第39参第3期 2017年6月
土水建筑与环境工程
Journal of Civil,Architectural &.Environmental Engineering
doi:10.11835/j.issn.1674-4764.2017.03.018
Vol. 39 No. 3 Jun. 2017
可
尚
含水率和颗粒级配对稍密碎石土抗剪性能及
地基承载力的影响卢黎1，王华飞1，胡岱文
(1.重庆大学土木工程学院；山地城镇建设与新技术教育部重点实验室（重庆大学），重庆400045：
2.重庆房地产职业学院，重庆401331)
摘要：碎石土因特殊的工程特性而被科研人页关注，但对大粒径、粉质粘土填充、稍密状态下辞石土的力学性能涉足较少。根据该类型碎石土特点及大量勘察结果配置出两种比较典型级配的稍密碎石土，通过大型直剪试验仪测定了不同含水率状态下辞石土试样的抗剪强度，绘制剪应力与水平位移的关系图，通过一元回归得出稍密碎石的抗剪强度指标C、9值，分析了不同含水率、不同级配对稍密辞石土抗剪性能的影响。结果表明：随着含水率的增大，障石土粘聚力总体呈减小超势，位变化趋势其有显著的阶段性且和粉质粘土的含量有关，含水率变化对辞石土内厚擦角的影响较小。用规范推荐方法计算了该类型碎石土地基承载力，并与地方规范经验取值和勘察工程实践取值进行了对比，结果表明：含水率对地基承载力影响较大，且与碎石土填充物的粉质粘土含量有关，粉质粘土含量越高，承载力影响越大。
关键词：粉质粘土碎石；含水率；抗剪强度；地基承载力
中图分类号：TU472.1
文献标志码：A
文章编号：1674-4764(2017)03-0138-07
Influence of moisture content and grain composition on shear strength
of slightly dense gravel soil and bearing capacity of foundation
Lu Li'，Wang Huafei',HuDaiwen
(l. College of Civil Engineering; Key Laboratory of New Technology for Construction of Cities in Mountain Area (Chongqing University), Ministry of Education, Chongqing University, Chongqing
400045, P. R. China; 2. Chongqing Real Estate College, Chongqing 401331,P. R. China)
Abstract:Because of the special engineering characteristics of the gravel soil, it causes more and more attention. However, there are less research about the mechanical properties of the crushed stone soil with large particle size, silty clay and slightly dense state. According to the characteristics of this type of gravel soil and the results of statistical survey, two typical gradation of slightly dense gravel soil are determined, The shear strength of gravel soil specimen under different moisture content is measured by large direct shear apparatus, and the relationship diagram of the shear force and the horizontal displacement under different water cut rate is drawn. The shear strength indexes c+ g value are determined by univariate
收稿日期：2016-05-10
基金项目：中央高校基本科研业务费（106112014CDJZR200010）
作者简介：卢黎（1977-），男，博士，副教授，主要从事岩土工程研究，（E-mail)644607979@qq.com。 Received : 2016-05-10
Foundation item: the Fundamental Research Funds for the Central Univesities(No. 106112014CDJZR200010)
Author brief:Lu Li(1977-) ,PhD, associate professor,main research interest: geotechnical engineering, (E-mail) 644607979
qq.com.
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