软弱基座型斜坡变形破坏机制模拟研究

兰志勇; 赵建军; 翟崇; 李俊杰; 龚凌枫

doi:10.13544/j.cnki.jeg.2014.03.010

软弱基座型斜坡变形破坏机制模拟研究

doi: 10.13544/j.cnki.jeg.2014.03.010

地质灾害防治与地质环境保护国家重点实验室成都理工大学成都 610059

基金项目:

国家自然科学基金（41102190）资助

详细信息

作者简介:
兰志勇，男，硕士研究生，地质工程专业.Email：785359248@qq.com

中图分类号: P315;P642.21;P642.22
计量
- 文章访问数: 3121
- HTML全文浏览量: 255
- PDF下载量: 712
- 被引次数: 0
出版历程
- 收稿日期: 2014-03-04
- 修回日期: 2014-05-12
- 刊出日期: 2014-06-25

FAILURE MECHANISM OF SLOPES WITH SOFT BASE FROM NUMERICAL SIMULATION

Sate Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059

摘要

摘要: 软弱基座型斜坡崩滑在我国西南山区及三峡库区是一种较为常见的地质灾害。下伏软岩在上部硬岩重力作用和外营力地质作用下产生压缩变形，向临空方向塑性流动，导致上部硬岩拉裂，进一步发展演变为崩滑。贵州某斜坡为一典型缓倾内软弱基座斜坡，上部为灰岩形成高度约150m陡崖，下部为厚度大于150m泥岩形成的缓坡。调查发现上部硬岩坡肩部位产生多条深大拉裂，坡肩局部发生过多次崩塌落石现象，斜坡变形仍在继续。本文采用有限元数值模拟和底摩擦物理模拟相结合的方法，分析了该斜坡坡体内应力、变形分布特征和发展过程，在此基础上研究软弱基座型斜坡的变形破坏机制，为软弱基座斜坡崩滑地质灾害防治提供理论支撑。研究结果表明，缓倾内具软弱基座的斜坡变形破坏机制表现为压缩（塑流）拉裂剪断三段式滑坡。
- 软弱基座 /
- 有限元分析 /
- 底摩擦试验 /
- 滑坡
Abstract: Collapses and landslides in slopes with soft base are very common geologic disasters in southwestern mountain regions and the Three Gorges reservoir area of China. They are harmful. The upper hard rock weight,the weathering and water softening and the underlain by soft rock base can generate compression and horizontal plastic flow towards the free face. Therefore,the upper hard rock can generate tensile cracks. Ultimately they lead to collapses and landslides. A slope in Guizhou is examined. Its upper part has a height of about 150m and is a limestone cliffs. Its lower part has a thickness greater than150m and is a shale gentle slope. It is a typical slope of a gently inclined ramp within the weak base. This paper uses the finite element numerical simulation and bottom friction method of combining physical simulation. It analyses the slope of the body stress,deformation distribution and development process. Based on this model,the paper studies the weak base of slope and its deformation and failure mechanisms and provides the theoretical support for the weak base slope of geological disasters protection. The results show that the slope deformation and failure mechanisms dipping the base are of the three performance of a compressed plastic flow,tension crack and shear-cut.
- Soft foundation /
- Finite element analysis /
- Bottom friction test /
- Landslide

HTML全文

参考文献(1)

[1] 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, 2009.Zhang Zhuoyuan, Wang Shitian, Wang Lansheng.Principle of Engineering Geology Analysis.Beijing: Geological Publishing House, 2009.

[2] 黄润秋.中国西部地区典型岩质滑坡机理研究[J].第四纪研究, 2003, 23 (6): 640～647.Huang Runqiu.Mechanism of large scale landslides in western China.Quaternary Sciences, 2003, 23 (6): 640～647.

