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Abstract

This paper studied the mechanical properties of red clay overlying karst caves before and after grouting, including its strength characteristics and dynamic characteristics. The internal friction angle φ and cohesion c of the red clay were analyzed by fast shear test. The critical dynamic stress, dynamic shear modulus, damping ratio, and softening index of the clay were analyzed by dynamic triaxial test. The test results show that without grouting, the red clay overlying karst caves is in a soft plastic state (liquid index I L = 0.9); the internal friction angle φ is only 21.1°, and the cohesion c is only 9.7 kPa. The red clay enters a hard state (I L = −0.4), and its shear strength is further improved after the grouting amount reaches 1 200 L and 10 days of curing. The increase in grouting amount is helpful to restrain the growth of axial cumulative strain and increase the critical dynamic stress of the sample, so as to improve the anti-vibration and anti-collapse ability of the red clay overlaying the karst cave and reduce the collapse of the soil cave. The increase in grouting amount also helps to improve the dynamic shear modulus, damping ratio, and softening index, thus reducing the damage degree of soil.

Publication Date

1-18-2024

DOI

10.14048/j.issn.1671-2579.2022.06.035

First Page

189

Last Page

192

Submission Date

May 2025

Reference

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