岩质边坡结构面的水力劈裂效应分析

Analysis of Hydraulic Fracturing Effect of Structure Plane on Rock Slope

为了对岩质边坡结构面的水力劈裂效应进行分析,通过岩质边坡水力模型,结合岩体结构面裂纹的应力状态,运用断裂力学和水力学理论,推导出结构面水力劈裂的临界水头公式,在临界水头公式基础上分别获得了最易发生拉剪型水力劈裂和压剪型水力劈裂破坏的裂纹角度。实例验证表明:边坡在满足条件时会发生水力劈裂。得出结论:随着水力劈裂现象的发生,结构面裂隙扩展、贯通,而裂隙的扩展会加强地下水的下渗作用,水头损失减少,扬压力进一步加大,将更容易诱发滑坡。

In order to analyze the hydraulic fracture effect of discontinuity on rock slope,based on the theory of fracture mechanics and hydraulics,the critical waterhead formula of hydraulic fracture on discontinuity was elicited through the hydraulic model of rock slope andthe stress condition of cracks on rock mass discontinuity.Based on the critical waterhead formula,the paper got flaw angles of the easiest occur tensile-shear-type and pressure-shear-type hydraulic fracture wreck.Finally,with examples to verify the formula,hydraulic fracture will occur on the slope when it meets the conditions.It can be put forward propagation and coalescence in cranny of discontinuity along with the occurrence of hydraulic fracture.The propagation in cranny will strengthen the infiltration effect of groundwater.When the loss of waterhead has decreased,and uplift pressure has increased further,landslides will be more likely to occur.