[3] 任光明, 宋彦辉,聂德新.黄河上游某电站库区一大型滑坡的基本特征及成因分析[J].工程地质学报, 2002, 10 (增): 338～392.Ren Guangming, Song Yanhui, Nie Dexin.Geological features and formation mechanism of a large scale landslide in a hydro-electric power station's reservoir area on the upreach of Yellow river.Journal of Engineering Geology, 2002, 10 (S): 338～392.

[4] 李果, 黄润秋,巨能攀,等.软弱基座型滑坡震裂机理研究[J].工程地质学报, 2011, 19 (5): 712～718.Li Guo, Huang Runqiu, Ju Nengpan, et al.Earthquake cracking mechanism of landslide with soft foundation.Journal of Engineering Geology, 2011, 19 (5): 712～718.

[5] 李作兵, 粟兰,吴文博.擎天峰危岩体稳定性研究[J].路基工程, 2012, (4): 46～50.Li Zuobing, Su Lan, Wu Wenbo.Study of stability in dangerous rock mass at Qingtian Peak.Subgrade Engineering, 2012, (4): 46～50.

[6] 童立强, 张晓坤,李曼,等."6·28"关岭滑坡特大地质灾害应急遥感调查研究[J].国土资源遥感, 2010, (3): 65～68.Tong Liqiang, Zhang Xiaokun, Li Man, et al.Emergency remote sensing research on super large geological disasters caused by "6.28"Guanling landslide.Remote Sensing for Land & Resources, 2010, (3): 65～68.

[7] 陈洪凯, 唐红梅,王蓉.三峡库区危岩稳定性计算方法及应用[J].岩石力学与工程学报, 2004, 23 (4): 614～619.Chen Hongkai, Tang Hongmei, Wang Rong.Calculation method of stability for unstable rock and application to the Three Gorges reservoir.Chinese Journal of Rock Mechanics and Engineering, 2004, 23 (4): 614～619.

[8] 陈小洋, 杨茂勇.四川地震灾区巴中市南江县鹰嘴岩危岩形成机制分析[J].中国新技术新产品, 2012, (1): 48～50.Chen Xiaoyang, Yang Maoyong.Sichuan earthquake Bazhong Nanjiang Yingzuiyan dangerous rock formation mechanism analysis.China New Technologies and Products, 2012, (1): 48～50.

[9] 许家美.重庆涪陵区谷水溪滑坡监测与预警[J].中国地质灾害与防治学报, 2005, 16 (3): 152～155.Xu Jiamei.Monitoring and warning of Gushuixi landslide in Fuling district, Chongqing.The Chinese Journal of Geological Hazard and Control, 2005, 16 (3): 152～155.

[10] 张国见, 刘成渝,黄润秋,等.华蓥山溪口滑坡的形成机制及其旁侧变形体的整治方案[J].中国地质灾害与防治学报, 1994, 5 (增): 384～392.Zhang Guojian, Liu Chengyu, Huang Runqiu, et al.A mechansim of forming Xikou landslide in Huaying Mountain and a scheme of controlling the deformed mass beside it.The Chinese Journal of Geological Hazard and Control, 1994, 5 (S): 384～392.

[11] Zaruba Q,Mencl V.Engineering Geology[M].Amsterdam: Elsevier Publishers, 1976.

[12] Matsukura Y.Cliff instability in pumice flow deposits due to notch formation on the Asama Mountain slope, Japan[J].Zeitschrift für Geomorphologie, 1988, 32: 129～141.

[13] 任光明, 宋彦辉,聂德新,等.软弱基座型斜坡变形破坏过程研究[J].岩石力学与工程学报, 2003, 22 (9): 1510～1513.Ren Guangming, Song Yanhui, Nie Dexin, et al.Study of deformation and failure process of soft foundation slope.Chinese Journal of Rock Mechanics and Engineering, 2003, 22 (9): 1510～1513.

