›› 2012, Vol. 33 ›› Issue (11): 3318-3322.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Study of gypsum rock triaxial compression experiment and characteristic of high temperature phase transition

YU Ling-jie1, 2，ZHANG Wen-tao1, 2，FAN Ming1, 2，LIU Wei-xin1, 2，PENG Rui-dong3   

  1. 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
  • Received:2011-09-13 Online:2012-11-12 Published:2012-11-14

PDF (Chinese)

1933

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.

Key words: gypsum rock, triaxial compression, high temperature phase transition, stress-strain curve

CLC Number: 

  • TU 452
[1] GAO Feng, CAO Shan-peng, XIONG Xin, ZHOU Ke-ping, ZHU Long-yin, . Brittleness evolution characteristics of cyan sandstone under freeze-thaw cycles [J]. Rock and Soil Mechanics, 2020, 41(2): 445-452.
[2] ZHOU Cui-ying, LIANG Ning, LIU Zhen, . Fractal characteristics of compression failure of red soft rock and cascading failure process [J]. Rock and Soil Mechanics, 2019, 40(S1): 21-31.
[3] WANG Juan-juan, HAO Yan-zhou, WANG Tie-hang. Experimental study of structural characteristics of unsaturated compacted loess [J]. Rock and Soil Mechanics, 2019, 40(4): 1351-1357.
[4] LI Xiao-zhao, QI Cheng-zhi, SHAO Zhu-shan, QU Xiao-lei, . Micromechanics-based model study of shear properties of brittle rocks [J]. Rock and Soil Mechanics, 2019, 40(4): 1358-1367.
[5] SONG Hong-qiang, ZUO Jian-ping, CHEN Yan, LI Li-yun, HONG Zi-jie, . Revised energy drop coefficient based on energy characteristics in whole process of rock failure [J]. Rock and Soil Mechanics, 2019, 40(1): 91-98.
[6] PENG Shou-jian, WANG Zhe, XU Jiang, OKUBO Seisuke, TANG Yang, . Experimental study on loading rate effect in post-failure region of water-saturated rock under triaxial compression [J]. Rock and Soil Mechanics, 2018, 39(S2): 72-82.
[7] CUI De-shan, CHEN Qiong, XIANG Wei, WANG Jing-e, . Experimental study of stress relaxation characteristics of saturated sliding zone soils of Huangtupo landslide under triaxial compression [J]. Rock and Soil Mechanics, 2018, 39(S2): 209-216.
[8] FANG Xiang-wei, LI Jing-xin, LI Jie, SHEN Chun-ni,. Study of triaxial compression test and damage constitutive model of biocemented coral sand columns [J]. , 2018, 39(S1): 1-8.
[9] HUANG Zheng-hong, DENG Shou-chun, LI Hai-bo, YU Chong,. Tensile tests on plate specimens with bilateral asymmetric cracks [J]. , 2018, 39(S1): 267-274.
[10] ZHOU Yi-chao, CHEN Cong-xin, LIU Xiu-min, DUAN Shu-qian, ZHANG Hai-na, XIA Kai-zong,. Experiments on ageing effect of gypsum rock induced by water [J]. , 2018, 39(6): 2124-2130.
[11] CHEN Wei-chang, WANG Si-jing, LI Li, ZHANG Xiao-ping, WANG Yan-bing, . Test on mechanical characteristics of modified ginger nut [J]. , 2018, 39(5): 1796-1804.
[12] REN Song, LI Zhen-yuan, DENG Gao-ling, LIU Wei, PU Wen-ming，. Softening characteristic of gypsum rock under the action of multi-factors [J]. , 2018, 39(3): 789-796.
[13] MA Xu-qiang, SHI Xi-lin, YIN Hong-wu, YANG Chun-he, LI Yin-ping, MA Hong-ling，. Failure mechanisms of salt rock with an interlayer under triaxial compression [J]. , 2018, 39(2): 644-650.
[14] ZHANG Jin-xun, YANG Hao, SHAN Ren-liang, SUI Shun-meng, XUE Dong-chao，. Experimental research on triaxial compressive strength of frozen saturated sandy gravel [J]. , 2018, 39(11): 3993-4000.
[15] DU Hai-min, MA Wei, ZHANG Shu-juan, ZHOU Zhi-wei. Effects of confining pressure and water content on failure strain energy density for frozen silty sands [J]. , 2017, 38(7): 1943-1950.
Viewed
Full text


Abstract

Cited
  Shared   
  Discussed   
[1] CUI Hao-dong, ZHU Yue-ming. Back analysis of seepage field of Ertan high arch dam foundation[J]. , 2009, 30(10): 3194 -3199 .
[2] YANG Zi-you, GU Jin-cai, YANG Ben-shui, CHEN An-min, XU Jing-mao. Numerical analysis of reinforcement effects and response to dynamic loads characteristics of rock bolts[J]. , 2009, 30(9): 2805 -2809 .
[3] ZHAO Hong-bao, YIN Guang-zhi, LI Xiao-shuang. Experimental study of characteristics of tensile burned gritstone[J]. , 2010, 31(4): 1143 -1146 .
[4] LIU Qing-bing，XIANG Wei，ZHANG Wei-feng，CUI De-shan. Experimental study of ionic soil stabilizer-improves expansive soil[J]. , 2009, 30(8): 2286 -2290 .
[5] CHEN Zhi-qiang, ZHANG Yong-xing, ZHOU Jian-ying. Experimental study of deep tunnel surrounding rock rockburst proneness with similarity material simulating method based on digital speckle correlation technique[J]. , 2011, 32(S1): 141 -148 .
[6] DU Wen-qi, WANG Gang. Statistical analysis of earthquake-induced sliding displacements of earth structures[J]. , 2011, 32(S1): 520 -0525 .
[7] WEI Hou-zhen, YAN Rong-tao, CHEN Pan, TIAN Hui-hui, WU Er-lin, WEI Chang-fu. Deformation and failure behavior of carbon dioxide hydrate-bearing sands with different hydrate contents under triaxial shear tests[J]. , 2011, 32(S2): 198 -203 .
[8] GONG Si-yuan，DOU Lin-ming，HE Jiang，HE Hu，LU Cai-ping，MU Zong-long. Study of correlation between stress and longitudinal wave velocity for deep burst tendency coal and rock samples in uniaxial cyclic loading and unloading experiment[J]. , 2012, 33(1): 41 -47 .
[9] ZHANG Le-wen , ZHANG De-yong , QIU Dao-hong. Application of radial basis function neural network to geostress field back analysis[J]. , 2012, 33(3): 799 -804 .
[10] LI Shun-qun ，GAO Ling-xia ，CHAI Shou-xi. Significance and interaction of factors on mechanical properties of frozen soil[J]. , 2012, 33(4): 1173 -1177 .
Copyright © Rock and Soil Mechanics, All Rights Reserved.
Tel: 027-87198484, 87199252, 87199253, 87198752　E-mail: ytlx@whrsm.ac.cn
Powered by Beijing Magtech Co. Ltd