doi:10.16186/j.cnki.1673-9787.2020030060

Received:2020/03/16

Revised:2020/03/31

Published:2021/05/15

Study on the change law of shear strength of red clay under overburden load

XIAO Lina1, HUANG Zhihong1, HE Fengchun1, QU Wentao2

1.College of Civil Engineering， Guizhou University， Guvyang  550025 ， Guizhou， China;2.College of Civil Engineering， Fuzhou University， Fuzhou  350000 ， Fujian， China

Abstract:In order to investigate the causes of cracks in road constructions such as red clay areas， the direct shear tests were used to study the change law of the shear strength index of red clay under the overburden load more in line with the actual conditions of the project. Regardless of whether there was an overburden load， the cohesion and internal friction angle in red day gradually decreased with the increase of water content， gradually increased with the increase of compaction degree， and gradually decreased with the increase of the number of dry and wet cycles ； The degree of cohesion affected by the water content and compaction was greater than that by the internal friction angle； Under the same conditions， the cohesion C and the internal friction angle p of the red clay with the overburden load were greater than those without overburden， and the effect of water content， compaction， and the number of wet and dry cycles of the shear strength index under the effect of overlying load was smaller than that without overburden load. The research results could provide more reliable technical support for road engineering construction in red clay areas.

Key words:red clay;direct shear test;overburden load;shear strength;moisture content;compactness;cohesion;internal friction angle

 上覆荷载作用下红黏土抗剪强度变化规律研究_肖丽娜.pdf