DEFORMATION MONITORING AND STABILITY ANALYSIS OF AN UNSTABLE SLOPE IN CHONGQING CITY
-
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.
-
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
-
[1] 祝玉学.不稳定斜坡可靠性分析[M].北京:冶金工业出版社, 1993.ZHU Yu-xue.Reliability analysis of unstable slope [M].Beijing: Metallurgical Industry Press, 1993. [2] 金爱兵, 王金安.某露天边坡加固方案研究及其稳定性数值分析[J].金属矿山, 2003, (3): 1~3. http://d.old.wanfangdata.com.cn/Periodical/jsks200303001JIN Ai-bing, WANG Jin-an.Study of an open slope reinforcement scheme and numerical analysis of its stability [J].Mental Mine, 2003, (3): 1~3. http://d.old.wanfangdata.com.cn/Periodical/jsks200303001 [3] 罗本全.震区某不稳定斜坡成因机制及稳定性评价[J].中国水运, 2010, (1): 132~133. http://d.old.wanfangdata.com.cn/Periodical/zgsy-xby201001062LUO Ben-quan.Genesis mechanism and stability evaluation of an unstable slope in the earthquake area [J].China Water Transport, 2010, (1): 132~133. http://d.old.wanfangdata.com.cn/Periodical/zgsy-xby201001062 [4] 邓韧, 郑光, 许强, 等.地震灾区青川县骑马乡明家不稳定斜坡工程治理分析[J].工程建设与设计, 2011, (2): 89~91, 94. http://d.old.wanfangdata.com.cn/Periodical/gcjsysj201102026DENG Ren, ZHENG Guang, XU Qiang, et al.Analysis on project management of Mingjia unstable slope in earthquake of Qima Township, Qingchuan County [J].Construction & Design for Project, 2011, (2): 89~91, 94. http://d.old.wanfangdata.com.cn/Periodical/gcjsysj201102026 [5] 陈祖煜.土质边坡稳定分析---原理、方法、程序[M].北京:中国水利水电出版社, 2003.CHEN Zu-yi.Stability analysis of soil slope: Principle, method and procedure [M].Beijing: China Water Power Press, 2003. [6] 杜宇本, 郑光, 蒋良文, 等.大瑞铁路澜沧江大桥工程边坡稳定性三维数值模拟分析[J].地质力学学报, 2010, 16 (1): 108~114. http://journal.geomech.ac.cn/ch/reader/view_abstract.aspx?flag=1&file_no=20100113&journal_id=dzlxxbDU Yu-ben, ZHENG Guang, JIANG Liang-wen, et al.3D numerical simulation of slope stability of Lancangjiang bridge on Dali-Ruili railway [J].Journal of Geomechanics, 2010, 16 (1): 108~114. http://journal.geomech.ac.cn/ch/reader/view_abstract.aspx?flag=1&file_no=20100113&journal_id=dzlxxb [7] 罗利锐, 刘志刚.断层对隧道围岩稳定性的影响[J].地质力学学报, 2009, 15 (3): 226~232. http://journal.geomech.ac.cn/ch/reader/view_abstract.aspx?flag=1&file_no=20090303&journal_id=dzlxxbLUO Li-rui, LIU Zhi-gang.Influence of fault crush belts on the stability of tunnel rock [J].Journal of Geomechanics, 2009, 15 (3): 226~232. http://journal.geomech.ac.cn/ch/reader/view_abstract.aspx?flag=1&file_no=20090303&journal_id=dzlxxb [8] 康胜. 石阏子滑坡成因机制及稳定性研究[D]. 兰州: 兰州大学, 2006. http://cdmd.cnki.com.cn/Article/CDMD-10730-2006088601.htmKANG Sheng. Research on the genesis mechanism and stability of Shi 'ezi landslide [D]. Lanzhou: Lanzhou University, 2006. http://cdmd.cnki.com.cn/Article/CDMD-10730-2006088601.htm [9] 刘华丽, 朱大勇, 刘德富, 等.边坡安全系数的多解性讨论[J].岩土力学, 2007, 28 (8): 1661~1664. http://d.old.wanfangdata.com.cn/Periodical/ytlx200708024LIU Hua-li, ZHU Da-yong, LIU De-fu, et al.Discussion on multiple solution of safety factor of a slope [J].Rock and Soil Mechanics, 2007, 28 (8): 1661~1664. http://d.old.wanfangdata.com.cn/Periodical/ytlx200708024 [10] 邵龙潭, 李红军.土工结构稳定分析:有限元极限平衡法及其应用[M].北京:科学出版社, 2011.SHAO Long-tan, LI Hong-jun.Stability analysis of soil engineering: finite element limit equilibrium method and its application [M].Beijing: Science Press, 2011. [11] 孙玉科, 杨志法, 丁恩保, 等.中国露天矿边坡稳定性研究[M].北京:中国科学技术出版社, 1999.SUN Yu-ke, YANG Zhi-fa, DING En-bao, et al.Research on stability of open mining slope in China [M].Beijing: China Science and Technology Press, 1999. -
下载:
计量
- 文章访问数: 213
- HTML全文浏览量: 91
- PDF下载量: 10
- 被引次数: 0
