[an error occurred while processing this directive] 高校地质学报 2018, 24(4) 619- DOI:     ISSN: 1006-7493 CN: 32-1440/P

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本文关键词相关文章
滑带土
剪切速率
细粒含量
残余强度
本文作者相关文章
董文萍
戴福初
张洪影
黄志全
PubMed
Article by Dong W
Article by Dai F
Article by Zhang H
Article by Huang Z
向家坝水电站库区某滑坡滑带土的残余强度试验研究
董文萍,戴福初, 张洪影,黄志全
摘要: 利用DTA-138型环剪仪对向家坝水电站库区某滑坡滑带土重塑样开展了大位移剪切条件下的环剪试验,探讨了剪切速
率(小于100 mm/min)、细粒(<0.075 mm)含量对残余强度的影响,对比分析了原状样滑面和重塑样剪切面的细粒含量变化以
及微观结构差异。研究结果表明:滑带土的原状样滑面细粒含量高于滑带,重塑样剪切面细粒含量高于剪切面上下区域;当剪
切速率由0.109 mm/min增大到98mm/min时,残余强度应力比的变化呈现先减后增的凹型,在1.09 mm/min时达到最小值(重塑
样Rr-1#,Rr-4#,Rr-5#残余强度应力比最小值分别为0.34,0.42,0.39);残余强度随细粒含量的增加先增大后减小,呈二次多项
式关系,其临界值约为56%;随着细粒含量的增加,残余强度变化幅度随法向应力的增加而增大。
关键词 滑带土   剪切速率   细粒含量   残余强度  
Laboratory Study on Soil Residual Strength of Slip Zone of A Landslide in the Xiangjiaba Reservoir Area
DONG Wenping, DAI Fuchu, ZHANG Hongying, HUANG Zhiquan
Abstract: In order to study the effect of shear rate (less than 100 mm/min) and fine grains (less than 0.075 mm) content on residual
strength of the slip zone of a landslide in the Xiangjiaba reservoir area, ring shear tests were conducted on remolded slip zone soil using
the DTA-138 ring shear apparatus, the fine grains content and microstructure of slikensided surface of undisturbed samples and shear
surface of remolded samples were comparatively analyzed. It was found that the fine grains content obtained from undisturbed
slikensided surface are larger than that from the slip zone, and the fine grains content obtained from shear surface of remolded samples
are larger than that from area adjacent to the shear surface. With an increase of the rate of shear from 0.109 mm/min to 98 mm/min, the
residual strength stress ratios exhibit a concave pattern, ie. decrease at first and then increase with the lowest mobilized stress ratio at
the 1.09 mm/min (the lowest mobilized stress ratio of Rr-1#, Rr-4#, and Rr-5# remolded samples are 0.34, 0.42 and 0.39 respectively) .
The residual strength first increases and then decreases with increasing fine grains content, exhibiting a quadratic polynomial relation
with a critical value about 56%, and with increasing fine grains content, the range of variations in residual strength increases with
normal stress.
Keywords: slip zone soil   shear rate   fine grains content   residual strength  
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