| 陕西华县高楼村黄土滑坡泥流的成因分析 |
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| 引用本文： | 蔺晓燕, 李同录, 张子然, 赵纪飞, 汪发武, 张紫航. 2013: 陕西华县高楼村黄土滑坡泥流的成因分析. 工程地质学报, 21(2): 282-288. |
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| 作者姓名： | 蔺晓燕 李同录 张子然 赵纪飞 汪发武 张紫航 |
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| 作者单位： | 1.长安大学地质工程系 西安 710054;;2.国立岛根大学综合理工学部地球科学部 岛根 690-8504, 日本 |
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| 基金项目： | 国家自然科学基金资助项目(40972182) |
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| 摘 要： | 滑坡泥流具有高速远程运动的特点,一般先形成滑坡,随即转为高速泥流,虽不多见,但破坏性大。陕西华县高楼村黄土滑坡泥流是一个由于引水渠漏水引起的典型案例。对滑坡形成区后壁黄土的物理性质测试表明,可转化为泥流的滑坡具有疏松的结构,一般饱和含水率大于液限。对其在饱和状态的三轴固结不排水试验表明,试样在很小应变下发生剪缩,产生较高的超孔隙水压力,超孔隙水压力达到一定程度,使其由固态转化为流态,从而形成快速、远距离的流动。当边坡被引水渠渗漏的水浸湿,潜在滑带几乎处于饱和时,在静水压力作用下,其稳定性接近临界状态; 一旦开始破坏,剪力作用下疏松的结构发生剪缩,沿滑动带产生较高的超静孔隙水压力,导致滑带呈流态高速下滑,此时的滑带只有很低的强度,因此沿着坡度较陡的沟底保持高速流动,到沟口平坦处势能完全释放后才停滞。用Sassa K.滑坡运动模型,对该滑坡的运动过程模拟,模拟结果与现场实测滑坡发生后的地形较为一致。
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| 关 键 词： | 滑坡 泥流 黄土 孔隙水压力 |
| 收稿时间： | 2012-09-10 |
| 修稿时间： | 2013-01-07 |
CAUSES OF GAOLOUCUN LOESS FLOWSLIDE IN HUAXIAN COUNTY,SHAANXI PROVINCE |
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| LIN Xiaoyan, LI Tonglu, ZHANG Ziran, ZHAO Jifei, WANG Fawu, ZHANG Zihang. 2013: CAUSES OF GAOLOUCUN LOESS FLOWSLIDE IN HUAXIAN COUNTY, SHAANXI PROVINCE. JOURNAL OF ENGINEERING GEOLOGY, 21(2): 282-288. |
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| Authors: | LIN Xiaoyan LI Tonglu ZHANG Ziran ZHAO Jifei WANG Fawu ZHANG Zihang |
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| Affiliation: | 1.Department of Geological Engineering, Chang'an University, Xi'an 710054;;2.Department of Geosciences, Interdisciplinary Faculty of Science and Engineering, Shimane University, Shimane 690-8504, Japan |
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| Abstract: | Rapid loess flowslides induced by irrigation often occur in the loess irrigation area, which have resulted in serious damages to farmlands, residential houses and loss of lives. A typical case of the Gaolou flowslide in Guanzhong irrigation area, Shaanxi Province of China, was investigated. Laboratory tests suggest that the loess flowslide had a loose structure and that the saturated water content was higher than the liquid limit. As the loess slope started to fail, the saturated loess of the sliding zone quickly fluidized and then flowed on the relative dry-hard path because the loess structure was damaged by the shear force to produce a high excess pore pressure in the lower portion of the displaced mass. Excess pore pressure was produced between the displaced mass and the ground surface because of pore pressure dissipation on the dry ground. So the shearing zone was within the lower portion of the displaced mass other than on the ground surface, which made part of the displaced mass cohere on the ground as observed at the site. The triaxial tests for the loess specimens suggest that fluidization occurred at the source area in the beginning and maintains in the moving process, which produced a quick and long run-out flow. The modified Sassa K.simulation model for landslide motion is applied to simulate the motion scenarios of this case. And the simulated results fit the actual ones of site investigation. |
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| Keywords: | Landslide Flowslide Loess Pore water pressure |
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