CAJ | 학술논문

黄土暗穴在水土流失方面作为一种独特的侵蚀方式，往往会威胁到建设在非饱和黄土层之上的公路边坡稳定性。基于考虑基质吸力的强度折减有限元程序，本文通过开展不同位置暗穴、单双暗穴和基质吸力赋存与丧失等条件下边坡稳定性的对比研究，着重对影响边坡稳定性的暗穴、基质吸力等因素进行了研究。研究结果表明，当暗穴接近地表时由于存在一定的减载效应而利于坡体的稳定，而当暗穴接近边坡坡脚时则成为黄土边坡稳定性的不利因素，在边坡底部存在的双暗穴明显削弱了边坡的稳定性；基质吸力使得非饱和黄土边坡安全系数增大，潜在滑动面变深，反之则使安全系数减小，潜在滑动面上移；基质吸力的丧失或减小以及暗穴的削弱作用使得潜在滑动面位置变化较大。
황토암혈재수토류실방면작위일충독특적침식방식，왕왕회위협도건설재비포화황토층지상적공로변파은정성。기우고필기질흡력적강도절감유한원정서，본문통과개전불동위치암혈、단쌍암혈화기질흡력부존여상실등조건하변파은정성적대비연구，착중대영향변파은정성적암혈、기질흡력등인소진행료연구。연구결과표명，당암혈접근지표시유우존재일정적감재효응이리우파체적은정，이당암혈접근변파파각시칙성위황토변파은정성적불리인소，재변파저부존재적쌍암혈명현삭약료변파적은정성；기질흡력사득비포화황토변파안전계수증대，잠재활동면변심，반지칙사안전계수감소，잠재활동면상이；기질흡력적상실혹감소이급암혈적삭약작용사득잠재활동면위치변화교대。
The tunneling erosion is not only a unique mode of soil erosion,but also usually an important factor to the stability of the highway slopes of unsaturated loess in the loess plateau.Based on the developed program of the strength reduction FEM with matric suction,this paper comparatively studies the different cases of the unsaturated loess slope stabilities.The results reveal the possible different effects on the stability of unsaturated loess slope by erosion tunneling as well as matric suction.The results indicate that when their occurrence nears the slope crest,the tunnel erosions prefer to maintain the stability of the slope.On the contrary,when their occurrence nears the slope toe,the tunnel erosions prefer to reduce the stability of slope especially as the tunneling is serious.The results also indicate that the safety factor of the unsaturated loess slope increases and the potential sliding surface moves downward when the matric suction is considered,while the safety factor of the unsaturated loess slope decreases and the potential sliding surface moves upward when the matric suction is ignored.