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《Journal of Changchun University of Science and Technology》 2001-01
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MECHANISM OF RAPID LANDSLIDES:EXCESS PORE PRESSURE GENERATION CAUSED BY GRAIN CRUSHING

WANG Fa_wu 1,2 (1.College of Environment and Construction Engineering, Jilin University, Changchun 130026, China; 2.Department of Civil Engineering, Kanazawa University, Japan)  
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.
【CateGory Index】: P642.22
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