Research on the heat-force-liquid coupling of rock is extremely important for deep mining engineering, nuclear waste storage, geothermal resources exploitation and utilization and other engineering fields. In an attempt to study the permeability evolution regularity of rock after high temperature, the mechanical properties of rock mass undergone thermal fracture treatment at different temperatures were analyzed in terms of strength and permeability through triaxial loading test. Rock samples collected from a mining well in Tarim were taken as research objects. Results manifested that:(1)In the initial stage of loading, the climbing of confining pressure led to lower permeability;in the mid-stage, permeability increased slowly; in the later stage of loading, permeability increased dramatically. (2) The permeability of rock increased in positive exponential relation with the rising of temperature. (3) The thermal expansion of rock was unapparent below a certain temperature, while thermal expansion induced by higher temperature would significantly damage rock structure, mitigating the increasing of elastic modulus and strength with the rise of temperature. (4) In line with the theory of thermodynamics, the rock fracture caused by thermal stress under varying temperature was deduced, and the model of permeability varying with temperature was obtained. The results offer reference for the study of multi-field coupling under high temperature.
Key words
rock mechanics /
mechanical properties /
triaxial test /
thermal stress /
permeability /
fitting model
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
References
[1] PATSOULS G,GRIPPS J C.An Investigation of Permeability of Yorkshire Chalk under Differing Pore Water and Confining Pressure Conditions[J]. Energy Sources, 1982, 6(4): 321-334.
[2] ENEVER J R E, HENNING A. The Relationship between Permeability and Effective Stress for Australian Coal and its Implications with Respect to Coalbed Methane Exploration and Reservoir Model[C]∥Proceedings of the 1997 International Coalbed Methane Symposium. Tuscaloosa,Alabama,USA:The University of Alabama,1997:13-22.
[3] ZHARIKOV A V, SHMONOV V M, VITOVTOVA V M.Experimental Study of Rock Permeability and its Anisotropy at High Temperature and Pressure[R]. Moscow, Russia: Institute of Geology of Ore Deposits, 2001.
[4] 彭苏萍,孟召平,王虎,等. 不同围压下砂岩孔渗规律试验研究[J]. 岩石力学与工程学报, 2003, 22(5): 742-746.
[5] 李世平,李玉寿,吴振业.岩石全应力应变过程对应的渗透率-应变方程[J].岩土工程学报, 1995, 17(2): 13-19.
[6] 彭苏萍,屈洪亮,罗立平,等.沉积岩石全应力-应变过程的渗透性试验研究[J].煤炭学报, 2000, 25(2):113-116.
[7] 薛东杰,周宏伟,唐咸力,等. 采动煤岩体瓦斯渗透率布规律与演化过程[J].煤炭学报, 2013, 38(6): 930-935.
[8] 郑纲. 岩体裂隙三轴应力渗透规律的试验研究[J]. 工程地质学报,2004,12(1):30-33.
[9] 徐礼华,谢妮. 岩石剪切裂隙渗流特性试验与理论研究[J]. 岩石力学与工程学报,2009,28(11):2249-2257.
[10] 常宗旭,赵阳升,胡耀青,等. 三维应力作用下单一裂缝渗流规律的理论与试验研究[J]. 岩石力学与工程学报,2004,23(4):620-624.
[11] 黄先伍,唐平,缪协兴,等. 破碎砂岩渗透特性与孔隙率关系的试验研究[J]. 岩土力学,2005,26(9):1385-1388.
[12] 刘卫群,缪协兴,陈占清. 破碎岩石渗透性的试验测定方法[J].实验力学,2003,18(1):57-61.
[13] MIAO Xie-xing, LI Shun-cai, CHEN Zhan-qing, et al. Experimental Study of Seepage Properties of Broken Sandstone under Different Porosities[J]. Transport in Porous Media, 2011, 86(3):805-814.
[14] 梁冰,高红梅,兰永伟. 岩石渗透率与温度关系的理论分析和试验研究[J]. 岩石力学与工程学报, 2005, 24(12): 2009-2012.
PDF(4455 KB)
