Stability Analysis of Slope with Complex Spacial Shape
-
摘要: 为合理评价复杂空间形态边坡的稳定性，基于边坡的三维点安全系数，利用三维数值模拟，提出了边坡稳定性的三步点安全系数计算方法.首先，采用强度折减法降低边坡体的抗剪强度指标，使边坡处于临界状态或者大变形状态，计算边坡临界状态的位移场；其次，设置实际的边坡岩土体物理力学参数，计算当前状态应力场；最后，综合临界状态位移场和当前状态应力场，计算边坡的点安全系数.将此方法应用于贵州贞丰煤电厂运煤道路高边坡工程，计算结果表明：未加固边坡的整体安全系数虽大于设计值1.35，但坡脚局部稳定性系数小于设计值；按照点安全系数分布规律对该高边坡的下部两级边坡采用锚杆加固，确定坡脚锚杆加固的范围为下部两级边坡，锚杆加固深度为坡面以下8 m，锚杆间距为2.0 m，锚杆直径为25 mm，锚杆加固后，边坡的局部稳定性得到显著改善，坡体点安全系数均大于1.35.Abstract: Based on the three-dimensional point safety factor, a three-step point safety factor approach is proposed using three-dimensional numerical analysis to evaluate the stability of slope with complex spacial shape. First, the displacement field of slope in critical state is calculated with the reduced shear strength parameters of slope mass to obtain the critical state or large deformation state of slope using the strength reduction method. Second, the stress field of slope in current state is calculated by setting actual physical and mechanical parameters of slope mass. Finally, point safety factors of slope are obtained according to results of the displacement field in critical state and the stress field in current state. The proposed method is applied in the high slope project along the transportation road at Zhenfeng Coal-Fired Power Plant, Guizhou Province. It is shown that, the global safety factor of the unreinforced high slope is greater than the design value of 1.35, but the local safety factor at the toe is less than the design safety factor. Also, the local stability of the slope is markedly improved and its point safety factors are greater than 1.35 after the lower two levels of the high slope are reinforced by 8 m long and 25 mm in diameter anchors with a space of 2.0 m according to the distribution characteristics of point safety factors.
-
Key words:
- high slope /
- stability analysis /
- point safety factor /
- numerical computation /
- complex spacial shape
-
图 4 计算网格及极限状态位移云图
Figure 4. Numerical grid and contour map of displacement in limit state
-
CHEN W F. Limit analysis and soil plasticity[M]. New York:American Elsevier Scientific Publishing, 1974:121-128. 栾茂田, 金崇磐, 林皋.土体稳定分析极限平衡法改进及其应用[J].岩土工程学报, 1992(增刊1):20-29. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=QK000003632292LUAN Maotian, JIN Chongpan, LIN Gao. Improved limit equilibrium method and its applications to stability analysis of soil masses[J]. Chinese Journal of Geotechnical Engineering, 1992, 4(Sup.1):20-29. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=QK000003632292 陈祖煜, 汪小刚, 杨健, 等.岩质边坡稳定分析:原理、方法、程序[M].北京:中国水利水电出版社, 2005:373-399. 陈祖煜.土力学经典问题的极限分析上、下限解[J].岩土工程学报, 2002, 24(1):1-11. doi: 10.3321/j.issn:1000-4548.2002.01.001CHEN Zuyu. Limit analysis for the classic problems of soil mechanics[J]. Chinese Journal of Geotechnical Engineering, 2002, 24(1):1-11. doi: 10.3321/j.issn:1000-4548.2002.01.001 杨涛, 周德培, 罗阳明.考虑层间作用的多层滑坡分析方法[J].岩石力学与工程学报, 2005, 24(4):1129-1133. http://d.old.wanfangdata.com.cn/Periodical/yslxygcxb200507007YANG Tao, ZHOU Depei, LUO Yangming. A new method considering inter-layer interactions for analysis of multi-layers landslides[J]. Chinese Journal of Rock Mechanics and Engineering, 2005, 24(4):1129-1133. http://d.old.wanfangdata.com.cn/Periodical/yslxygcxb200507007 连镇营, 韩国城, 孔宪京.强度折减法研究开挖边坡的稳定性[J].