摘要
盐岩的抗拉强度是盐穴储气工程中的一个重要参数,由于直接拉伸试验对试验装置和岩石试件的要求较高,导致其测试难度较大,需要探索一种试验简单、测试准确的方法来获得抗拉强度。为此,本文针对盐岩开展了直接拉伸试验、简化ISRM标准巴西试验、中国标准巴西试验和三点弯曲试验,分析了基于不同试验获得的盐岩抗拉强度及拉伸破坏过程中的声发射(AE)特性。结果表明拉伸试验方法对盐岩抗拉强度以及声发射计数、能量和空间分布特征具有显著影响。对比基于不同试验方法得到的抗拉强度及盐岩拉伸破坏特征发现,三点弯曲试验测定的间接抗拉强度与直接抗拉试验测定的抗拉强度更为接近,因此三点弯曲试验可作为除直接抗拉试验外测定盐岩抗拉强度的较好选择。
The tensile strength of rock salt is an important parameter in the salt cavern gas storage project.Due to the high requirements for experimental setup and rock specimens in the direct tensile test,it is necessary to find another alternative to obtain the tensile strength.Therefore,the tensile strength and acoustic emission(AE)characteristics obtained by the direct tensile test,Brazilian test with simplified ISRM standard,Brazilian test with China standard,and three-point-bending test were discussed in this paper.It is noticed that the tensile testing method has an effect on the tensile strength of rock salt and the AE counts,energy and spatial distribution.Based on the tensile strength determined by three-point-bending test and the AE evolution characteristics,the indirect tensile strength determined by three-pointbending test was much closer to the tensile strength determined by direct tensile test,meaning that the three-pointbending test could be considered as a good option to obtain the tensile strength of rock salt except direct tensile test.
作者
刘建锋
王春萍
王璐
冉莉娜
邓朝福
LIU Jian-feng;WANG Chun-ping;WANG Lu;RAN Li-na;DENG Chao-fu(State Key Laboratory of Hydraulics and Mountain River Engineering,Sichuan University,Chengdu 610044,China;Beijing Research Institute of Uranium Geology,Beijing 100822,China;School of Architecture and Civil Engineering,Xihua University,Chengdu 610039,China;CNPC Key Laboratory of Oil and Gas Underground Storage Engineering,Langfang 065007,China)
基金
Projects(2022YFSY0007, 2021YFH0010) supported by the Scientific and Technological Research Projects in Sichuan Province, China。
关键词
盐岩
抗拉强度
声发射
破坏特征
rock salt
tensile strength
acoustic emission
damage evolution
