鄂西北片岩质边坡变形破坏机制和对策

Deformation and Failure Mechanism and Treatment of Rock Slopes in Northwest Hubei

鄂西北广泛出露的武当群片岩,岩体变质程度深,结构特征复杂,加之雨季雨量较为充沛,在工程开挖、削坡过程中出现大量不稳定岩质边坡。十堰市某变电站在施工过程中出现的边坡失稳便是典型案例。通过对该边坡的地质条件、变形特征和稳定性进行分析,总结出对于鄂西北云母片岩区的削坡工程中除了要考虑坡向与片岩层理面产状之间的关系外,更要做好坡体表面甚至内部的排水措施,避免雨水大量入渗坡体,并且需要制定在边坡开挖过程中应对突降大雨的应急预案。

There is Wudang Group mica schist rock widely outcropped in Northwest HuBei.A large number of unstable rock slopes occurred because of deep depth of metamorphic rock,complex structural and plentiful rainfall during excavation and slope cutting.The slope failure in construction process of a Shiyan electric substation is a typical case.The instable deformation of mica schist rock slope is controlled by geological structures,deformation characteristic and stability analysis.The conclusions show that the relationship between slope dip and schist rock bedding plane needs to be considered.More important,drainage of slope surface and inter should be constructed to avoid rainfall infiltration,and emergency plan should also be established to cope with rainstorm during excavation.