|
|
|
| Study on sudden departure mechanism of low-potential energy landslides on account of massing energy by spoon-shape terrain—Taking the landslide of Hong?ao Village construction solid waste landfill in Guangming New District of Shenzhen，Guangdong，China as an example |
| ZHONG Xingrong |
| (PowerChina Kunming Engineering Corporation Limited，Kunming，Yunnan 650051，China) |
|
|
|
|
Abstract In order to explore the formation mechanism of long-distance and high-speed movement of low potential energy landslides，a large-scale construction solid waste landslide，that occurred at a landfill at Guangming New District of Shenzhen，Guangdong，China，was selected as the research object. Based on the hypothesis of soil arching，the axis equation of soil arching and strain energy equation accumulated in soil arching are deduced. By catastrophe theory，the transformation and dissipation of the strain energy are analyzed. The starting kinetic energy of the landslide is determined，and according to the kinetic energy theorem，the starting speed of landslide is calculated. In this paper，the energy source of long-distance and high-speed movement of the low potential energy landslide is studied from a new perspective，Research suggests that：(1) Excess pore water pressure provides power for landslide initiation. (2) The special spoon-shape terrain provides topographic condition for the formation of soil arching，The special binary structure slope with dense leading edge and loose posterior edge provided material condition for the formation of soil arching. (3) The deformation of the slope is blocked by the soil arching，forming a stress concentration area，and a huge strain energy is accumulated in the soil arching. (4) The soil arching destroys suddenly，and part of the strain energy is converted into kinetic energy，The landslide starts up with a high speed，that is，the energy of high-speed movement mainly comes from strain energy rather than high potential energy.
|
|
|
|
|
|
[1] YIN Y P，LI B，WANG W P，et al. Mechanism of the December 2015 catastrophic landslide at the Shenzhen landfill and controlling geotechnical risks of urbanization[J]. Engineering，2016，2(2)：230–249.
[2] ROBERTS I. Determination of the vertical and lateral pressures of granular substances[C]// Proceedings of the Royal Society of London. London：[s. n.]，1883：225–240.
[3] TERZAGHI K. Theoretical soil mechanics[M]. Hoboken，USA：John Wiley and Sons，Inc.，1943：216–234.
[4] HEIM A. Landslides and human lives[M]. Vancouver，B C：BiTech Publishers，1932：93–94.
[5] 王兰生，詹 铮，苏道刚，等. 新滩滑坡发育特征和起动、滑动及制动机制的初步研究[C]// 中国典型滑坡. 北京：科学出版社，1986：211–217.(WANG Lansheng，ZHAN Zheng，SU Daogang，et al. Preliminary study on development characteristics and starting, sliding and braking mechanism of Xintan landslide[C]// Typical landslides in China. Beijing：Science Press，1986：211–217.(in Chinese))
[6] 孔纪名，陈自生. 束口形滑坡的运动特征及其在滑坡灾害预测上的意义[C]// 滑坡研究与防治. 成都：四川科学技术出版社，1996：101–108.(KONG Jiming，CHEN Zisheng. A landslide of spoon shape feature of movement and meanting with calculation of landslide disaster[C]// Landslides Research and Control. Chengdu：Sichuan Science and Technology Press，1996：101–108.(in Chinese))
[7] 程谦恭，胡厚田，彭建兵. 侧翼锁固平面旋转式滑坡动力学机制分析[J]. 岩石力学与工程学报，2000，19(5)：634–639.(CHENG Qiangong，HU Houtian，PENG Jianbing. Study on dynamics mechanism of landslide with locked flank in plane rotation[J]. Chinese Journal of Rock Mechanics and Engineering，2000，19(5)：634–639.(in Chinese))
[8] 张金存. 锁固束口形滑坡天然土拱效应作用机制研究[硕士学位论文][D]. 成都：西南交通大学，2017.(ZHANG Jincun. Research on mechanism and effect of natural soil arching on spoon-shape landslides[M. S. Thesis][D]. Chengdu：Southwest Jiaotong University，2017.(in Chinese))
[9] 胡广韬. 动力滑坡学[M]. 西安：陕西科学技术出版社，1988：55–59.(HU Guangtao. The synopsis of dynamic landslidelogy[M]. Xi?an：Shaanxi Science and Technology Press，1988：55–59.(in Chinese))
[10] 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))
