GEOMECHANICAL MODEL OF PROGRESSIVE FAILURE FOR LARGE CONSEQUENT BEDDING ROCKSLIDE AND ITS STABILITY ANALYSIS
ZOU Zongxing1，TANG Huiming1，XIONG Chengren2，WU Yiping1，LIU Xiao2，LIAO Shaobo1
(1. Faculty of Engineering，China University of Geosciences，Wuhan，Hubei 430074，China；2. Three Gorges Research Center for Geo-hazard，Ministry of Education，China University of Geosciences，Wuhan，Hubei 430074，China)
Abstract：Large consequent bedding rockslides widely exist in nature，which are one of the major types of landslides and have been the focus in landslide research area. Based on development morphology of sliding surface，consequent bedding rockslide is divided into two categories：advancing consequent bedding rockslide and regressive consequent bedding rockslide. It reveals from the mechanical point that the nature of progressive failure of consequent bedding rockslide is weakening process of mechanical parameters of landslide. It reflects in the constitutive equation of sliding zone is the reduction of the initial shear stiffness. Thus，ratio of the shear stiffness of weaken sliding zone to initial shear stiffness is defined as the weakening coefficient of sliding zone；and the S-shaped curve is introduced to depict the spatial characteristics of the weakening coefficient in sliding zone. Based on the characteristics of large consequent bedding rockslide，the progressive-locking mechanical model is proposed；and its mathematical expression is given. The model could well reflect the characteristics of the timeliness and spatial variability of mechanical parameters of sliding zone in the progressive failure process of the landslide. Finally，formulas and steps for calculating the stability of progressive failure landslide under this model are put forward. The model is applied to the case of Jiweishan landslide in Wulong county to analyze its stability before sliding.
邹宗兴1，唐辉明1，熊承仁2，吴益平1，刘 晓2，廖少波1. 大型顺层岩质滑坡渐进破坏地质力学模型与稳定性分析[J]. 岩石力学与工程学报, 2012, 31(11): 2222-2231.
ZOU Zongxing1，TANG Huiming1，XIONG Chengren2，WU Yiping1，LIU Xiao2，LIAO Shaobo1. GEOMECHANICAL MODEL OF PROGRESSIVE FAILURE FOR LARGE CONSEQUENT BEDDING ROCKSLIDE AND ITS STABILITY ANALYSIS. , 2012, 31(11): 2222-2231.
[1] 余 飞，陈善雄，余和平. 顺层岩质边坡渐进破坏及失稳机制的数值模拟研究[J]. 岩土力学，2005，26(增)：36–40.(YU Fei，CHEN Shanxiong，YU Heping. Numerical simulation study on progressive destruction and failure mechanism of bedding rock slopes[J]. Rock and Soil Mechanics，2005，26(Supp.)：36–40.(in Chinese))
[2] 白云峰，周德培，王 科，等. 顺层滑坡的发育环境及分布特征[J]. 自然灾害学报，2004，13(3)：39–43.(BAI Yunfeng，ZHOU Depei，WANG Ke，et al. Development environment and distribution characteristics of bedding plane landslides[J]. Journal of Natural Disasters，2004，13(3)：39–43.(in Chinese))
[3] 徐邦栋. 滑坡分析与防治[M]. 北京：中国铁道出版社，2001：3.(XU Bangdong. Landslide analysis and control[M]. Beijing：China Railway Publishing House，2001：3.(in Chinese))
[4] 成永刚，王玉峰. 层面倾角对顺层岩质滑坡贡献率研究[J]. 岩土力学，2011，32(12)：3 708–3 712.(CHENG Yonggang，WANG Yufeng. Research on contribution rate for dip angle of bedding landslide[J]. Rock and Soil Mechanics，2011，32(12)：3 708– 3 712.(in Chinese))
[5] 王思敬，黄鼎成. 中国工程地质世纪成就[M]. 北京：科学出版社，2004：302.(WANG Sijing，HUANG Dingcheng. Century achievement of engineering geology in China[M]. Beijing：Science Press，2004：302.(in Chinese))
[6] 成永刚. 顺层滑坡数值模拟与监测分析[J]. 岩石力学与工程学报，2008，27(增2)：3 746–3 752.(CHENG Yonggang. Numerical simulation and monitoring analysis of bedding landslide[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(Supp.2)： 3 746–3 752.(in Chinese))
