非饱和花岗岩残积土崩解机制试验研究

为研究非饱和花岗岩残积土的崩解机制，将取自广州的残积土试样根据不同含水率和压实度进行制备，用自制仪器进行崩解性试验，并对相关公式进行修正并用于试验数据处理。同时，从微观角度将土颗粒的粒间受力状态进行简化分析，继而对非饱和花岗岩残积土的崩解机制进行分析，结果表明，主要控制因素为孔隙气压（有效孔隙率）和基质吸力。结合试验结果，建立崩解稳定阶段平均速度与有效空洞率及基质吸力的关系，结果表明，分别呈指数函数和对数函数正相关。

Experimental study of disintegration mechanism for unsaturated granite residual soil

In order to study the disintegration mechanism of unsaturated granite residual soil, a serious of samples with different moisture contents and compaction degrees are made from granite residual soils from Guangzhou, south of China. Homemade apparatus is used for test, and meliorated method and computation formula were utilized for analysis. This meliorated method considered gas evolution during immersing into water so as to reduce the avoidable errors. Meanwhile, simplified model of particles with low degree of saturation is analyzed from the microscopic perspective. The disintegration mechanism of unsaturated granite residual soil is analyzed. The main controlling factors had been regarded as effective void ratio and matric suction. Relationship between above two control factors and disintegrating velocity has been established on the basis of effective void ratio analysis and estimation of soil water characteristic curve (SWCC). The results reveal that it shows exponential function and logarithm function relationships respectively.