A Method of Calculating the Structural Disturbance Degree of Soft Soil Using the Variation of Shear Modulus

A shear modulus and structural technology, which is applied in the direction of analyzing solids, analyzing materials, and instruments using sound waves/ultrasonic waves/infrasonic waves, to achieve the effects of correctly evaluating soil structural disturbances and accurately quantifying the strength of soil structures

Active Publication Date: 2018-12-14
ZHEJIANG UNIV
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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for calculating the structural disturbance degree of soft soil by using the change of shear modulus in view of the shortcomings of the existing method for calculating the degree of soil structural disturbance caused by the sampling process, so as to realize the use of stress normalization. Calculation of the soil structural disturbance caused by the sampling process using the normalized small-strain shear modulus index

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  • A Method of Calculating the Structural Disturbance Degree of Soft Soil Using the Variation of Shear Modulus
  • A Method of Calculating the Structural Disturbance Degree of Soft Soil Using the Variation of Shear Modulus
  • A Method of Calculating the Structural Disturbance Degree of Soft Soil Using the Variation of Shear Modulus

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Embodiment Construction

[0048] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0049] This example is an on-site survey of a subway foundation pit construction. The physical and mechanical properties of the soil are evaluated through indoor tests after the on-site drilling and sampling. Therefore, the quality of the drilling sampling is high, and the sampling process must be sufficient for the structural disturbance of the soil. Small. The method of the invention is used to calculate the structural disturbance degree of the soil during the sampling process.

[0050] The specific implementation steps of the inventive method are as follows:

[0051] (1) Before sampling, the cross-hole method is used to conduct in-situ shear wave velocity test at the proposed sampling site, and the in-situ shear wave velocity V before sampling disturbance at different depths of the site is obtained s0 ( figure 2 ), it should be noted th...

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Abstract

The invention discloses a method for calculating a structural disturbance degree of soft soil by utilizing changes of shear modulus. The method comprises the following steps: before sampling, carrying out field in-situ shear wave velocity testing to obtain an in-situ shear wave velocity; taking soil samples with different depths and marking; testing the obtained soil samples with different depths by utilizing a bending element shear wave velocity testing device respectively after stress of the soil samples is released and the soil samples are remolded so as to obtain a shear wave velocity under a stress-free state after sampling disturbance and a shear wave velocity after a soil body is remolded; calculating average effective stress and overlying effective stress of the soil body before sampling; and calculating to obtain the structural disturbance degree of the soil body, caused by sampling of each depth. The method disclosed by the invention is simple in testing step and accurate in testing result; and two influence factors including soil body structural disturbance (unrecoverable disturbance) and stress state changes (recoverable disturbance) in a sampling process are separated so that the structural disturbance degree of the soil body, caused by the sampling process, can be calculated in field and indoors respectively.

Description

technical field [0001] The invention relates to a soil disturbance calculation method, in particular to a method for calculating the structural disturbance degree of soft soil by using the shear modulus change. Background technique [0002] At present, the physical and mechanical properties of soil are mainly evaluated through two parts: in-situ test and indoor test. The indoor test has the advantages of economy, flexibility and easy control, but in the existing sampling process, although a lot of research and improvement have been done, it will inevitably cause disturbance to the soil. In order to reduce the impact of sampling disturbance on laboratory test results and accurately test the physical and mechanical properties of soil, in addition to improving sampling equipment and improving the technical level to minimize disturbance, a quantitative evaluation system for the degree of structural disturbance of sampling to soil samples should also be established. . The soil ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/07
CPCG01N29/07G01N2291/011G01N2291/023
Inventor 周燕国刘弈辰孙政波陈捷陈云敏黄博
Owner ZHEJIANG UNIV
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