CAJ | 학술논문

针对某古滑坡滑动带内的含砂黏土开展了系统的室内环剪试验，研究了粗颗粒含量对滑带土残余剪切性状及残余强度的影响，并根据所研究滑坡的多个相似剖面进行了反分析计算，综合比较了室内环剪试验和反算法得到的残余强度指标，给出了文中研究的古滑坡残余强度的推荐值。结果表明：环剪试验可以较理想地获得滑带土试样在大剪切位移下的残余强度；文中研究的滑带土与一般黏性土不同，应变软化特性总体来说不太明显，且粗颗粒含量越高越不明显；滑带土的粗颗粒含量较高时，随着粗颗粒含量的增加，等效残余内摩擦角呈非线性增高趋势。
침대모고활파활동대내적함사점토개전료계통적실내배전시험，연구료조과립함량대활대토잔여전절성상급잔여강도적영향，병근거소연구활파적다개상사부면진행료반분석계산，종합비교료실내배전시험화반산법득도적잔여강도지표，급출료문중연구적고활파잔여강도적추천치。결과표명：배전시험가이교이상지획득활대토시양재대전절위이하적잔여강도；문중연구적활대토여일반점성토불동，응변연화특성총체래설불태명현，차조과립함량월고월불명현；활대토적조과립함량교고시，수착조과립함량적증가，등효잔여내마찰각정비선성증고추세。
Systematic ring shear tests of the sand clay in an ancient landslide were carried out in laboratory to reveal the effect of coarse grain content on the residual shear character and residual strength of slip zone soils,and a back analysis was carried out with multiple similar sections.Then,the calculated residual strength was comprehensively compared with that obtained by laboratory test,with a suitable residual strength of ancient landslide being recom-mended.The results show that (1 )the ring shear test is an ideal method to obtain the residual strength under large shear displacement;(2)different from common clay,the slip zone soil is of no obvious strain-softening character, and the strain softening becomes weaker when the coarse grain content increases;and (3 )at high coarse grain con-tent,the equivalent residual internal friction angle nonlinearly increases with the coarse grain content.