不同掺砾量下砾石土抗拉强度试验研究

吉恩跃; 陈生水; 朱俊高; 傅中志

doi:10.11779/CJGE201907019

不同掺砾量下砾石土抗拉强度试验研究 English Version

吉恩跃^1,2,3,
陈生水^1,2,
朱俊高³,
傅中志^1,2

1. 南京水利科学研究院岩土工程研究所,江苏南京 210024;
2. 水利部土石坝破坏机理与防控技术重点实验室,江苏南京 210029;
3. 河海大学岩土力学与堤坝工程教育部重点实验室,江苏南京 210024

基金项目: 国家重点研发计划重点专项项目（2017YFC0404806）; 国家自然科学基金项目（51809182,51779152）; 中国博士后科学基金项目（2018M630578）; 中国博士后科学基金特别项目（2019T120444）

详细信息

作者简介:
吉恩跃(1989— ),男,江苏盐城人,博士后,主要从事土石坝工程、粗颗粒土基本性质及本构关系研究。E-mail：eyji@nhri.cn。

中图分类号: TU43
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出版历程
- 收稿日期: 2018-07-11
- 发布日期: 2019-07-24

Experimental research on tensile strength of gravelly soil under different gravel contents

1. Geotechnical Engineering Department, Nanjing Hydraulic Research Institute, Nanjing 210024, China;
2. Key Laboratory of Earth-Rock Dam Failure Mechanism and Safety Control Techniques, Ministry of Water Resources, Nanjing 210029, China;
3. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China

摘要

摘要: 砾石土的抗拉强度是土心墙堆石坝抵抗拉裂破坏的重要指标之一。基于自主研制的单向拉伸试验模具,对不同掺砾量下的砾石土进行了系列的单向拉伸试验。在此基础上得到了以下结论：在本文的试验参数范围内,砾石土的抗拉强度随着含水率的增大而减小,随着干密度的增大而增大;分别给出了各掺砾量下土样抗拉强度与其最优含水率及最大干密度的关系表达式;对于处于各自最优含水率和最大干密度下的砾石土,掺砾量从0%增加到50%时,试样的抗拉强度从122.6 kPa减小到了49.8 kPa,且两者呈线性递减关系;试样的峰值拉应变和极限拉应变均随着掺砾量的增加而线性递减;对不同掺砾量土样的断裂能分析发现,随着掺砾量的增加,土样的抗拉能力不断减弱;在略高于最优含水率及处于最大干密度时砾石土试样的综合抗拉能力最强。相关试验成果可为实际土石坝心墙抗裂设计提供参照。
- 砾石土 /
- 掺砾量 /
- 单向拉伸 /
- 抗拉强度 /
- 拉应变
Abstract: The tensile strength of gravelly soil is one of the important indexes for resisting the cracking of earth core rockfill dams. Based on the self-developed uniaxial tensile test mould, a series of uniaxial tensile tests are carried out on the gravel soil with different gravel contents. Within the range of test parameters, the tensile strength of gravelly soil decreases with the increasing water content and increases with the increase of dry density. The relationship of tensile strength versus the optimum water content and the maximum dry density is presented, respectively. For the gravelly soil with the optimum water content and maximum dry density, as the gravel content increases from 0% to 50%, the tensile strength of specimens decreases from 122.6 kPa to 49.8 kPa linearly. The peak tensile strain and ultimate tensile strain both decrease with the increase of the gravel content. From the fracture energy analysis, it is found that the tensile capacity of gravelly soil decreases slightly with the increase of the gravel content. In the case that the specimens with the maximum dry density and the water content higher than the optimum water content, the comprehensive tensile capacity of the specimens is the strongest. The relevant test results can provide support for the anti-crack design of high earth and rockfill dams.
- gravelly soil /
- gravel content /
- uniaxial tensile test /
- tensile strength /
- tensile strain

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参考文献(13)

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