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为了研究双层反翘滑坡的变形破坏机制,以襄十高速公路韩家垭滑坡为背景,结合非线性蠕变模型建立考虑岩层弯曲蠕变特性的时效变形方程及平面应变条件下反翘弯曲岩层的蠕变压屈方程,对双层反翘滑坡的弯曲蠕变及变形破坏机制进行深入阐述,提出根据岩层反翘弯曲蠕变的变形速率进行滑坡稳定性评价及预测的方法,并就不同荷载水平下岩层的蠕变压屈失稳机制进行探讨,最后将分析结果与现场监测成果进行定性对比,结果表明:在雨季时,滑坡前缘岩层的荷载水平在qi(0)>qi(t)>qi(+∞)之间,岩层的反翘变形逐渐累积,滑坡发生延迟性失稳破坏;在旱季时,其荷载水平为qi(+∞)时,滑坡处于暂时稳定状态。采用本文模型对该滑坡进行定性分析、评价合理可行。
In order to study the mechanism of deformation and failure of the double anti-Alice landslide, taking the Hanjiaya landslide of Xiang-Shih Expressway as a background, the time-dependent deformation equation considering the flexural creep characteristics of rock strata and the creep deformation of rock under anti-bending conditions under the condition of plane strain are established by combining with the nonlinear creep model The equations of flexure and creep of the double anti-Alice landslide are described in detail. The method of landslide stability evaluation and prediction is proposed according to the deformation rate of flexural creep deformation of rock strata. In the light of the different load levels The results show that during the rainy season, the load level of landslide front rock strata is in the range of qi (0)> qi (t)> qi (+ ∞), the deformation of the rock formation gradually increases and the landslide is delayed and destabilized. In the dry season, the landslide is in a temporary stable state when the loading level is qi (+ ∞). Using this model, the landslide is qualitatively analyzed, and the evaluation is reasonable and feasible.