|
|
|
| Analysis on deformation-failure mechanism of counter-tilt hard rock high and steep slope |
| HU Huihua，ZHANG Peng，GONG Daoping |
| (Hunan Provincial Communications Planning，Survey and Design Institute，Changsha，Hunan 410219，China) |
|
|
|
|
Abstract For the counter-tilt hard rock slope，the deformation mechanism and failure mode are controlled by rock mass structure. Based on the detailed investigation of the development and intersecting combination relationship of different structural planes in a highway slope，the deformation and failure process of the slope and the deep monitoring data are comprehensively analyzed. It is found that the deep deformation is controlled by the fault F13，the middle layer potential slip surfaces are consist of the fault F14 and part of tracing joints，and the shallow potential slip surfaces are consist of joints，weathering fracture，and unloading crack. A geological analysis model of 11 sliding surfaces in deep layer，middle layer，and shallow layer is constructed. Then the rigid body limit equilibrium analysis and discrete element simulation are carried out to summarize the deformation and failure mechanism of the counter-tilt hard rock slope. The results show that under the conditions of scouring，cutting and artificial disturbance，the slope will deform and destroy along the potential sliding surfaces with different depths and different combinations of structural planes. Through comparison of multiple schemes，treatment of anti-pressure foot protection combined with anchor bolt reinforcement，supplemented by drainage measures is proposed. After eight years of operation and monitoring，the scheme has proved to be safe，economical and reliable.
|
|
|
|
|
|
| [1] 孙广忠. 岩体结构力学[M]. 北京：科学出版社，1988：6–9.(SUN Guangzhong. Rock mass structural mechanics[M]. Beijing：Science Press，1988：6–9.(in Chinese))
[2] 孙广忠. 论“岩体结构控制论”[J]. 工程地质学报，1993，1(1)：14–18.(SUN Guangzhong. On "control theory of rock mass structure"[J]. Journal of Engineering Geology，1993，1(1)：14–18.(in Chinese))
[3] STEAD D，WOLTER A. A critical review of rock slope failure mecha-nisms：the importance of structural geology[J]. Journal of Structural Geology，2015，74：1–23.
[4] 谷德振，黄鼎成. 岩体结构的分类及其质量系数的确定[J]. 水文地质与工程地质，1979，(2)：8–14.(GU Dezhen，HUANG Dingcheng. Classification of rock mass structure and determination of its mass coefficient[J]. Hydrogeology and Engineering Geology，1979，(2)：8–14.(in Chinese))
[5] BRIDEAU M A，YAN M，STEAD D. The role of tectonic damage and brittle rock fracture in the development of large rock slope failures[J]. Geomorphology，2009，103(1)：30–49.
[6] 王林峰，陈洪凯，唐红梅. 反倾岩质边坡破坏的力学机制研究[J]. 岩土工程学报，2013，35(5)：884–889.(WANG Linfeng， CHEN Hongkai，TANG Hongmei. Study on mechanical mechanism of failure of anti-dumping rock slope[J]. Chinese Journal of Geotechnical Engineering，2013，35(5)：884–889.(in Chinese))
[7] 冷先伦，盛 谦，廖红建，等. 反倾层状岩质高边坡开挖变形破坏机理研究[J]. 岩石力学与工程学报，2004，23(增1)：4 468–4 472. (LENG Xianlun，SHENG Qian，LIAO Hongjian，et al. Analysis on deformation and failure mechanism of high antidip sandwich rock slope in excavation[J]. Chinese Journal of Rock Mechanics and Engineering，2004，23(Supp.1)：4 468–4 472.(in Chinese))
[8] 谢 莉. 反倾岩质边坡的受力特征和变形破坏机理分析[J]. 煤炭技术，2018，37(11)：161–163.(XIE Li. Study on stress characteristics and deformation failure mechanism of antidip rock slope[J]. Coal Technology，2018，37(11)：161–163.(in Chinese))
[9] 左保成，陈从新，刘小巍，等. 反倾岩质边坡破坏机理模型试验研究[J]. 岩石力学与工程学报，2005，24(19)：3 505–3 511.(ZUO Baocheng，CHEN Congxin，LIU Xiaowei，et al. Modeling experiment study on failure mechanism of counter-tilt rock slope[J]. Chinese Journal of Rock Mechanics and Engineering，2005，24(19)：3 505–3 511.(in Chinese))
[10] 祁生文，伍法权，刘春玲，等. 地震边坡稳定性的工程地质分析[J]. 岩石力学与工程学报，2004，23(16)：2 792–2 797.(QI Shengwen，WU Faquan，LIU Chunling，et al. Engineering geology analysis on stability of slope under earthquake[J]. Chinese Journal of Rock Mechanics and Engineering，2004，23(16)：2 792–2 797.(in Chinese))
[11] 任伟中，范建海，孔令伟，等. 鄂西北山区边(滑)坡综合分类探讨[J]. 岩土力学，2011，33(9)：2 735–2 740.(REN Weizhong，FAN Jianhai，KONG Lingwei，et al. Probing of synthetically classification of slope/landslides in northwest mountain area of Hubei province[J]. Rock and Soil Mechanics，2011，33(9)：2 735–2 740.(in Chinese))
[12] 柴贺军，黄地龙，黄润秋，等. 岩体结构三维可视化模型研究进展[J]. 地球科学进展，2001，(1)：55–59.(CHAI Hejun，HUANG Dilong，HUANG Runqiu，et al. New progress in the study of rock structure 3-D visualization model[J]. Advance in Earth Sciences，2001，(1)：55–59.(in Chinese))
[13] 王秀菊. 反倾层状边坡变形破坏离散元数值模拟研究[J]. 三峡大学学报：自然科学版，2017，39(4)：36–40.(WANG Xiuju. Numerical simulation research on deformation and failure of anti-dip layered rock slope with DEM[J]. Journal of China Three Gorges University：Natural Sciences，2017，39(4)：36–40.(in Chinese))
[14] 安晓凡，李 宁，孙闻博. 基于离散元法的岩质边坡倾倒变形分析[J]. 中国科技论文，2018，13(13)：1 526–1 532.(AN Xiaofan，LI Ning，SUN Wenbo. Evaluation of toppling deformation for rock slopes based on the discrete element method[J]. China Science Paper，2018，13(13)：1 526–1 532.(in Chinese))
[15] 孙云志，黄润秋. 谷坡岩体卸荷带划分量化指标研究[J]. 岩石力学与工程学报，2012，31(增2)：3 942–3 949.(SUN Yunzhi， HUANG Runqiu. Research on quantification index of rock mass in riverside unloading zone classification[J]. Chinese Journal of Rock Mechanics and Engineering，2012，31(Supp.2)：3 942–3 949.(in Chinese))
|
|
|
|
2020, Vol. 39 
