CAJ | 학술논문

南水北调中线工程干线有387 km为膨胀土或膨胀岩渠段，施工期间累计发生有一定规模的滑坡超过100处。通过对工程施工期滑坡的大量解剖、变形位移监测、土体水理指标原位观测，揭示膨胀土渠坡变形破坏主要有浅表胀缩型和较深层结构面控制型滑坡破坏两类。采用水泥改性土换填覆盖处理可以有效减少渠坡膨胀土受大气环境改造的作用，采用地面截渗和地下引排措施可以减少水对土体及结构面的不利影响。当坡体存在长大缓倾角结构面或层间软弱带时，为防止沿结构面产生滑动并维持渠坡长期稳定，必须采取结构抗滑措施。
남수북조중선공정간선유387 km위팽창토혹팽창암거단，시공기간루계발생유일정규모적활파초과100처。통과대공정시공기활파적대량해부、변형위이감측、토체수리지표원위관측，게시팽창토거파변형파배주요유천표창축형화교심층결구면공제형활파파배량류。채용수니개성토환전복개처리가이유효감소거파팽창토수대기배경개조적작용，채용지면절삼화지하인배조시가이감소수대토체급결구면적불리영향。당파체존재장대완경각결구면혹층간연약대시，위방지연결구면산생활동병유지거파장기은정，필수채취결구항활조시。
There existed 387 km long expansive soil along the Middle Route Project of South-to-North Water Diversion, and more than 100 landslides of certain scale occurred during the construction period. Through detail analysis of massive landslides, deformation monitoring and in-situ test of water physical-chemical index of the soil body, two main types of slope failures are revealed, namely the shallow expansive-contraction creep and the deep structural interface-controlled sliding. The surface lay-er substitution by cement-improved expansive soil was applied to prevent the reformation action from atmospheric environment;the surface water cutoff combined with underground drainage measures could mitigate the adverse influence of water on soil body and the structural interface. Aiming to the slope structure with long and large low-angle interfaces or soft interlayer, the anti-sliding structural measures should be used to avoid the sliding along the structure plane and maintain the long-term stability of the channel.