关于岩质边坡切向临空（层面外倾）破坏模式的探讨

从岩质边坡赤平投影图可知：当岩层倾向与边坡坡向呈切向时，边坡稳定性受岩层层面的影响小，但工程实践中却出现了多起岩质边坡切向临空（层面外倾）破坏的案例。需要对理论分析与工程实践截然相反的原因及切向临空（层面外倾）的破坏模式进行深入的讨论，以防止类似情况继续发生，否则它将威胁人员及财产安全。经过详实的现场调查与分析，确定切向临空（层面外倾）的破坏模式等同于顺向临空，产生顺向滑动失稳破坏，而不是沿边坡坡向滑动。提出排水、削方减重、支挡、改善滑动面（带）的岩土性质等治理方案，解除灾害安全隐患。

The Discussion on Failure Modes of Tangential and Exposed Rock Slope (Out-dip Level)

The rock slope stereographic projection figure shows :when the inclined direction of rock stratum and slope aspect is in tangential ,slope stability is less affected by rock layer .However ,in practice there were a lot of tangential and exposed rock slope (out‐dip level) damage cases .The diametrically opposite reason from theoretical analysis and engineering practice ,and the failure mode of the tangential and ex‐posed rock slope (out‐dip level) need further discussion in order to prevent a similar situation continue , otherwise it will threaten personnel and property safety .Through the detailed field investigation and anal‐ysis ,the failure modes of tangential and exposed rock slope (out‐dip level) is equivalent to bedding slope , generating consequent slide instability destruction ,instead of sliding along the slope aspect .T he drainage , reduce the volume and weight ,retaining and improving the sliding surface (zone) the geotechnical proper‐ties and other governance programs have been proposed ,and the disaster safety hazards have been re‐liev ed .