| 高速滑坡形成机制： 土粒子破碎导致超孔隙水压力的产生 |
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| 引用本文： | 汪发武.高速滑坡形成机制： 土粒子破碎导致超孔隙水压力的产生[J].吉林大学学报(地球科学版),2001,31(1):64-69. |
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| 作者姓名： | 汪发武 |
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| 作者单位： | 吉林大学 环境 与建设工程学院，吉林 长春 130026;日本金泽大学 工学部，92 0-8667 |
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| 摘 要： | 通过排水剪切试验，揭示出易于产生粒子破碎的土体易于产生体积变化，土体初始结构和粒子破碎难易度对体积变化各阶段的影响。在与之相对应的不排水试验中，产生粒子破碎的土体最终产生了较高的超孔隙水压力，而且孔隙水压力产生的各阶段与排水试验中的体积变化阶段具有良好的对应关系。揭示了不同诱因产生的高速滑坡的共同特征，即在长距离运动中，由于粒子破碎的影响，滑动面土体在不排水条件下，抗剪强度因超孔隙水压力上升而下降，最终导致高速滑坡。同时，由于粒子破碎将导致土体自身渗透系数降低，土粒子破碎因而具有促进超孔隙水压力产生和减缓超孔隙水压力消散的双重效果。
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| 关 键 词： | 滑坡 环剪试验 粒子破碎 超孔隙水压力 |
| 文章编号： | 1008-0058(2001)01-0064-06 |
| 修稿时间： | 2000年4月17日 |
MECHANISM OF RAPID LANDSLIDES：EXCESS PORE PRESSURE GENERATION CAUSED BY GRAIN CRUSHING |
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| WANG Fa_wu.MECHANISM OF RAPID LANDSLIDES：EXCESS PORE PRESSURE GENERATION CAUSED BY GRAIN CRUSHING[J].Journal of Jilin Unviersity:Earth Science Edition,2001,31(1):64-69. |
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| Authors: | WANG Fa_wu |
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| Abstract: | The consolidated-drained ring-shear test method was used to investigate the grain crushing susceptibility of samples, while the consolidated-undrained ring shear test was used to investigate the excess pore pressure generation properties. Under the undrained test, excess pore pressure was generated faster and reached higher value at steady state on the sample that has higher grain crushing susceptibility. The test results of sample height change in the drained tests are well related to the excess pore pressure ratio in the undrained tests. From the example studies a universal property of high-speed landslides with long distance movement was found, of which the shear resistance decrease along with the increase of pore pressure due to the effect of soil grain crushing. During shearing, a new structure of soil formed due to the decrease of the permeability coefficient. With this structure, excess pore pressure is generated and accumulated easily, while difficult to dissipate. |
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| Keywords: | landslide ring-shear test grain crushing excess pore pressure |
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