岩土工程学报, 2001, 23(4):407-411. doi: 10.3321/j.issn:1000-4548.2001.04.005LIAN Zhenying, HAN Guocheng, KONG Xianjing. Stability analysis of excavation by strength reduction FEM[J]. Chinese Journal of Geotechnical Engineering, 2001, 23(4):407-411. doi: 10.3321/j.issn:1000-4548.2001.04.005 赵尚毅, 郑颖人, 邓卫东.用有限元强度折减法进行节理岩质边坡稳定性分析[J].岩石力学与工程学报, 2003, 22(2):254-260. doi: 10.3321/j.issn:1000-6915.2003.02.018ZHAO Shangyi, ZHENG Yingren, DENG Weidong. Stability analysis on jointed rock slope by strength reduction FEM[J]. Chinese Journal of Rock Mechanics and Engineering, 2003, 22(2):254-260. doi: 10.3321/j.issn:1000-6915.2003.02.018 王庚荪.边坡的渐进破坏及稳定性分析[J].岩石力学与工程学报, 2000, 19(1):29-33. doi: 10.3321/j.issn:1000-6915.2000.01.006WANG Gengsun. The progressive failure of slope and the stability analyses[J]. Chinese Journal of Rock Mechanics and Engineering. 2000, 19(1):29-33. doi: 10.3321/j.issn:1000-6915.2000.01.006 凌道盛, 涂福彬, 卜令方.基于黏聚区域模型的边坡渐进破坏过程强化有限元分析[J].岩土工程学报, 2012, 34(8):1387-1393. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=QK201203748321LING Daosheng, TU Fubin, BU Lingfang. Enhanced finite element analy sis of progressive failure of slopes based on cohesive zone model[J]. Chinese Journal of Rock Mechanics and Engineering. 2012, 34(8):1387-1393. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=QK201203748321 余飞, 陈善雄, 余和平.顺层岩质边坡渐进破坏及失稳机理的数值模拟研究[J].岩土力学, 2005(增刊2):36-40. http://d.old.wanfangdata.com.cn/Conference/6062995YU Fei, CHEN Shanxiong, YU Heping. Numerical simulation study on progressive destruction and failure mechanism of bedding rock slopes[J]. Rock and Soil Mechanics. 2005(Sup.2):36-40. http://d.old.wanfangdata.com.cn/Conference/6062995 王毓泰, 周维垣.拱坝坝肩岩体稳定分析[M].贵州人民出版社, 1982:78-82. 吴家冠, 段亚辉.江坪河水电站溢洪洞围岩稳定性仿真分析[J].岩土力学, 2009, 30(8):2431-2435, 2441. doi: 10.3969/j.issn.1000-7598.2009.08.040WU Jiaguan, DUAN Yahui. Simulation analysis of stability of spillway tunnels of Jiangping River Hydropower Station[J]. Rock and Soil Mechanics. 2009, 30(8):2431-2435, 2441. doi: 10.3969/j.issn.1000-7598.2009.08.040 樊赟赟, 王思敬.岩土材料剪切破坏点安全系数的研究[J].岩土力学, 2009, 30(增刊2):200-203. http://d.old.wanfangdata.com.cn/Periodical/ytlx2009z2043FAN Yunyun, WANG Sijing, et al. Research on point safety factor of shear failure geomaterials[J]. Rock and Soil Mechanics, 2009, 30(Sup.2):200-203. http://d.old.wanfangdata.com.cn/Periodical/ytlx2009z2043 周华, 王国进.小湾拱坝坝基开挖卸荷松弛效应的有限元分析[J].岩土力学, 2009, 30(4):1175-1180. doi: 10.3969/j.issn.1000-7598.2009.04.055ZHOU Hua, WANG Guojin, et al. Finite element analysis of foundation unloading and relaxation effects of Xiaowan arch dam[J]. Rock and Soil Mechanics, 2009, 30(4):1175-1180. doi: 10.3969/j.issn.1000-7598.2009.04.055 杨涛, 周德培, 马惠民, 等.滑坡稳定性分析的点安全系数法[J].岩土力学, 2010, 32(3):971-975. doi: 10.3969/j.issn.1000-7598.2010.03.052YANG Tao, ZHOU Depei, MA Huimin. Point safety factor method for stability analysis of landslide[J]. Rock and Soil Mechanics, 2010, 32(3):971-975. doi: 10.3969/j.issn.1000-7598.2010.03.052 杨涛, 刘涌江, 杨兵, 等.应用点安全系数分析基坑边坡三维稳定性[J].岩土力学, 2014, 35(6):1756-1761. http://d.old.wanfangdata.com.cn/Periodical/ytlx201406034YANG Tao, LIU Yongjiang, YANG Bing, et al. Analysis of three-dimensional stability of slope in foundation pit using point safety factor[J]. Rock and Soil Mechanics, 2014, 35(6):1756-1761. http://d.old.wanfangdata.com.cn/Periodical/ytlx201406034 -
下载:
点击查看大图
图(6)
计量
- 文章访问数: 484
- HTML全文浏览量: 180
- PDF下载量: 133
- 被引次数: 0