基于拉剪破坏的边坡后缘张裂缝深度探讨

Discussion on the Depth of Slope Posterior Crack with Tension Shear Failure Review

土体的张拉效应会引起坡顶后缘一定区域内出现张裂缝,而裂缝的位置和深度决定着边坡是否安全。基于土体的变形参数、单轴抗拉应力和朗肯主动土压力理论得到边坡裂缝深度的上限,通过已有文献共同界定裂缝深度的位置、取值范围,通过算例比较,进一步解释带裂缝边坡的稳定性。边坡后缘张裂缝深度与张拉效果的发挥程度有关,张拉特性不能完全发挥时,取坡高一半作为裂缝深度上限是取得最保守安全系数的简便方法。研究方法可为边坡后缘裂缝深度取值、带裂缝边坡岩土体失稳力学机理研究提供借鉴。

The tension of soil can cause cracking of slope posterior in a certain area, and the position and depth of cracks are important to slope stability. The upper bound of crack depth is obtained based on soil deformation parameters, uniaxial tensile strength and Rankine active earth pressure theory, and the range of crack depth is confirmed by comparing with traditional methods. The stability of slope with cracks is further explained by comparing the results of ease studies. The depth of slope posterior crack is related to the tension. When the tensioning characteristics cannot be fully exerted, taking half of slope height as the upper limit of crack depth is a convenient method to obtain the most conservative safety factor. The research method can provide references for the determination of slope posterior crack depth value and the mechanism research of rock and soil instability with cracks.