[14] 史文兵, 李洪建,刘启锟.软弱基座型危岩变形破坏机制与防治[A].贵州省岩石力学与工程学会2011年度学术交流论文集[C].贵阳: 2011.Shi Wenbing, Li Hongjian, Liu Qikun.Mechanism of deformation and failure and preventing of soft foundation slope.Proceedings Academic Exchanges of Guizhou Provincial Institute of Rock Mechanics and Engineering 2011.Guiyang: 2011.

[15] 赵建军, 巨能攀,李果,等.汶川地震诱发罐滩滑坡形成机制初步分析[J].地质灾害与环境保护, 2010, 21 (2): 92～96.Zhao Jianjun, Ju Nengpan, Li Guo, et al.Failure mechanism analysis of Guantan landslide induced by Wenchuan earthquake.Journal of Geological Hazards and Environment Preservation, 2010, 21 (2): 92～96.

[16] 陈小婷, 黄波林,刘广宁,等.三峡库区平缓层状软硬相间斜坡变形模式变化分析[J].地质灾害与环境保护, 2009, 20 (2): 57～61.Chen Xiaoting, Huang Bolin, Liu Guangning, et al.Analysising on deforming mode transforming of gentle soft-Ard interbed slopes in Three Gorges reservoir.Journal of Geological Hazards and Environment Preservation, 2009, 20 (2): 57～61.

[17] 柴贺军, 肖文.具有软弱基座逆向边坡变形及破坏过程研究[J].地球科学进展, 2004, 19 (增1): 288～291.Chai Hejun, Xiao Wen.Research on deformation and destructive process of reverse slope with soft foundation.Advance in Earth Sciences, 2004, 19 (S1): 288～291.

[18] Lechman J B,Griffiths D V.Analysis of the progression of failure of earth slopes by finite elements[A].In: Griffiths D V ed.Geotechnical Special Publication: Slope Stability 2000[C].New York: ASCE, 2000, 250～265.

[19] 吴辉, 马双科,郑娅娜.暴雨及久雨条件对某滑坡变形破坏机制的影响研究[J].中外公路, 2012, 32 (2): 23～28.Wu Hui, Ma Shuangke, Zheng Yana.Storm and long rain conditions on the deformation and failure mechanism of a landslide impact study.Journal of China & Foreign Highway, 2012, 32 (2): 23～28.

[20] 冯文凯, 石豫川,柴贺军,等.缓倾角层状高边坡变形破坏机制物理模拟研究[J].中国公路学报, 2004, 17 (2): 32～36.Feng Wenkai, Shi Yuchuan, Chai Hejun, et al.Study of mechanism of deformation failure of a low-angle bedded high slope with physical simulation method.China Journal of Highway and Transport, 2004, 17 (2): 32～36.

[21] 崔杰, 王兰生,王卫,等.采空区边坡变形破裂演化机制研究[J].采矿与安全工程学报, 2008, 25 (4): 409～414.Cui Jie, Wang Lansheng, Wang Wei, et al.Deformation and fracturing mechanism of goaf slope.Journal of Mining & Safety Engineering, 2008, 25 (4): 409～414.

[22] 石豫川, 冯文凯,冯学钢,等.国道108线某段缓倾角顺层边坡变形破坏机制物理模拟研究[J].成都理工大学学报, 2003, 30 (4): 350～355.Shi Yuchuan, Feng Wenkai, Feng Xuegang, et al.Study on mechanism of deformation failure of a low-angle dip bedding slope of national highway No.108 by physical simulation method.Journal of Chengdu University of Technology, 2003, 30 (4): 350～355.

[23] 王根龙, 伍法权,祁生文,等.塑流—拉裂式崩塌机制及评价方法[J].岩石力学与工程学报, 2013, 32 (增1): 2863～2869.Wang Genlong, Wu Faquan, Qi Shengwen, et al.Mechanism and assessment methods for plastic flow and tensile crack-type collapse.Chinese Journal of Rock Mechanics and Engineering, 2013, 32 (S1): 2863～2869.

施引文献

资源附件(0)

访问统计