顺层岩质边坡溃屈变形机制及失稳判定方法

溃屈型破坏是一种常见的顺层岩质边坡破坏模式，溃屈变形发展机制及失稳破坏的定量研究对滑坡工程勘查和防治指导十分重要。本文根据边坡的地质环境和力学作用机制，建立了三维受压板简化模型，其能够考虑岩层自身重力、地震力、静水压力的共同作用和岩体材料塑性变形的影响。基于弹塑性受压板稳定理论，利用能量法推导得到了边坡溃屈变形破坏的临界方程。对于溃屈型边坡的结构失稳和滑动失稳分别提出了相应的稳定性判定方法，并针对不同状态的边坡提出了相应的防治措施建议。以四川省甘孜藏族自治州巴塘县下归哇边坡为例，对所提判定方法的正确性进行了验证。计算结果表明，边坡的临界溃屈长度（a1）为483.8 m，说明下归哇边坡能够发生溃屈变形；现场勘查得知边坡实际溃屈长度（a′）为530.0 m，a′＞a1，可知边坡是稳定的。这与实际情况相吻合，由此证明本文所提出的判定方法可行。

Buckling Deformation Mechanism and Instability JudgmentMethod of Bedding Rock Slope#br#

Buckling landslide is a common failure mode of bedding rock slopes. It is very important to carry out quantitative research on the development mechanism and instability failure of buckling deformation for engineering exploration and prevention of landslides. According to the geological environment and mechanical mechanism of slopes, a simplified model of a three-dimensional compression plate is established in this paper. Combined with gravity, seismic force, hydrostatic pressure, and plastic deformation of the rock material, based on the stability theory of elastic-plastic compression plates, a critical equation of buckling deformation and failure of slopes is derived by using the energy equilibrium theory. For the structural instability and sliding instability of the buckling slope, the corresponding stability judgment methods are put forward. The corresponding prevention measures are proposed for the slopes of different status. Taking Xiaguiwa slope in Batang area in Sichuan Province as an example, the correctness of the proposed method is verified. The calculation results show that the critical buckling length (a1) of the slope is 483.8 m, indicating that the buckling deformation of Xiaguiwa slope may occur. The field investigation shows that the actual buckling length (a′) of the slope is 530.0 m, and a′ is greater than a1. According to the quantitative relationship between a′and a1, the slope is stable. This result is consistent with the actual situation, which proves the feasibility of the proposed judgment method.