Evaluation method for hole collapse risk of foundation of cast-in-situ bored pile and application

Abstract

The invention discloses an evaluation method for a hole collapse risk of a foundation of a cast-in-situ bored pile and application. On the basis of the basic principle of a fuzzy mathematic theory, the method is a fuzzy synthetic evaluation method for carrying out analysis and evaluation on the stability of a hole wall of the cast-in-situ bored pile and the hole collapse risk through multiple-factor analysis and evaluation. The fuzzy evaluation method not only evaluates and sorts evaluation objects according to the comprehensive scores, but evaluates the order of evaluation of the evaluation objects according to values on a fuzzy evaluation set and a maximum membership principle. The method overcomes the defect of oneness of a result of the conventional mathematical method, and the result contains abundant information quantity. The method is simple and feasible, and as for problems which cannot be subjected to number analysis from some traditional views, the problems of fuzziness and uncertainty of stability evaluation of many projects can be well solved.

Description

technical field [0001] The invention relates to the field of analysis, evaluation and prevention of bored pile hole wall stability, in particular to an evaluation method and application of bored pile foundation collapse risk. Background technique [0002] Weak cohesive soil layers of marine, lacustrine, and river deposits are widely distributed in the southeastern coastal areas of China. The characteristics of this type of soil are high water content, low strength, high compressibility, poor water permeability, and deep burial. There will be considerable settlement and settlement difference, and its bearing capacity and stability often cannot meet the engineering requirements. Therefore, cast-in-place piles have become a common way of foundation treatment in this area. However, the instability of the hole wall of bored piles is a major engineering problem that commonly exists in the construction process of bored piles and has been plagued by major engineering problems. If th...

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Problems solved by technology

However, this method needs to be based on a lot of assumptions and it is difficult to take qualitative factors into consideration; the second is to use finite element software to simulate and analyze various factors that affect the stability of the hole wall, and qualitatively identify the borehole perfusion. The stability of the pile hole wall, and according to the influencing factors of the hole wall stability, control measures are proposed

However, this method is only aimed at the analysis of the factors affecting the collapse of the hole wall in the specified project or area and the evaluation of the stability, and cannot obtain a unified analysis method, which is difficult to promote and use, and has certain limitations; Data analysis and evaluation of a single collapse factor

The disadvantage of this type of method is that it can only model and analyze the quantitative collapse factors, and cannot comprehensively analyze and evaluate the qualitative collapse factors, and cannot objectively, comprehensively and accurately evaluate the stability of the bored pile construction hole wall in the engineering area. The comprehensive analysis and evaluation of the risk of hole collapse and the risk of bored piles have limitations in the guidance of the prevention and control of the hole collapse of bored piles

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