簸箕山大型老滑坡滑动带的结构特征及形成机制试验研究

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摘要上更新世红色黏土岩是黄土高原大型滑坡的易滑地层，对其滑动带的结构特征及形成机制研究较少。在对黏土岩滑动带的组构、构造特征进行解析的基础上，通过三轴应力–应变试验、残余强度试验及滑带土蠕变试验，分析大型滑坡黏土岩滑动带的形成机制。研究表明：(1) 簸箕山黏土岩滑动带发育密集的近水平剪切面，伴随滑带土结构改变的是塑性变形、剪切变形，运动方式上以块体滑动为主；(2) 黏土岩转变为滑带土后，裂隙增多，平均吸水速率达2.7 g/h，其标准岩样单位时间吸水速率是原岩的1.5倍，活性为0.83，比表面积、活性均高于原岩；(3) 与原岩结构改变相应的是强度的衰减，含水率为19.1%时，黏土岩原岩的峰值强度的黏聚力613 kPa，内摩擦角26.7°，簸箕山滑带土长期强度的黏聚力57.4 kPa，内摩擦角20.47°，残余强度的黏聚力8.79 kPa，内摩擦角为17.2°。

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关键词 ：边坡工程, 滑坡, 滑动带, 结构, 机制

Abstract：The slip zone of large-scale landslide in the Loess Plateau has been identified as red clay rock of Upper Pleistocene. However，there are few studies about the structural characteristics and formation mechanism of the slip zone. Herein，the fabrics and structural characteristics of clay rocks are introduced based on drilling core analysis，surface survey，X-ray diffraction and scanning electron microscope. Meanwhile，stress-strain test，residual strength test and slip zone creep experiment are also implemented. The formation mechanism of interbedded shear zone in the large-scale landslides is therefore analyzed. The results indicate that the main slip zone consists of rich-developed approximately horizontal shear plane. Plastic deformation and shear deformation break out together with the changes of soil structures in the slip zone. As for the mode of motion，block sliding prevail. It is also found that clay rocks suffer more fissures after evolving into soil of slip zone. The average water absorption velocity reaches 2.7 g/h and the penetrability is promoted. Under such a condition，the water absorption velocity of the standard rock sample in unit period accounts for 1.5 times of original rocks；the specific activity is 0.83. It is better than original rocks in terms of specific surface area and activity. Furthermore，structural changes of original rocks are accompanied by strength attenuation. According to test results，the conhesion of peak strength for original clay rocks with water content of 19.1% is 613 kPa，and the internal friction angle is 26.7°. In Boji mountain，the conhesion and internal friction angle of residual strength of slip zone is 8.79 kPa and 17.2°，respectively；the conhesion and internal friction angle of long-term strength of slip zone is 57.4 kPa and 20.47°，respectively.

Key words： slope engineering landslides slip zone structure mechanism

收稿日期: 2012-10-08

引用本文:

辛鹏1，2，吴树仁1，2，石菊松1，2，王涛1，2，石玲1，2，韩金良1，2. 簸箕山大型老滑坡滑动带的结构特征及形成机制试验研究[J]. 岩石力学与工程学报, 2013, 32(7): 1382-1391.
XIN Peng1，2，WU Shuren1，2，SHI Jusong1，2，WANG Tao1，2，SHI Ling1，2，HAN Jinliang1，2. STRUCTURAL CHARACTERISTICS OF SOFT-ROCK SLIP ZONE AND EXPERIMENTAL STUDY OF ITS FORMATION MECHANISM IN BOJI MOUNTAIN LARGE-SCALE OLD LANDSLIDE. , 2013, 32(7): 1382-1391.

链接本文:

