基于离心模型试验的降雨诱发滑坡宏细观机理研究

doi:10.11779/CJGE2020S1010

摘要
图/表
参考文献
相关文章 (15)

全文: PDF (2204 KB) HTML (1 KB)
输出: BibTeX | EndNote (RIS)

摘要利用同济大学土工离心机,结合自主设计的可控强度降雨模拟器,进行降雨诱发砂土质边坡滑坡的离心机模型试验,研究降雨条件下滑坡发生的宏细观机理。试验过程中,采用高速动态数据采集仪和孔隙水压力传感器进行孔压量测;利用高清数码成像设备采集图像,并结合Geodip软件对滑坡形成过程中土体细观结构变化进行分析。研究结果表明：雨水在坡体内部不同位置的流动和累积,是土体发生滑坡的主要原因。砂土质边坡发生滑坡的宏细观机理为坡体中细颗粒随雨水渗透向坡脚迁移,使坡体内部雨水大量聚集导致孔压上升土体强度降低,当下滑力大于抗剪强度时,上部土体推动下部土体发生整体滑动,形成滑坡。

	服务

	把本文推荐给朋友
	加入我的书架
	加入引用管理器
	E-mail Alert
	RSS
	作者相关文章
	杜强
	周健

关键词 ：边坡失稳, 离心模型试验, 渗透系数, 宏细观机理

Abstract：By using the geotechnical centrifuge of Tongji University and combining with an artificial rainfall simulator which is designed to control the rainfall intensities, the centrifugal model tests are carried out to study the macro-mesoscopic formation mechanism of cohesionless soil slope failure induced by rainfall. During the test processes of slope failure, the pore pressure is measured by the high-speed dynamic data acquisition instrument and the precise pore water pressure sensor. Using the HD digital imaging equipment and the mesoscopic structure analysis software Geodip, the variation laws of soil microstructure during the formation of landslide are analyzed. The results show that the permeation and cumulation of rainwater in the slope body is regarded as the main cause of slope failure. The formation mechanism of landslide is the motion of the fine particles with migratation of pore water in the slope. The gathering of rain at the inner slope body causes the increase of pore pressure and the reduction of soil strength, and then the whole sliding occurs when the sliding force exceeds the shear strength of soil.

Key words： slope failure centrifugal model test permeability coefficient macro-mesoscopic mechanism

收稿日期: 2020-06-01

ZTFLH:

P642.2

基金资助:内蒙古自治区自然科学基金项目（2018BS05015）; 内蒙古工业大学科学研究项目（BS202044）

作者简介: 杜强（1987— ）,男,博士,讲师,主要从事土体宏细观力学机理及离散元数值模拟方面的研究。E-mail：dq410@imut.edu.cn。

引用本文:

杜强, 周健. 基于离心模型试验的降雨诱发滑坡宏细观机理研究[J]. 岩土工程学报, 2020, 42(S1): 50-54. DU Qiang, ZHOU Jian. Centrifugal model tests on slope failure induced by rainfall. Chinese J. Geot. Eng., 2020, 42(S1): 50-54.

链接本文:

http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/10.11779/CJGE2020S1010 或 http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/Y2020/V42/IS1/50

