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| MACRO-MESO ANALYSIS OF WATER-SOIL INTERACTION MECHANISM OF DEBRIS FLOW STARTING PROCESS |
| GAO Bing1，ZHOU Jian1，2，ZHANG Jiao3 |
| (1. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education，Tongji University，Shanghai 200092，China；2. Department of Geotechnical Engineering，Tongji University，Shanghai 200092，China；3. School of Civil Engineering and Transportation，Shanghai Technical College of Urban Management，Shanghai 200432，China) |
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Abstract Using the self-developed small-scale model flume，combined with the controllable intensity artificial rainfall simulator，the experiment of debris flow induced by artificial rainfall is carried out to study the influence of rainfall intensity on debris flow starting progress. Based on molar heat capacity principle，precise measuring instrument PF-Meter is used to measure variation relation of matrix suction with water content；and pore water pressure gauge is used to measure the performance of pore water pressure during rainfall process. Based on the water-soil interaction mechanism combining with the changes of pore water pressure and matrix suction，the macro influencing factors of debris flow are analyzed. Using the CCD camera and software GeoDip，motion characteristics of sand particles in sandy soil and water-soil interaction mechanism of debris flow are both studied from microscopic view，which indicate that the motion of sand particle under the action of rain is the main influencing factor of water-soil interaction mechanism during the starting process of debris flow.
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Received: 21 June 2011
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LIANG Binqi1, YANG Dongxu1, 2*, ZONG Xin1, WAN Fangkai1, ZHANG Wenwen1, LU Shuai3, LIU Yulin4, WANG Dongpo2. Risk regulation of debris-flow damming and back-silting amidst bridge clearance limits and retention-drainage coordination[J]. , 2026, 45(5): 1365-1377. |
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2011, Vol. 30 
