水对三峡库区碎石土的弱化作用

›› 2005, Vol. 26 ›› Issue (11): 1857-1861.

水对三峡库区碎石土的弱化作用

刘文平，时卫民，孔位学，郑颖人

后勤工程学院军事土木工程系，重庆 400041

收稿日期:2004-05-28 出版日期:2005-11-10 发布日期:2014-01-03
作者简介:刘文平，男，1979年生，硕士研究生，主要从事岩土工程稳定性方面的研究。

Weakening effect of water on gravel-soil in Three Gorges Reservoir area

LIU Wen-ping, SHI Wei-min, KONG Wei-xue, ZHENG Ying-ren

Department of Civil Engineering, Logistical Enginery University, Chongqing 400041, China

Received:2004-05-28 Online:2005-11-10 Published:2014-01-03

摘要/Abstract

摘要： 通过筛分试验对三峡库区现场取得的碎石土确定平均级配，然后用代替法设计其试验级配。结合碎石土的特点，采用细粒土含量控制试样的含水量，在同一竖向压力下制样。通过对库区不同含水量和不同含石量碎石土的剪切强度及参数的研究，结果表明，含水量不同，碎石引起强度变化的临界含石量也不同；碎石含量不变时，c值随含水量变化幅度不大，但值随含水量变化会有较大变化；碎石土从天然状态到饱和状态，内摩擦角依据碎石含量不同，可降3°～10°左右。为估计三峡库区蓄水后旱桥桥基与路基承载力的降低提供了依据。

关键词: 碎石土, 弱化, 含水量, 抗剪强度

Abstract: The average particle gradation can be obtained after sieving the local gravel-soil from the Three Gorges Reservoir area, and then its experimental particle gradation is designed with replacement method. According to the feature of gravel-soil, the water content of sample is controlled by granule soil content and sampled under the same vertical pressure. The following conclusions are drawn on the shear strength and parameter of gravelly soil with different water contents and different rock contents: with different water contents, the critical rock content with changed strength will be different; with different rock contents, c value changes little with water content, while ? value changes remarkably; the internal friction angle changes with different rock contents, probably reducing by 3° -10° or so, when gravelly soil changes from the original condition to its saturation. These conclusions uill to be a basis for estimating the carrying capacity reduction of overpass and roadbed after the Three Gorges Reservoir filling.

Key words: Three Gorges gravelly soil, weakening, water content, shear strength

中图分类号:

TU 472

刘文平，时卫民，孔位学，郑颖人. 水对三峡库区碎石土的弱化作用[J]. , 2005, 26(11): 1857-1861.

LIU Wen-ping, SHI Wei-min, KONG Wei-xue, ZHENG Ying-ren. Weakening effect of water on gravel-soil in Three Gorges Reservoir area[J]. , 2005, 26(11): 1857-1861.

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