DEFORMATION MONITORING AND STABILITY ANALYSIS OF AN UNSTABLE SLOPE IN CHONGQING CITY
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摘要: 位于重庆市区的某不稳定斜坡, 其变形区范围内拟进行大规模基坑开挖, 为保证安全施工, 必须准确评价斜坡的稳定性.在现场调查、归纳地质环境条件的基础上, 对不稳定斜坡进行变形监测, 研究斜坡变形特征; 采用FLAC-3D有限差分软件进行数值模拟分析, 将结果与实际变形监测曲线进行对比、拟合, 得到监测点的位移情况, 从而准确了解不稳定斜坡的变形情况; 最后基于极限平衡法和FLAC-3D强度折减法对不稳定斜坡天然状况以及基坑开挖工况下的稳定性进行评价.Abstract: The unstable slope is located in the cantonal of Chongqing City, where large foundation excavation will be carried out in the influenced scope. Analysis on stability must be taken for construction safety. On the basis of previous studies, combined with field investigation, the geological environment of this study area is summarized. By analyzing the measured monitoring data, the displacement characteristics of the monitoring point is studied. To know the deformation of unstable slopes, FLAC-3D numerical simulation is adopted to obtain soil parameters by the comparison of monitoring curves and numerical results. Finally, based on limit equilibrium theory and strength reduction method, the evaluation results of stability are studied for natural state of unstable slopes and excavation.
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图 1 不稳定斜坡位置及其监测点布置示意图
Figure 1. A sketch map showing the locations of unstable slopes and monitoring points
图 8 模拟监测点处的累计水平位移曲线
Figure 8. Cumulative horizontal displacement curves of simulative monitoring points
表 1 滑带土抗剪强度参数综合取值表
Table 1. Slip soil integrated values of shear strength
表 2 计算模型岩土的物理力学性质参数
Table 2. Physical and mechanical properties parameters of calculation model rock
表 3 不稳定斜坡极限平衡方法和强度折减法计算结果对比
Table 3. Results contrast between limit equilibrium method and strength reduction method
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