[7] 殷跃平. 长江三峡库区移民迁建新址重大地质灾害及防治研究[M]. 北京：地质出版社，2004：31.(YIN Yueping. Major geologic hazards and the prevention on relocation sites of the Three Gorges Reservoir，the Yangtze River[M]. Beijing：Geological Publishing House，2004：31.(in Chinese))
[8] 黄润秋. 20世纪以来中国的大型滑坡及其发生机制[J]. 岩石力学与工程学报，2007，26(3)：433–454.(HUANG Runqiu. Large-scale landslides and their sliding mechanisms in China since the 20th century[J]. Chinese Journal of Rock Mechanics and Engineering，2007，26(3)：433–454(In Chinese))
[9] 胡广韬. 滑坡动力学[M]. 北京：地质出版社，1995：13–15.(HU Guangtao. Landslide dynamics[M]. Beijing：Geology Publishing House，1995：13–15.(in Chinese))
[10] 李定夺，李 晓，吴 疆，等. 大型基岩顺层滑坡滑带形成演化过程与模式[J]. 岩石力学与工程学报，2007，26(12)：2 473– 2 480.(LI Dingduo，LI Xiao，WU Jiang，et al. Evolution process and pattern of sliding zone in large consequent bedding rock landslide[J]. Chinese Journal of Rock Mechanics and Engineering，2007，26(12)：2 473–2 480.(in Chinese))
[11] 朱晗迓，马美玲，尚岳全. 顺倾向层状岩质边坡溃屈破坏分析[J]. 浙江大学学报：工学版，2004，38(9)：1 144–1 149.(ZHU Hanya，MA Meiling，SHANG Yuequan. Analysis of buckling failure of consequent rock slope[J]. Journal of Zhejiang University：Engineering Science，2004，38(9)：1 144–1 149.(in Chinese))
[12] 刘 钧. 顺层边坡弯曲破坏的力学分析[J]. 工程地质学报，1997，5(4)：335–356.(LIU Jun. Mechanical analysis of bend failure of anaclinal slope[J]. Journal of Engineering Geology，1997，5(4)：335–356.(in Chinese))
[13] 李云鹏，杨治林，王芝银. 顺层边坡岩体结构稳定性位移理论[J]. 岩石力学与工程学报，2000，19(6)：747–750.(LI Yunpeng，YANG Zhilin，WANG Zhiyin. Displacement theory of structure stability for rock mass bedding slope[J]. Chinese Journal of Rock Mechanics and Engineering，2000，19(6)：747–750.(in Chinese))
[14] 刘爱华，王思敬. 平面坡体渐进破坏模型及其应用[J]. 工程地质学报，1994，2(1)：1–8.(LIU Aihua，WANG Sijing. Progressive failure model for slope with plane sliding surface and its application[J]. Journal of Engineering Geology，1994，2(1)：1–8.(in Chinese))
[15] 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.(WANG Gengsun. The progressive failure of slope and the stability analysis[J]. Chinese Journal of Rock Mechanics and Engineering，2000，19(1)：29–33.(in Chinese))
[16] 王庚荪，孔令伟，郭爱国，等. 含剪切带单元模型及其在边坡渐进破坏分析中的应用[J]. 岩石力学与工程学报，2005，24(21)： 3 852–3 857.(WANG Gengsun，KONG Lingwei，GUO Aiguo， et al. Element model with shear band and its application to progressive failure analysis of slopes[J]. Chinese Journal of Rock Mechanics and Engineering，2005，24(21)：3 852–3 857.(in Chinese))
[17] 张倬元，王士天，王兰生. 工程地质分析原理[M]. 北京：地质出版社，1994：327–330.(ZHANG Zuoyuan，WANG Shitian，WANG Lansheng. Analyzing principle of Engineering Geology[M]. Beijing：Geological Publishing House，1994：327–330.(in Chinese))
[18] 潘 岳，李爱武. 殿后锁固坡体剪断边坡变形能释放与滑体起动速度关系分析[J]. 岩石力学与工程学报，2011，30(8)：1 522– 1 530.(PAN Yue，LI Aiwu. Analysis of relationship between deformation energy release of slope while locked slope bringing up rear shearing and starting velocity of landslide body[J]. Chinese Journal of Rock Mechanics and Engineering，2011，30(8)：1 522– 1 530.(in Chinese))
[19] 刘 轶，覃 冷. 浅层基岩顺层滑坡的形成机制和变形破坏特征[J]. 地下空间与工程学报，2008，4(6)：1 052–1 055.(LIU Yi，QIN Leng. Analysis of forming mechanism and deformation characteristics of shallow bedded rock landslide[J]. Chinese Journal of Underground Space and Engineering，2008，4(6)：1 052–1 055. (in Chinese))
[20] 许 强，黄润秋，殷跃平，等. 2009年“6•5”重庆武隆鸡尾山崩滑灾害基本特征与成因机制初步研究[J]. 工程地质学报，2009，17(4)：432–444.(XU Qiang，HUANG Runqiu，YIN Yueping，et al. The Jiweishan landslide on June 5，2009，in Wulong，Chongqing：characteristics and failure mechanism[J]. Journal of Engineering Geology，2009，17(4)：432–444.(in Chinese))
[21] XU Q，FAN X M，HUANG R Q，et al. A catastrophic rockslide-debris flow in Wulong，Chongqing，China in 2009：background，characterization and causes[J]. Landslides，2010，7(1)：75–87.
