimum value; and 4, the parameters corresponding to the minimum value of the objective function being the optimum solution of horizontal resistance factor value m of the to-be-determined soil layer foundation soil. The method provided by the invention is simple in analysis process and easy for programming.

Description

[0001] technical field [0002] The invention relates to a method for solving and m-value back analysis of elastic foundation beams, and belongs to the technical field of geotechnical engineering. [0003] Background technique [0004] With the development of high-rise buildings and urban underground spaces in our country, the scale and quantity of foundation pit projects are constantly expanding. At the same time, deep and large foundation pits also put forward higher requirements for the design of supporting structures. Since urban deep and large foundation pits are usually located in prime locations in the city, the support design must not only ensure the safety and stability of the foundation pit itself, but also effectively control the deformation of the foundation pit to protect the safety of the surrounding building environment. Traditionally, strength control design is the key The main way is gradually replaced by the main way of deformation control design. The ela...

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Problems solved by technology

The single pile horizontal load test method is based on the single pile horizontal load test method. In fact, it borrows the method of determining the m value used to calculate the pile horizontal bearing capacity in civil engineering, and calculates the m value based on the static load test results. However, this method has the following main Problems: ① There are few chances to use it, and there are very few opportunities to conduct a single pile horizontal static load test for a specific foundation pit project; ② The displacement of the pile top is unreasonable

The programming of the finite element method of the forward analysis rod system is complicated, and how to call the forward analysis of the reverse analysis simplex method is also a problem that has not been well solved

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