Liquefaction discrimination method and system combining static sounding and shear wave velocity test

Abstract

The invention relates to the field of foundation soil site category discrimination in geotechnical engineering investigation and building earthquake resistance, in particular to a liquefaction discrimination method and system combining static sounding and shear wave velocity testing, and the method comprises the following steps: creating an initial database; matching the shear wave velocity of the sandy soil by using the initial database so as to perfect the initial database to obtain a complete database; defining an interpretation variable according to the complete database, establishing an initial liquefaction probability model, and perfecting the initial liquefaction probability model by using the interpretation variable so as to obtain a liquefaction probability calculation formula; carrying out deformation solution on the liquefaction probability calculation formula to obtain a liquefaction resistance ratio formula; and obtaining a liquefaction judgment result of the sandy soil by utilizing the liquefaction resistance ratio formula and combining the liquefaction stress ratio. According to the method, static sounding and shear wave velocity testing are combined, the mechanical response of the soil body can be accurately and comprehensively reflected on the basis of the advantage complementation principle, and liquefaction judgment is accurately carried out.

Description

technical field [0001] The invention relates to the field of foundation soil site category discrimination in geotechnical engineering investigation and building anti-seismic, in particular to a liquefaction discrimination method and system for joint static penetration and shear wave velocity testing. Background technique [0002] Earthquake-induced soil liquefaction often leads to uneven settlement of building foundations, which is one of the main causes of foundation damage. Therefore, effective discrimination of saturated soil liquefaction is an important content in geotechnical seismic investigation. Generally, the identification methods of saturated soil liquefaction can be divided into two categories: indoor test and in-situ test. In-situ testing technology is widely used in the field of liquefaction discrimination due to its advantages of fast, non-disturbance, and economy. As the most important in-situ testing technology, static penetrating testing (CPT) has become ...

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Problems solved by technology

The invention solves the problems of single test, inaccuracy, inability to take into account the comprehensive corresponding characteristics of soil strength and stiffness in the existing static penetration test or shear wave velocity test liquefaction discrimination method, and the range of test soil is small. Penetration testing and shear wave velocity testing, based on the principle of complementary advantages, propose a liquefaction discrimination method using two soil parameters, which can accurately and comprehensively reflect the mechanical response of the soil, accurately perform liquefaction discrimination, and provide powerful detection for geotechnical engineering investigation practice method

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