[22] 王志俭. 万州区红层岩土流变特性及近水平地层滑坡成因机制研究[博士学位论文][D]. 武汉：中国地质大学，2008.(WANG Zhijian. Rheological experimental study and mechanism research on gentle-dipped landslides of Jurassic red strata in Wanzhou City[Ph. D. Thesis][D]. Wuhan：China University of Geosciences，2008.(in Chinese))
[23] 黄润秋，赵松江，宋肖冰，等. 四川省宣汉县天台乡滑坡形成过程和机制分析[J]. 水文地质工程地质，2005，(1)：13–15.(HUANG Runqiu，ZHAO Songjiang，SONG Xiaobing，et al. The formation and mechanism of Tiantai landslide，Xuanhan County，Sichuan Province[J]. Hydrogeology and Engineering Geology，2005，(1)：13–15.(in Chinese))
[24] 秦四清，王思敬，孙 强，等. 非线性岩土力学基础[M]. 北京：地质出版社，2008：33–34.(QIN Siqing，WANG Sijing，SUN Qiang，et al. Nonlinear mechanics fundaments for rock and soil[M]. Beijing：Geological Publishing House，2008：33–34.(in Chinese))
[25] QIN S Q，JIAO J J，LI Z G. Nonlinear evolutionary mechanisms of instability of plane-shear slope：catastrophe，bifurcation，chaos and physical prediction[J]. Rock Mechanics and Rock Engineering，2006，39(1)：59–76.
[26] QIN S Q，JIAO J J，WANG S J，et al. A nonlinear catastrophe model of instability of planar-slip slope and chaotic dynamical mechanisms of its evolutionary process[J]. International Journal of Solids and Structures，2001，38(11)：8 093–8 109.
[27] 刘佑荣，唐辉明. 岩体力学[M]. 北京：化学工业出版社，2008：36.(LIU Yourong，TANG Huiming. Rock mechanics[M]. Beijing：Chemical Industry Press，2008：36.(in Chinese))
[28] 殷跃平. 斜倾厚层山体滑坡视向滑动机制研究——以重庆武隆鸡尾山滑坡为例[J]. 岩石力学与工程学报，2010，29(2)：217–226.(YIN Yueping. Mechanism of apparent dip slide of inclined bedding rockslide—a case study of Jiweishan rockslide in Wulong，Chongqing[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(2)：217–226.(in Chinese))
[29] 刘传正. 重庆武隆鸡尾山危岩体形成与崩塌成因分析[J]. 工程地质学报，2010，18(3)：297–304.(LIU Chuanzheng. Mechanism analysis for the Jiweishan rockfall disaster happened in Wulong，Chongqing，June 5，2009[J]. Journal of Engineering Geology，2010，18(3)：297–304.(in Chinese))
[30] 秦四清，王媛媛，马 平. 崩滑灾害临界位移演化的指数律[J]. 岩石力学与工程学报，2010，29(5)：873–880.(QIN Siqing，WANG Yuanyuan，MA Ping. Exponential laws of critical displacement evolution for landslides and avalanches[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(5)：873–880.(in Chinese))
2012, Vol. 31 
