| 膏岩三轴压缩试验及高温相变特征研究 |
| |
| 引用本文： | 俞凌杰,张文涛,范明,刘伟新,彭瑞东.膏岩三轴压缩试验及高温相变特征研究[J].岩土力学,2012,33(11):3318-3322. |
| |
| 作者姓名： | 俞凌杰 张文涛 范明 刘伟新 彭瑞东 |
| |
| 作者单位： | 1. 中国石油化工股份有限公司 石油勘探开发研究院 无锡石油地质研究所，江苏 无锡 214151； 2. 中国石油化工集团公司油气成藏重点实验室，江苏 无锡 214126；3. 中国矿业大学 煤炭资源与安全开采国家重点实验室，北京 100083 |
| |
| 基金项目： | 国家科技重大专项项目，国家自然科学基金项目 |
| |
| 摘 要： | 采用伺服刚性试验机对天然膏岩开展三轴压缩试验，研究了温度及围压对膏岩强度及变形特性的影响。结果表明，膏岩在不同围压下均具有良好的塑性流动特性，加载后无明显的剪切破坏面，而是出现明显的侧向膨胀。根据三轴试验结果，利用摩尔-库仑定律得到了膏岩的强度准则及抗剪强度参数。升高温度导致膏岩强度降低，且高温下石膏发生晶型转变，从二水石膏脱水转变为半水石膏，利用扫描电镜和X衍射对此过程进行了研究。脱水过程导致瞬间孔隙应力增加，膏岩破坏特性由延性转变为脆性。随着持续加载，破裂断面逐渐愈合。膏岩显著的塑性流动能力及快速的裂隙愈合能力对于天然气盖层的封闭稳定性具有重要意义。
|
| 关 键 词： | 膏岩 三轴压缩 高温相变 应力-应变曲线 |
| 收稿时间： | 2011-09-13 |
Study of gypsum rock triaxial compression experiment and characteristic of high temperature phase transition |
| |
| YU Ling-jie
,
ZHANG Wen-tao
,
FAN Ming
,
LIU Wei-xin
,
PENG Rui-dong.Study of gypsum rock triaxial compression experiment and characteristic of high temperature phase transition[J].Rock and Soil Mechanics,2012,33(11):3318-3322. |
| |
| Authors: | YU Ling-jie ZHANG Wen-tao FAN Ming LIU Wei-xin PENG Rui-dong |
| |
| Institution: | 1. Wuxi Research Institute of Petroleum Geology, Exploration & Production Research Institute, SinoPec, Wuxi, Jiangsu 214151, China; 2. SinoPec Key Laboratory of Petroleum Accumulation Mechanisms, Wuxi, Jiangsu 214126, China; 3. State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Beijing 100083, China |
| |
| Abstract: | Experiments are carried out to study the influences of temperature and confining pressure on natural gypsum rock strength and deformation properties under triaxial compression using servo-controlling testing machine. The results indicate that gypsum rock has obvious plastic flow property under different confining pressures. There is no obvious shear failure surface but lateral dilation is observed. Based on Coulomb-Mohr theory, the strength criterion and shear strength parameters of gypsum rock are obtained. With the increase of temperature, the strength of gypsum decreases. At high temperature, gypsum dehydration process takes place with result of transformation from gypsum to bassanite. Scanning electron microscope (SEM) and X-ray diffraction (XRD) methods are used to study the process. With the dehydration process, the pore pressure increases and the failure property becomes brittle. With load continuing, failure surface tends to heal. Obvious plastic flow characteristic and fast self-healing property of gypsum rock are fundamental to sealing stability of natural gas caprock. |
| |
| Keywords: | gypsum rock triaxial compression high temperature phase transition stress-strain curve |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
| 点击此处可从《岩土力学》浏览原始摘要信息 |
| 点击此处可从《岩土力学》下载免费的PDF全文 |
|
