红层软岩顺层滑坡临滑预报的强度控制方法*

 我国西部地区侏罗系、白垩系、第三系红层软岩广泛分布，红层软岩岩体强度低、抗风化能力弱、水敏感性强、工程地质性质较差、滑坡灾害严重。红层软岩顺层滑坡赋存的地质环境条件是形成滑坡的控制性因素，岩体强度特征决定滑坡的力学变形机制。不同变形、破坏条件影响红层软岩滑坡运移机制与特征。红层软岩岩体强度各向异性规律性强，岩层层面在各种地质营力的长期作用下逐步演化为滑动面。在研究红层软岩不同破坏条件下岩体强度特征与岩层层面抗剪强度变化规律，分析红层软岩滑坡的蠕动变形与滑动面形成机制的基础上，通过对典型红层软岩顺层滑坡临滑预报实例分析，提出了一种红层软岩顺层滑坡临滑预报的强度控制方法。

STRENGTH CONTROLLING FORECAST METHOD OF CRITICAL LANDSLIDE ALONG RED-SOFT-MUDSTONE LAYER

Red-soft-mudstone layer landslides of Jurassic，Cretaceous and Tertiary are widely distributed in north China. The basic characteristics of red-soft-mudstone layer are weak anti-weathering ability，low rock mass strength，and bad engineering geological property. The layer is very sensitive to water，and landslide hazards in the area of red-soft-mudstone is very serious. Geological environmental conditions of the red-mudstone layer landslides are the key factors for forming landslides. Rock mass strength characteristics determine the mechanics and deformation mechanism of landslides. The traits and moving characteristics of red-mudstone layer landslide are varied with different conditions of deformation and failure. Based on the study of rock mass strength in different conditions and shear strength of rock layer surface，the mechanisms of creep deformation and slip plane forming are systemically analyzed. The strength-controlling forecast method of critical landslide along red-soft-mudstone layer is given after statistic analysis on typical examples of red-soft-mudstone layer landslide.