| 降雨入渗条件下非饱和膨胀土边坡原位监测 |
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| 引用本文： | 詹良通,吴宏伟,包承纲,龚壁卫.降雨入渗条件下非饱和膨胀土边坡原位监测[J].岩土力学,2003,24(2):151-158. |
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| 作者姓名： | 詹良通 吴宏伟 包承纲 龚壁卫 |
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| 作者单位： | 1.香港科技大学土木工程系，香港；2. 长江科学院土工所， 湖北 武汉 430079 |
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| 基金项目： | 香港政府研究基金委员(RGC)资助项目(No. HKUST6087/ 00E) |
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| 摘 要： | 为了对降雨诱发的非饱和膨胀土边坡失稳的机理有较深入的了解，在湖北枣阳选取了一个11 m高的典型的非饱和膨胀土挖方边坡进行人工降雨模拟试验和原位综合监测。监测成果表明：降雨入渗造成2 m深度以内土层中孔隙水压力和含水量大幅度增加，致使膨胀土体的抗剪强度由于有效应力的减少及土体吸水膨胀软化而降低；同时，降雨入渗造成土体中水平应力与竖向应力比显著增加，并接近理论的极限状态应力比，以致软化的土体有可能沿着裂隙面发生局部被动破坏，此破裂面在一定条件下（如持续降雨条件下）可能会逐渐扩展，最后发展成为膨胀土中常见的渐进式滑坡。
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| 关 键 词： | 膨胀土边坡 降雨入渗 现场监测 孔隙水压力 土压力 变形 |
| 文章编号： | 1000-7598-(2003)02-0151-08 |
| 收稿时间： | 2002-11-29 |
| 修稿时间： | 2002年11月29 |
Artificial rainfall infiltration tests on a well-instrumented unsaturated expansive soil slope |
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| ZHAN Liang-tong,NG Wang-wai Charles,BAO Cheng-gang,GONG Bi-wei.Artificial rainfall infiltration tests on a well-instrumented unsaturated expansive soil slope[J].Rock and Soil Mechanics,2003,24(2):151-158. |
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| Authors: | ZHAN Liang-tong NG Wang-wai Charles BAO Cheng-gang GONG Bi-wei |
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| Institution: | 1. The Hong Kong University of Science and Technology, Hong Kong; 2. Yangtze River Scientific Research Institute, Wuhan 430010, China |
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| Abstract: | To improve our understanding of the fundamental mechanism of rain-induced landslides in unsaturated expansive soils, artificial rainfall simulation tests were carried out on an 11 m high cut slope in a typical medium-plastic expansive clay in Hubei of China. The slope was well-instrumented with tensiometers, thermal conductivity suction sensors, moisture probes, earth pressure cells, inclinometers, a tipping bucket rain gauge, a vee-notch flow meter and an evaporimeter. Two artificial rainfall events were created during a month of field investigation and monitoring. Monitored results demonstrate: rainfall infiltration leads to a significant increase in pore-water pressure and water content within the top 2 m soil layer, which may result in a reduction of shear strength due to a decrease in effective stress and wetting-induced softening. On the other hand, rainfall infiltration causes a significant increase in total stress ratio (sh/sv), which may lead to a local passive failure and then trigger a progressive slope failure under a continuous rainfall condition. |
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| Keywords: | expansive soil slope rainfall infiltration in-situ monitoring pore water pressure earth pressure deformation |
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