摘要
盐穴储气库的3种典型岩石为盐岩、泥岩、钙芒硝岩,为了得到3种岩石拉伸状态下的声发射特征参数规律,开展了巴西劈裂试验和声发射试验。结果表明:3种岩石中,盐岩的强度最低,峰值应力为1.27 MPa,不足泥岩的1/2,略低于钙芒硝岩。峰值应力对应的应变盐岩最大为0.0076,可达泥岩的1.5倍,钙芒硝岩的2倍以上;3种岩石中盐岩的声发射事件数最多为10148次,泥岩为119次,钙芒硝岩为1166次。盐岩首先在垫条处出现声发射事件点,泥岩与钙芒硝岩则在试样中间部分出现并沿加载方向朝两端延伸;3种岩石的能量率和振铃计数率在屈服变形阶段大幅上升,盐岩累计能量和累积振铃计数呈平滑曲线形式上升,泥岩的曲线呈阶梯状,钙芒硝岩在峰值应力附近陡增。平均能值和振铃计数盐岩最大为2.02×10^(-14) J和1200.6次,泥岩与钙芒硝岩相近,并且与盐岩的差值较大。
Salt rock,mudstone,and glauberite are three typical rocks of the salt cavern gas storage.In order to obtain the rocks’characteristic parameters of acoustic emission under the stretching test,the Brazilian split test and acoustic emission test were carried out.The results show that among the three rocks,salt rock’s strength is the lowest,with peak stress of 1.27 MPa,which is less than 1/2 of mudstone and slightly lower than glauberite.The maximum strain salt rock corresponding to the peak stress is 0.0076,which is 1.5 times larger than mudstone and more than 2 times that of glauberite.Among the three rocks,the maximum number of acoustic emission events for salt rock is 10148,mudstone is 119,and glauberite is 1166.The salt rock first appears the acoustic emission event point at the cushion,while the mudstone and glauberite appears in the middle part of the sample and extended towards both ends along the loading direction.The energy rate and the ringing count rate of three rocks increases significantly during the yield deformation stage.The cumulative energy and cumulative ringing count of the salt rock rose in the form of a smooth curve,which the curve of the mudstone is stepped,and the glauberite is steep near the peak stress.The maximum average energy and ringing count of salt rock is 2.02×10^(-14) J and 1200.6 times.Mudstone is similar to glauberite,of which difference between salt rock is large.
作者
林浩
刘建锋
徐邓
朱安奇
任奕
梁超
LIN Hao;LIU Jian-feng;XU Deng;ZHU An-qi;REN Yi;LIANG Chao(State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, China;College of Hydraulic and Hydroelectric Engineering, Sichuan University, Chengdu 610065, China)
出处
《科学技术与工程》
北大核心
2022年第16期6635-6641,共7页
Science Technology and Engineering
基金
国家自然科学基金(51874202)。
关键词
盐穴储气库
巴西劈裂
拉伸破坏
声发射
salt cavern gas storage
Brazil split
tensile failure
acoustic emission
