Method for measuring drilling hole shrinkage layer positions of soft soil layers and influence factors

Abstract

The invention relates to a method for measuring drilling hole shrinkage layer positions of soft soil layers and influence factors and belongs to the field of prevention and treatment of shrinkage deformation of hole walls of foundation drilling and grouting piles. The method is characterized by determining drilling hole wall shrinkage testing and drilling geometric elements, drilling hole wall shrinkage rate reference evaluation parameters, different soil layer shrinkage deformation rates and main and secondary shrinkage deformation layer positions, drilling and grouting pile hole wall shrinkage influence factors, a shrinkage deformation influence factor initialization decision matrix, a shrinkage deformation influence factor standardization decision matrix, shrinkage deformation influence factor grey relational coefficient, and main, secondary and non-significant factors of hole wall shrinkage deformation. The method has the beneficial effects that the problem of mutual transformation of multiple correlations between the factors is solved by analysis of hole wall shrinkage influence factor grey correlation, a method for comprehensively analyzing, determining and evaluating the influence and the effect size of different drilling hole shrinkage prevention and treatment factors by using the correlation degree is provided, and the method has important practical values for analyzing and evaluating the drilling hole shrinkage prevention and treatment factors of the grouting piles.

Description

technical field [0001] The invention relates to the field of prevention and control of borehole wall shrinkage and deformation of bored piles on soft soil foundations, in particular to a method for measuring the shrinkage level of boreholes in soft soil layers and influencing factors. Background technique [0002] In my country's Yangtze River, Pearl River Delta and other coastal areas, there are widely distributed marine, lacustrine and fluvial deposits of sticky soft soil and silty soil layers, which have high water content, low strength, high compressibility, poor water permeability and deep burial. Due to the characteristics of soil, it will produce great settlement and settlement difference under the action of load, and its bearing capacity and stability often cannot meet the engineering requirements. Therefore, bored piles have become the most commonly used and most effective foundation reinforcement for foundation treatment in this area. measure. However, the hole wall...

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Problems solved by technology

Since this type of method cannot analyze and evaluate the qualitative hole wall shrinkage prevention and control factors, there is a gap between the obtained model and the actual situation, resulting in a large error between the quantitative index and the actual situation, and different results will be obtained by using different statistical processing methods , the prediction effect is often unsatisfactory, which affects the further treatment of bored pile hole wall shrinkage; the third is to use finite element software to simulate and analyze various factors that affect the stability of the hole wall, and qualitatively distinguish the hole wall of bored piles. However, this method is only aimed at the analysis of the factors affecting the borehole diameter reduction 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

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