A Method for Evaluating Disturbance Degree of Weak Soil Using Shear Wave Velocity

Abstract

The invention discloses a method for evaluating the degree of disturbance of soft soil by using shear wave velocity, which comprises the following steps: using a surface wave testing device to perform in-situ shear wave velocity testing; drilling samples; and using a portable piezoelectric ceramic bending element to shear the soil The wave velocity test device carries out the on-site shear wave velocity test; the ratio of the on-site shear wave velocity to the in-situ shear wave velocity is used as the judgment standard, and an on-site evaluation is performed according to the classification standard to judge whether the soil sample meets the sampling requirements; before the indoor strength test, the portable pressure is used again. The electric ceramic bending element soil shear wave velocity test device carries out the indoor shear wave velocity test; the ratio of the indoor shear wave velocity to the in-situ shear wave velocity is used as the judgment standard, and the indoor secondary evaluation is carried out according to the classification standard to judge whether the soil sample meets the strength test requirements. The invention has simple steps and accurate test results, can judge the disturbance degree of the sample on site and in the room, and can meet the requirements of general engineering survey and strength test.

Description

technical field [0001] The invention relates to a method for evaluating the disturbance degree of soft soil by using shear wave velocity. Background technique [0002] At present, the domestic and foreign indoor methods for evaluating the strength of soft soils are mainly to drill holes and take samples on-site for the soil whose strength needs to be evaluated, and through indoor triaxial tests (such as consolidated and undrained CU tests), first apply a certain amount of water to the soil samples in the laboratory. The confining pressure is consolidated, and then the axial force is increased until the soil is destroyed, so as to determine the undrained shear strength index of the soft soil. Because this method uses borehole sampling, there are problems such as in-situ soil stress release during sampling and mechanical disturbance of soil during transportation, storage, and sample preparation, resulting in structural damage to the soil, resulting in low shear strength. In t...

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Problems solved by technology

In addition, during the transportation, storage, and sample preparation process of the sample, the soil will be disturbed due to mechanical damage, resulting in a structural decline, so that the indoor strength test sample does not meet the test requirements.

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