[1] 陈晓清, 崔鹏, 冯自立, 等. 滑坡转化泥石流起动的人工降雨试验研究[J]. 岩石力学与工程学报, 2006, 25(1): 106-116.
(CHEN Xiao-qing, CUI Peng, FENG Zi-li, et al.Artificial rainfall experimental study on landslide translation to debris flow[J]. Chinese Journal of Rock Mechanics and Engineering, 2006, 25(1): 106-116. (in Chinese))
[2] 胡明鉴, 汪稔, 张平仓. 斜坡稳定性及降雨条件下激发滑坡试验研究[J]. 岩土工程学报, 2001, 23(4): 454-457.
(HU Ming-jian, WANG Ren, ZHANG Ping-cang.Primary research on the effect of rainfall on landslide[J]. Chinese Journal of Geotechnical Engineering, 2001, 23(4): 454-457. (in Chinese))
[3] 林鸿州. 降雨诱发土质边坡失稳的试验与数值分析研究[D]. 北京: 清华大学, 2007.
(LIN Hong-zhou.The Study on the Mechanism and Numerical Analysis of Rainfall-Induced Soil Slope Failure[D]. Beijing: Tsinghua University, 2007. (in Chinese))
[4] HUANG C C, JU Y J, HWU L K, et al.Internal soil moisture and piezometric responses to rainfall-induced shallow slope failures[J]. Journal of Hydrology, 2009, 370: 39-51.
[5] 胥勋剑, 杨强. 黄莲树滑坡形成机理及稳定性分析[J]. 工程勘察, 2014, 42(8): 6-9.
(XU Xun-jian, YANG Qiang.Formation mechanism and stability analysis of Huanglianshu landslide[J]. Geotechnical Investigation ＆ Surveying, 2014, 42(8): 6-9. (in Chinese))
[6] 陈剑, 安孟可, 龙维, 等. 云南汤家山松散堆积层滑坡滑带土的微观结构与机理分析[J]. 工程勘察, 2015, 43(1): 5-10, 25.
(CHEN Jian, AN Meng-ke, LONG Wei, et al.Microstructure and mechanism analysis on the slip zone soil of Tangjiashan loose deposits landslide in Yunnan province[J]. Geotechnical Investigation ＆ Surveying, 2015, 43(1): 5-10, 25. (in Chinese))
[7] WANG F W, SHIBATA H.Influence of soil permeability on rainfall induced flow slides in laboratory flume tests[J]. J of Can Geotech, 2007, 44: 1128-1136.
[8] 张敏, 吴宏伟. 边坡离心模型试验中的降雨模拟研究[J]. 岩土力学, 2007, 28(增刊1): 53-57.
(ZHANG Min, WU Hong-wei.Rainfall simulation techniques in centrifuge modelling of slopes[J]. Rock and Soil Mechanics, 2007, 28(S1): 53-57. (in Chinese))
[9] 钱纪芸, 张嘎, 张建民. 离心场中边坡降雨模拟系统的研制与应用[J]. 岩土工程学报, 2010, 32(6): 838-842.
(QIAN Ji-yun, ZHANG Ga, ZHANG Jian-min.Development of rainfall simulation system for centrifugal model tests[J]. Chinese Journal of Geotechnical Engineering, 2010, 32(6): 838-842. (in Chinese))
[10] 姚裕春, 姚令侃, 袁碧玉. 降雨条件下边坡破坏机理离心模型研究[J]. 中国铁道科学, 2004, 25(4): 64-69.
(YAO Yu-chun, YAO Ling-kan, YUAN Bi-yu.Analysis of a centrifugal model of slope damage mechanism during rainfall[J]. China Railway Science, 2004, 25(4): 64-69. (in Chinese))
[11] 杨春宝, 朱斌, 孔令刚, 等. 水位变化诱发粉土边坡失稳离心模型试验[J]. 岩土工程学报, 2013, 35(7): 1261-1272.
(YANG Chun-bao, ZHU Bin, KONG Ling-gang, et al.Centrifugal model tests on failure of silty slopes induced by change of water level[J]. Chinese Journal of Geotechnical Engineering, 2013, 35(7): 1261-1272. (in Chinese))
[12] 王维早, 许强, 郑光, 等. 强降雨诱发缓倾堆积层边坡失稳离心模型试验研究[J]. 岩土力学, 2016, 37(1): 87-95.
(WANG Wei-zao, XU Qiang, ZHENG Guang, et al.Centrifugal model tests on sliding failure of gentle debris slope under rainfall[J]. Rock and Soil Mechanics, 2016, 37(1): 87-95. (in Chinese))