[11] 邹宗兴，唐辉明，熊承仁，等. 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)：2 222–2 231.(ZOU Zongxing，TANG Huiming，XIONG Chengren，et al. Geomechanical model of progressive failure for large consequent bedding rock slide and its stability analysis[J]. Chinese Journal of Rock Mechanics and Engineering，2012，31(11)：2 222–2 231.(in Chinese))
[12] 张京伍. 云南头寨大型高速岩质滑坡启程剧动机制研究[硕士学位论文][D]. 成都：西南交通大学，2013.(ZHANG Jingwu. Study on mechanism of set-out violent-slide of Touzhai rock slide in Yunnan Provinces[M. S. Thesis][D]. Chengdu：Southwest Jiaotong University，2013.(in Chinese))
[13] 程谦恭，胡厚田，彭建兵，等. 高边坡岩体渐进性破坏粘弹塑性有限元数值模拟[J]. 工程地质学报，2000，8(1)：25–30.(CHEN Qiangong，HU Houtian，PENG Jianbing，et al. Visco-elastoplastic finite element simulation of progressive failure of high-steep rock slope[J]. Journal of Engineering Geology，2000，8(1)：25–30.(in Chinese))
[14] 潘 岳，王志强，张 勇. 突变理论在岩体系统动力失稳中的应用[M]. 西安：陕西科学技术出版社，1988：143–153.(PAN Yue，WANG Zhiqiang，ZHANG Yong. Application of catastrophe theory in dynamic instability of rock mass system[M]. Xi?an：Shaanxi Science and Technology Press，1988：143–153.(in Chinese))
[15] 高 杨. 人工堆填体滑坡远程滑动机制研究——以深圳光明新区滑坡为例[博士学位论文][D]. 北京：中国地质大学(北京)，2018.(GAO Yang. The study on long run-out mechanism of artificial landfill landslide-- taking Shenzhen Guangming new district landslide as an example[Ph. D. Thesis][D]. Beijing：China University of Geosciences，2018.(in Chinese))
[16] 刘传正. 深圳红坳弃土场滑坡灾难成因分析[J]. 中国地质灾害与防治学报，2016，27(1)：1–5.(LIU Chuanzheng. Genetic mechanism of landslide tragedy happened in Hongao dumping place in Shenzhen，China[J]. The Chinese Journal of Geological Hazard and Control，2016，27(1)：1–5.(in Chinese))
[17] PENG R，HOU Y J，ZHAN L T，et al. Back-analyses of landfill instability induced by high water level：case study of Shenzhen landfill[J]. International Journal of Environmental Research and Public Health，2016，13(1)：126.
[18] ZHAN L T，ZHANG Z，CHEN Y M，et al. The 2015 Shenzhen catastrophic landslide in a construction waste dump：Reconstitution of dump structure and failure mechanisms via geotechnical investigations[J]. Engineering Geology，2018，238：15–26.
[19] KENT P E. The Transport mechanism in catastrophic rock falls[J]. The Journal of Geology，1966，74(1)：79–83.
[20] KENNETH J H. Catastrophic debris streams(Sturzstroms) generated by rockfalls[J]. Geological Society of America Bulletin，1975，86(1)：129–140.
[21] SASSA K. Special lecture：geotechnical model for the motion of landslides：Proc 5th International Symposium on Landslides，Lausanne，10â 15 July 1988V1，P37â 55. Publ Rotterdam：A A Balkema，1988[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1989，26(2)：88.
[22] 李天池，王淑敏. 滑坡运动速度和高速滑坡研究的若干问题[C]// 滑坡研究与防治. 成都：四川科学技术出版社，1996：83–90.(LI Tianchi，WANG Shumin. Some problems of studying landslides velocity and rapid landslides[C]// Landslides Research and Control. Chengdu：Sichuan Science and Technology Press，1996：83–90.(in Chinese))
[23] 钟兴荣. 基于功能定理的高位滑坡运动距离预测方法研究[J]. 工程地质学报，2024，待刊.(ZHONG Xingrong. The study of movement distance forecast method of the Rock avalanche based on Work-energy principle[J]. Journal of Engineering Geology，2024，to be pressed.(in Chinese))
[24] 贾海莉，王成华，李江洪. 关于土拱效应的几个问题[J]. 西南交通大学学报，2003，38(4)：398–402.(JIA Haili，WANG Chenghua，LI Jianghong. Discussion on some issues in theory of soil arch[J]. Journal of Southwest Jiaotong University，2003，38(4)：398–402.(in Chinese))
[25] 王乾坤. 抗滑桩的桩间土拱和临界间距的探讨[J]. 武汉理工大学学报，2005，27(8)：64–67.(WANG Qiankun. Discussion on the soil arching effect and the critical spacing between adjacent anti-slide piles[J]. Journal of Wuhan University of Technology，2005，27(8)：64–67.(in Chinese))
[26] 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，1994：338–339.(ZHANG Zhuoyuan，WANG Shitian，WANG Lansheng. Principle of engineering geology analysis[M]. Beijing：Geological Publishing House，1994：338–339.(in Chinese)
|
|
|
|
2024, Vol. 43 
