基质吸力对花岗岩残积土强度影响分析

花岗岩残积土分布相当广泛，是工程建设中经常遇到的土体之一。借助非饱和三轴仪进行花岗岩残积土抗剪强度试验分析，探究基质吸力对其强度参数影响。试验结果表明基质吸力和净围压的增大对花岗岩残积土强度有提升作用，花岗岩残积土黏聚力随基质吸力增大呈线性增长趋势，内摩擦角随基质吸力增大呈曲线增长趋势。基质吸力对土体弹性模量的影响也是正相关的，即弹性模量随基质吸力增大呈递增规律。根据试验结果，得出抗剪强度参数与基质吸力的关系式及不同基质吸力下土体的弹性模量表达式。

Influence of Matrix Suction on the Strength of Granite Residual Soil

Granite residual soil is widely distributed,and is one of the soils often encountered in engineering construction.In this paper,the strength of granite residual soil strength is analyzed with the help of unsaturated triaxial apparatus,and the influence of matrix suction on its strength parameters is explored.The test results show that the increase of matrix suction and net confining pressure can improve the strength of granite residual soil.The cohesion of granite residual soil increases linearly with the increase of matrix suction,and the internal friction angle increases with the increase of matrix suction.The matrix suction also has an effect on the elastic modulus of the soil,and the elastic modulus increases with the matrix suction.According to the test results,the relationship between the shear strength parameter and the matrix suction and the expression of the elastic modulus of the soil under different matrix suction are obtained.