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西南某工程高边坡在开挖过程中,发现地面变形监测点快速移动,边坡平台和截洪沟产生位移并开裂变形。经调查后认为边坡受开挖扰动及强降雨的影响,在其后缘产生弧形拉裂缝,形成两个工程滑坡,对下方的建筑场地造成严重威胁。该文通过滑坡位移监测、现场调查及岩土工程勘察等成果,确认了滑坡范围,分析了滑坡体的形成机理,并在此基础上对滑坡体提出了坡体卸荷、坡面预应力锚索+格构梁加固、坡顶重建截洪沟并在坡面上设置深泄水孔排水等多项治理措施。采取上述措施后极限平衡法计算结果可以满足稳定性判断标准,经现场施工及监测验证治理措施有效。
During the excavation of a high-grade south-west slope of a project, it was found that the monitoring points of ground deformation moved rapidly, and the displacement of the platform and the intercepting flood ditch on the slope caused the cracking and deformation. After investigation, it is considered that the slope is affected by excavation disturbance and heavy rainfall, and a curved pull-out crack occurs at the rear edge of the slope to form two engineering landslides, posing a serious threat to the construction site below. Based on the results of landslide displacement monitoring, field investigation and geotechnical investigation, the paper confirms the scope of landslide and analyzes the formation mechanism of landslide body. On this basis, Cable + lattice beam reinforcement, slope reconstruction of flood control ditch and the slope set deep drainage holes drainage and many other control measures. After the above measures are taken, the calculation result of the limit equilibrium method can meet the criteria of stability judgment. The site construction and monitoring verify that the measures are effective.