CAJ | 학술논문

分散性土是一种具有特殊工程性质的土，其典型的性质为抗渗性能差，耐冲蚀能力低，在纯水中具有很高的分散性。目前，人们对于分散性土的研究主要集中在鉴定、抗渗和改良等方面，而对其抗剪强度特性的研究很少。采用三轴CU试验研究不同初始条件下分散性土的抗剪强度特性。结果表明：分散性土的应力-应变曲线在小围压、低含水率和高干密度的状态下呈应变软化型，在围压较大、含水率较高的情况下呈弱硬化型或硬化型；黏聚力和内摩擦角均随含水率的增大而减小，并且干密度越大受水分影响越强烈；黏聚力随干密度的增大而增大，在低含水条件下，黏聚力的增幅较大，而在高含水条件下，黏聚力的增幅则较小；内摩擦角随干密度的增大有少量增大。
분산성토시일충구유특수공정성질적토，기전형적성질위항삼성능차，내충식능력저，재순수중구유흔고적분산성。목전，인문대우분산성토적연구주요집중재감정、항삼화개량등방면，이대기항전강도특성적연구흔소。채용삼축CU시험연구불동초시조건하분산성토적항전강도특성。결과표명：분산성토적응력-응변곡선재소위압、저함수솔화고간밀도적상태하정응변연화형，재위압교대、함수솔교고적정황하정약경화형혹경화형；점취력화내마찰각균수함수솔적증대이감소，병차간밀도월대수수분영향월강렬；점취력수간밀도적증대이증대，재저함수조건하，점취력적증폭교대，이재고함수조건하，점취력적증폭칙교소；내마찰각수간밀도적증대유소량증대。
Dispersive clay is a kind of soil with special engineering properties, and with typical features of poor impermeability, low erosion resistance ability, very high dispersiveness when it is in pure water. In recent years, the study of dispersive clay in the field mainly focuses on identification, penetrability, betterment and other aspects;however, the studies of shear strength properties are rare. In this paper, the conventional triaxial compression consolidated undrained (CU) test is adopted to study the dispersive clay’s shear strength characteristics under different initial conditions. The results show that: dispersive clay’s stress-strain curves present the softening type when it is under the conditions of small confining pressure, low moisture content and high dry density;but it changes into the weak hardening type or hardening type when it is under the conditions of large confining pressure and high moisture content. Dispersive clay’s cohesion and internal frictional angle all decrease while the moisture content increases. In addition, the higher the dry density is, the stronger influence of moisture has on the clay’s cohesion and internal frictional angle;its cohesion increases with the increase of dry density;and it has a larger increment under the low moisture content condition compared to that under the high moisture content conditions;internal frictional angle has a small increment with the increasing of dry density.