榆佳公路建设对某滑坡稳定性的影响研究

Study on Stability of Landslide Affected by Constrution of Yujia Highway

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。

The landslide under natural condition is stable. Geological feature such as round-back chair shaped terrain and water exit under front edge of the landslide are apparent. Yujia Highway passes through front part of the landslide. Slope monitoring and numerical simulation are used to study the influ- ence exerted by human activities. Stress and deformation of different working conditions of landslide are analyzed. It is found that road construction brings landslide back to life, making it in a bad state. There exists the possibility of slope failure. Crack monitoring indicates that all these activity enhance deformation velocity, human engineering action being the main factor. Suggestions of weak blasting, foundation pit supporting, intercepting drain and crack plugging measures are proposed.