http://www.rockmech.org/CN/Y2013/V32/I7/1382

[7]	刘传正，张明霞，邹正盛，等. 宝鸡市狄家坡滑坡稳定性研究[J]. 工程地质学报，1998，6(2)：103-113.(LIU Chuanzheng，ZHANG Mingxia，ZOU Zhengsheng，et al. Research on the stability of Dijiapo slope in Baoji city[J]. Journal of Engineering Geology，1998，6(2)：103-113.(in Chinese))
[12]	SASSA K，FUKUOKA H，WANG G H，et al. Undrained dynamic- loading ring-shear apparatus and its application to landslide dynamics[J]. Landslide，2004，1(1)：7-19.
[19]	油新华，汤劲松. 土石混合体野外水平推剪试验研究[J]. 岩石力学与工程学报，2002，21(10)：1 537-1 540.(YOU Xinhua，TANG Jinsong. Research on horizontal push-shear in-situ test of soil and rock-mixture[J]. Chinese Journal of Rock Mechanics and Engineering，2002，21(10)：1 537-1 540.(in Chinese))
[2]	李守定，李晓，刘艳辉. 清江茅坪滑坡形成演化研究[J]. 岩石力学与工程学报，2006，25(2)：377-384.(LI Shouding，LI Xiao，LIU Yanhui. Study on generation and evolution of Maoping landslide of Qingjiang river[J]. Chinese Journal of Rock Mechanics and Engineering，2006，25(2)：377-384.(in Chinese))
[3]	王琛，张永丽，刘浩吾. 三峡泄滩滑坡滑动带土的改进Singh- Mitchell蠕变方程[J]. 岩土力学，2005，26(3)：415-418.(WANG Chen，ZHANG Yongli，LIU Haowu. A modified Singh-Mitchell?s creep function of sliding zone soils of Xietan landslide in Three Gorges[J]. Rock and Soil Mechanics，2005，26(3)：415-418.(in Chinese)) " target="_blank">
[5]	胡海涛，项式均，王肇芬，等. 关中西部滑坡的结构、构造特征及稳定性分析[J]. 地质学报，1965，45(4)：435-465.(HU Haitao，XIANG Shijun，WANG Zhaofen，et al. Analysis of the structure and formation characteristics and stability of the landslide in the Central and Western China[J]. Acta Geologica Sinica，1965，45(4)：435-465. (in Chinese)) " target="_blank">
[6]	胡广韬. 宝鸡—常兴一带黄土塬边滑坡原因与因素的历史转化性[J]. 长安大学学报：地球科学版，1986，8(4)：23-27.(HU Guangtao. The historical transformation of the landsliding causes and factors in the border slopes of loessial high land in the Baoji—Changxing area[J]. Journal of Chang?an University：Earth Science，1986，8(4)：23-27.(in Chinese)) " target="_blank">
[8]	李滨. 多级旋转型黄土滑坡形成演化机制研究[博士学位论文][D]. 西安：长安大学，2009.(LI Bin. Research on formation evolution mechanism of multiple rotational loess landslides[Ph. D. Thesis][D]. Xi?an：Chang?an University，2009.(in Chinese)) " target="_blank">
[9]	徐张建，林在贯，张茂省. 中国黄土与黄土滑坡[J]. 岩石力学与工程学报，2007，26(7)：1 297-1 312.(XU Zhangjian，LIN Zaiguan，ZHANG Maosheng. Loess in China and loess landslides[J]. Chinese Journal of Rock Mechanics and Engineering，2007，26(7)：1 297-1 312. (in Chinese))
[10]	SKEMPTON A W. Residual strength of clays in landslides，foldedstrata and the laboratory[J]. Geotechnique，1985，35(1)：3-18. " target="_blank">
[11]	HUNGR O. A model for the runout analysis of rapid flow slides， debris flows，and avalanches[J]. Canadian Geotechnical Journal，1995，32(4)：610-623. " target="_blank">
[4]	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 landslide 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))
[13]	孙萍，殷跃平，吴树仁，等. 东河口滑坡岩石微观结构及力学性质试验研究[J]. 岩石力学与工程学报，2010，29(增1)：2 872-2 879. (SUN Ping，YIN Yueping，WU Shuren，et al. Experimental study of microstruture and mechanical properties of rocks from Donghekou landslide[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(Supp.1)：2 872-2 879.(in Chinese)) " target="_blank">
[17]	李晓，梁收运，郑国东. 滑带土的研究进展[J]. 地球科学进展，2010，25(5)：484-490.(LI Xiao，LIANG Shouyun，ZHENG Guodong. Progresses in sliding zone soil of landslides[J]. Advances in Earth Science，2010，25(5)：484-490.(in Chinese))
[18]	程东幸，刘大安，丁恩保，等. 滑带土长期强度参数的衰减特性研究[J]. 岩石力学与工程学报，2005，24(增2)：5 827-5 833.(CHENG Dongxing，LIU Da?an，DING Enbao，et al. Study on attenuation characteristics of long-term strength for landslide soil[J]. Chinese Journal of Rock Mechanics and Engineering，2005，24(Supp.2)：5 827-5 833.(in Chinese)) " target="_blank">
[1]	李守定，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 Shouding，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))
[14]	龙建辉，李同录，雷晓锋，等. 黄土滑坡滑带土的物理特性研究[J].岩土工程学报，2007，29(2)：289-293.(LONG Jianhui，LI Tonglu，LEI Xiaofeng，et al. Study of physical properties of soil in sliding zone of loess landslip[J]. Chinese Journal of Geotechnical Engineering，2007，29(2)：289-293.(in Chinese))
[15]	吴树仁，金逸民，石菊松，等. 滑坡预警判据初步研究——以三峡库区为例[J]. 吉林大学学报：地球科学，2004，34(4)：596-600.(WU Shuren，JIN Yimin，SHI Jusong，et al. A primary study on landslide warning criterion—an example from the reservoir region of the Three Gorges[J]. Journal of Jilin University：Earth Science，2004，34(4)：596-600.(in Chinese)) " target="_blank">
[16]	刘小丽，邓建辉，李广涛. 滑带土强度特性研究现状[J]. 岩土力学，2004，25(11)：1 849-1 856.(LIU Xiaoli，DENG Jianhui，LI Guangtao. Shear strength properties of slip soils of landslides：an overview[J]. Rock and Soil Mechanics，2004，25(11)：1 849-1 856.(in Chinese))
[20]	GIBOS，EGASHIRA K，OHTSUBO M，et al. Strength recovery from residual state in reactivated landslides[J]. Geotechnique，2002，52(9)：683-686. " target="_blank">
[21]	李晓，张年学，李守定，等. 奉节白衣庵滑坡演化的工程地质与历史地质分析[J]. 岩石力学与工程学报，2006，25(12)：2 416-2 424. (LI Xiao，ZHANG Nianxue，LI Shouding，et al. Engineering geological and historic geological analysis of Baiyi?an landslide evolution in Fengjie county[J]. Chinese Journal of Rock Mechanics and Engineering，2006，25(12)：2 416-2 424.(in Chinese)) " target="_blank">
[22]	许强. 滑坡的变形破坏行为与内在机制[J]. 工程地质学报，2012，20(2)：145-151.(XU Qiang. Theoretical studies of prediction of landslides using slope deformation data[J]. Journal of Engineering Geology，2012，20(2)：145-151.(in Chinese)) " target="_blank">