不同应变率下干、湿岩石的强度特性（英文）

发布时间：2018-01-25 21:19

本文关键词： 岩石强度应变率饱水岩石　出处：《Transactions of Nonferrous Metals Society of China》2016年07期 　论文类型：期刊论文

【摘要】：水和加载条件对岩石材料的强度有很大的影响,但高应变率下饱水岩石的动态特性研究仍十分缺乏。通过对干燥和饱水砂岩进行压缩试验,发现:干燥和饱水砂岩的动态压缩强度都随着应变率的增加而增大,且饱水岩石表现出更强的率相关性。引入干燥岩石强度与饱水岩石强度的比值(水影响因子WAF)来描述不同应变率下水对岩石压缩强度的影响。在静态压缩条件下WAF约为1.38,随着应变率的增加WAF不断减小。当应变率达到190 s~(-1)时,WAF减小至0.98,表明高应力率时饱水岩石的压缩强度可以大于干燥岩石的压缩强度。进而,基于滑移裂纹模型,讨论了水和应变率对岩石特性的双重影响,为实验结果提供了较好解释。
[Abstract]:Water and loading conditions have great influence on the strength of rock materials, but the study of dynamic characteristics of saturated rocks at high strain rate is still very lacking. The compression tests of dry and saturated sandstone are carried out. It is found that the dynamic compressive strength of dry and saturated sandstone increases with the increase of strain rate. The ratio of dry rock strength to saturated rock strength was introduced (water influence factor WAF). The WAF is about 1.38 under static compression. With the increase of strain rate, the WAF decreases to 0.98 when the strain rate reaches 190sm ~ (-1). The results show that the compressive strength of saturated rock at high stress rate can be greater than that of dry rock. Furthermore, based on the sliding crack model, the double effects of water and strain rate on rock characteristics are discussed. It provides a good explanation for the experimental results.
【作者单位】：中南大学资源与安全工程学院;
【基金】：Project(2015CB060200)supported by the National Basic Research Program of China Projects(51322403,51274254)supported by the National Natural Science Foundation of China Projects(2015cx005,2016cx017)supported by Innovation Plan of Central South University
【分类号】：TU45
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