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某滑坡在自然状态下是稳定的,滑坡圈椅状地形、前缘出水点等地质特征明显。榆佳高速公路在其中前部通过,经过滑坡监测、Flac3d数值仿真,分析滑坡的应力、变形机制后认为:公路建设的进行诱发了滑坡的复活,使其处于欠稳定状态;不合理爆破作业,加上公路下方某建筑基坑的开挖,加剧了滑坡的变形破坏过程,再考虑降雨的不利影响,该滑坡存在失稳的可能。裂缝监测表明,这些活动加剧了滑坡的变形速率,人类工程活动是其复活的主因,建议采取弱爆破、基坑支护、截排水和坡面裂缝封闭等综合治理措施。
A landslide is stable under natural conditions. Landslides, landscaped terrain and drainage points at the front edge have obvious geological features. Through the landslide monitoring and Flac3d numerical simulation, the paper analyzes the stress and deformation mechanism of the landslide and finds that: the road construction has induced the revival of the landslide, making it in a state of unstable state; the unreasonable blasting operation, Coupled with the excavation of a building foundation pit under the highway, aggravating the process of landslide deformation and failure, then consider the adverse effects of rainfall, the landslide may be instability. Crack monitoring shows that these activities exacerbate the deformation rate of landslides. Human engineering activities are the main reasons for their resurgence. We suggest adopting comprehensive measures such as weak blasting, foundation pit support, cutoff drainage and slope crack closure.