含水率对砂岩动态拉伸强度的影响

赵建平; 王明虎; 赵奕翰

doi:10.11872/j.issn.1005-2518.2019.02.216

黄金科学技术 >

2019 , Vol. 27 >Issue 2: 216 - 222

DOI: https://doi.org/10.11872/j.issn.1005-2518.2019.02.216

采选技术与矿山管理

含水率对砂岩动态拉伸强度的影响

赵建平 ,
王明虎 ,
赵奕翰

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1. 中南大学资源与安全工程学院，湖南长沙 410083
2. 中南勘测设计研究院有限公司，湖南长沙 410014

赵建平（1977-），男，甘肃宕昌人，博士，副教授，从事爆炸波和岩土工程方面的研究工作。jpzcsu@126.com|王明虎（1992-），男，山东威海人，硕士研究生，从事岩土与爆破研究工作。283223174@qq.com

收稿日期: 2018-03-15

修回日期: 2018-05-03

网络出版日期: 2019-04-30

基金资助

国家自然科学基金青年基金项目“岩体中爆炸波识别及其动力学耦合效应研究”（编号：51104178）和国家重点研发计划项目“湖南省通天玉产业化开发的关键技术研究”(编号：2015SK2086)

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Influence of Moisture Content on Dynamic Tensile Strength of Sandstone

Jianping ZHAO ,
Minghu WANG ,
Yihan ZHAO

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1. School of Resources and Safety Engineering，Central South University，Changsha 410083，Hunan，China
2. Power China Zhongnan Engineering Corporation Limited，Changsha 410014，Hunan，China

Received date: 2018-03-15

Revised date: 2018-05-03

Online published: 2019-04-30

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摘要

工程中的岩石具有不同的含水性，研究不同含水率岩石动态力学性质的变化规律，对岩石工程的设计和建设具有很强的指导意义。为研究不同含水率对砂岩动态拉伸强度的影响，利用霍普金森压杆（SHPB）试验装置对不同含水率试样进行了一系列动态巴西劈裂试验，研究了不同含水率砂岩在不同加载率条件下的动态拉伸强度变化规律。试验结果表明：岩石的动态拉伸强度随着加载率的增加而增加，其率相关性与含水率有关，饱和试样的率相关性较强，而干燥岩石的动态强度对加载率的变化不敏感。当加载率较低时，岩石的拉伸强度随着含水率的增加而降低；当加载率较高时，由于水的Stefan效应，水对岩石裂纹产生抗力，阻碍其扩展，导致岩石强度增加，饱和试样的动态拉伸强度出现高于非饱和试样强度的现象。

关键词： 含水率; 加载率; 砂岩; 动态拉伸强度; SHPB; 巴西劈裂; 率相关性; Stefan效应

本文引用格式

赵建平 , 王明虎 , 赵奕翰 . 含水率对砂岩动态拉伸强度的影响[J]. 黄金科学技术, 2019 , 27(2) : 216 -222 . DOI: 10.11872/j.issn.1005-2518.2019.02.216

Abstract

The rocks in the project have different water content.It is important for the design and construction of rock engineering to carry out research on the dynamic mechanical properties of different water content rocks.In order to study the effect of different moisture content on the dynamic tensile strength of sandstone，a series of dynamic Brazil split tests were carried out for the samples in different moisture content by using the Hopkinson pressure bar （SHPB） test device，and the dynamic tensile strength change rule of sandstone with different moisture content under different loading rates was studied.Experimental results show that：The dynamic tensile strength of the rock as loading rate increases，rate dependence is related to the moisture content，rate dependence of saturated sample is stronger，while the dynamic strength of the dry rock is not sensitive to the change in rate of loading.When loading rate is lower，the tensile strength of the rock decreases with the increase of moisture content.When loading rate is higher，because the water Stefan effect results in that the resistance to rock crack generated by the water impeded its expansion，which leads to the increase of rock strength，so that the dynamic tensile strength of saturated sample is higher than that of unsaturated sample.

Key words： moisture content; loading rate; sandstone; dynamic tensile strength; SHPB; Brazilian splitting; strain rate dependence; Stefan effect

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