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以立方松散堆积方式为例,从理论上推导并给出了湿吸力与非饱和土含水率的定量关系表达式,开展了不同含水率状态下重塑细粒砂性土的吸力测试,对试验结果进行了曲线拟合和分析,理论计算和试验拟合结果均表明:对于特定的非饱和土,湿吸力随含水率先增大而后减小,即存在确定的界限含水率。这与“在一定的土体含水率变化范围内,非饱和土,尤其是非饱和砂性土的强度随含水率的增加而先增大后减小”的事实完全相符,这再次证明了湿吸力,而非基质吸力,才是非饱和土有效应力的重要组成部分。
Taking Cubic loose accumulation mode as an example, the quantitative relationship between wet suction and unsaturated soil moisture content is deduced theoretically and the suction test of remolded fine sand soil with different moisture content is carried out. The results of curve fitting and analysis, theoretical calculations and experimental fitting results show that: for a particular unsaturated soil, wet suction with the water content first increased and then decreased, that is, there is a definite threshold moisture content. This is consistent with the fact that “the strength of unsaturated soils, especially unsaturated sandy soils, which first increases and then decreases with increasing moisture content,” within a certain range of soil moisture content Wet suction, rather than the matrix suction, is an important part of unsaturated soil effective stress.