Dissertation > Astronomy,Earth Sciences > Geology > Hydrogeology and Engineering Geology > Engineering Geology > The geological and engineering geological

The Mechanism Research on the Fluidization of the Landslide Translating into Debris Flow

Author XuFuQiang
Tutor ChengQianGong
School Southwest Jiaotong University
Course Geological Engineering
Keywords Slope residual soil Direct shear tests Dynamic triaxial test Fluidization Dynamic Strength Pore ??water pressure Rainstorm landslide Debris flow of Failure mechanism
CLC P642.2
Type Master's thesis
Year 2003
Downloads 391
Quotes 4
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Summary the tropical slope eluvium land area rainstorm landslide debris flow into the status and progress based on the engineering properties of soil on the slope residues of Yunnan Dongchuan City Jiangjiagou Area, heavy rain under the conditions of the slope failure mechanism of soil, heavy rain landslide into the formation mechanism of the debris flow and the formation process of a more systematic study. Soil samples in the indoor particle analysis, penetration, direct shear, dynamic triaxial test; direct shear test results, analysis of the slope soil shear strength index variation in the case of different water content. The test results show that, with the water content of the sample of the different particle size distribution of the shear strength index variations, but were shown a decline in the overall trend. Through dynamic triaxial test analysis of the dynamic strength with the variation of the number of vibrations, the pore water pressure moving charge under the law of development, dynamic elastic modulus (dynamic shear modulus) and damping under dynamic load variation application The transient fluctuation theory to establish a computational model of the development of a computational model of the dynamic strength of saturated soil and pore water pressure, and the establishment of a model of qualitative validation. On the basis of previous work, combined with the test results, and analysis of the saturated soil liquefaction mechanism and its influencing factors, the main discussion of soil conditions (including the sample density, particle characteristics, consolidation time, overconsolidated their structural) and initial effective consolidation pressure. On the basis of the field survey, combined with the test results analysis, preliminary draw the pattern of destruction of natural slopes, including the rotary sliding, translational sliding and soil flow; landslide into a debris flow impact factors and the detritus of movement and heavy rain The distance made a qualitative analysis; preliminary analysis of the landslide into a debris flow fluidized mechanism. The test results show that soil physical properties in the undrained shear test in the stress-strain relationship reached its peak strength basic ideal plastic. In the relative position of the critical state line in accordance with the state of the slope soil soil is divided into two types of dilatancy dilatancy, and both soil failure mechanism and failure process under rainfall conditions were analyzed. The destruction of the the slope residual soil slopes Jiangjiagou rainstorm conditions under is caused due to rainfall infiltration of soil dilatancy destruction, destruction of the pore water pressure of the soil mass behind increased formation of excess pore water pressure, reduced soil strength, rapid destruction expansion due to a consequence, most of the slopes were streaming slip damage and has characteristics of sudden destruction. The stress-strain characteristics of the soil that due to soil failure is not static liquefaction mechanism.

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