CAJ | 학술논문

以地震灾区四川省北川县曲山镇粗粒土为研究对象，利用室内GDS静／动三轴剪切仪，以围压、剪切速率、初始围压时间为变量，探讨了不同试验条件下粗粒土的抗剪强度指标变化，分析了粗粒土力学剪切过程和变形破坏形态。试验结果表明：试样的应力一应变曲线均呈现应变硬化现象；围压、剪切速率、初始围压时间对土体的力学特性均有不同程度的影响，其中围压的影响最为明显；土体的黏聚力为20．99kPa，内摩擦角为22.7°；试样在达到20％的应变时，未出现明显的破裂面，而是呈径向鼓状，外形匀称。研究成果对认识粗粒土变形破坏机理具有一定的意义，同时能够为合理选取室内三轴试验条件参数提供参考。
이지진재구사천성북천현곡산진조립토위연구대상，이용실내GDS정／동삼축전절의，이위압、전절속솔、초시위압시간위변량，탐토료불동시험조건하조립토적항전강도지표변화，분석료조립토역학전절과정화변형파배형태。시험결과표명：시양적응력일응변곡선균정현응변경화현상；위압、전절속솔、초시위압시간대토체적역학특성균유불동정도적영향，기중위압적영향최위명현；토체적점취력위20．99kPa，내마찰각위22.7°；시양재체도20％적응변시，미출현명현적파렬면，이시정경향고상，외형균칭。연구성과대인식조립토변형파배궤리구유일정적의의，동시능구위합리선취실내삼축시험조건삼수제공삼고。
Taking the coarse-grained soil in the earthquake area as the research object and considering confining pressure, shear rates, consolidation time as test variables, stress-strain relationship and strength characteristics were studied. Using cohesion and friction angle to evaluate the soil strength, the change of shear strength were discussed under different experimental conditions, and mechanical shearing process and deformation shapes were analyzed. The results show that stress-strain curves present strain-hardening phenomenon, and the confining pressure is the most influential among the variables. The cohesion is 20.99 kPa and friction angle is 22.7°. When the soil strain reaches to 20% , there is no obvious failure surface, but presents radial barrel deformation and well-balanced outside form. The results can not only offer some theoretical guidance in understanding the coarse-grained soil deformation and failure mecha- nism, but also provide references to select the reasonable triaxial test parameters.