信阳师范学院学报（自然科学版）2025，Vol.38Issue(1)：51-58,8.DOI:10.3969/j.issn.2097-583X.2025.01.007
不同固结条件下花岗岩残积土剪切特性试验研究
Experimental study on shear characteristics of granite residual soil under different consolidation conditions
摘要
Abstract
In order to study the triaxial undrained shear characteristics of granite residual soil under different consolidation conditions,the triaxial undrained shear tests of undisturbed granite residual soil with different consolidation stress ranges (10～50 kPa,100～300 kPa) were carried out under isobaric and K0 consolidation conditions,and the shear characteristics were analyzed. The results showed that:The consolidation method affected the stress-strain relationship of granite residual soil. The pore pressure value of the isobaric consolidation sample was higher than that of the K0 consolidation sample,and the negative pore pressure appeared when the confining pressure was less than 50 kPa. The pore pressure gradually increased with the increase of the confining pressure,and the failure mode of the sample was consistent with the shear state shown by the pore pressure. When the data were fitted based on the Mohr-Coulomb strength criterion,the cohesion value of the soil obtained under high stress was larger,the internal friction angle value was smaller,and the cohesion value obtained by K0 consolidation was higher. The generalized power function could describe the strength nonlinearity of granite residual soil. The total stress tangent friction angle of the K0 consolidated sample was higher than that of the isobaric consolidated sample,and the effective stress tangent friction angle obtained by the K0 consolidation was larger at low stress. The consolidation method had a great influence on the deformation characteristics of granite residual soil. It was easy to overestimate the ultimate strain and affect the safety of the project by using the isobaric consolidation method.关键词
花岗岩残积土/K0固结/等压固结/剪切特性/强度非线性Key words
granite residual soil/K0 consolidation/isobaric consolidation/shear characteristics/strength nonlinearity分类
土木建筑引用本文复制引用
尹松,何文源,白林杰,李玉儒,贺雅,郑丝月..不同固结条件下花岗岩残积土剪切特性试验研究[J].信阳师范学院学报（自然科学版）,2025,38(1):51-58,8.基金项目
国家自然科学基金项目(51709290) （51709290）
河南省高等学校青年骨干教师培养计划项目(2020GGJS136) （2020GGJS136）
中原工学院优势学科实力提升计划项目(GG202218) （GG202218）
