砂岩与花岗岩在冻融循环和化学腐蚀下力学性能及断裂韧度变化的对比
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摘要
为探究冻融循环-多种化学溶液溶蚀等因素耦合作用下岩石力学特性的变化规律,选取砂岩和花岗岩作为岩样开展了一系列岩石力学试验,借助智能显微镜观察比较了不同外部条件影响下岩石的表面微观结构,分析了岩石的溶液溶蚀机理和冻融损伤机理。试验结果表明岩石应力-应变关系、弹性模量、峰值应力、断裂韧度等力学特性受溶液溶质种类的影响较小,而受冻融循环温度影响显著,砂岩受冻融循环破坏程度大于花岗岩。两种岩石力学特性都随冻融循环温度的降低而减弱,I型断裂韧度与冻融循环温度之间呈二次函数关系。
A series of rock mechanics tests were carried out on sandstone and granite samples,to study the variation law of rock mechanical characteristics under the coupling effect of freeze-thaw cycling and multiple chemical solutions corrosion. The surface microstructures of rock under different external conditions were observed and compared via intelligent microscopy. The chemical corrosion and freeze-thaw damage mechanism were analyzed. The test results show that the mechanical properties of rock,such as stress-strain relationship,elastic modulus,peak stress and fracture toughness,are less affected by the type of chemical solutions,and are significantly affected by freeze-thaw cycling temperature. The damage degree of sandstone under freeze-thaw cycling is greater than that of granite. The mechanical properties of both rocks decrease with the decrease of freeze-thaw cycling temperature. The relationship between fracture toughness type I and freeze-thaw cycling temperature is quadratic function.
A series of rock mechanics tests were carried out on sandstone and granite samples,to study the variation law of rock mechanical characteristics under the coupling effect of freeze-thaw cycling and multiple chemical solutions corrosion. The surface microstructures of rock under different external conditions were observed and compared via intelligent microscopy. The chemical corrosion and freeze-thaw damage mechanism were analyzed. The test results show that the mechanical properties of rock,such as stress-strain relationship,elastic modulus,peak stress and fracture toughness,are less affected by the type of chemical solutions,and are significantly affected by freeze-thaw cycling temperature. The damage degree of sandstone under freeze-thaw cycling is greater than that of granite. The mechanical properties of both rocks decrease with the decrease of freeze-thaw cycling temperature. The relationship between fracture toughness type I and freeze-thaw cycling temperature is quadratic function.
引文
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[4] MUNEO H,HIDENORI M. Micromechanical analysis on deterioration due to freezing and thawing in porous brittle materials[J]. International Journal of Engineering Science,1998,36(4):511-522.
[5]徐光苗,刘泉声.岩石冻融破坏机理分析及冻融力学试验研究[J].岩石力学与工程学报,2005,24(17):3076-3082.
[6]YAMABE T,NEAUPANE K M. Determination of some thermo-mechanical properties of Sirahama sandstone under subzero temperature condition[J]. International Journal of Rock Mechanics&Mining Sciences,2001,38(7):1029-1034.
[7]李新平,路亚妮,王仰君等.冻融荷载耦合作用下单裂隙岩体损伤模型研究[J].岩石力学与工程学报,2013,32(11):2307-2315.
[8]陈四利,冯夏庭,李邵军.化学腐蚀对黄河小浪底砂岩力学特性的影响[J].岩土力学,2002,23(3):284-287.
[9]乔丽苹,刘建,冯夏庭.砂岩水物理化学损伤机制研究[J].岩石力学与工程学报,2007,26(10):2117-2124.
[10] LI N,ZHU Y,SU B,et al. A chemical damage model of sandstone in acid solution[J]. International Journal of Rock Mechanics&Mining Sciences,2003,40(2):243-249.
[11]陈有亮,王朋,张学伟,等.花岗岩在化学溶蚀和冻融循环后的力学性能试验研究[J].岩土工程学报,2014,36(12):2226-2235.
[12]张牡丹,王苏然,曾健霜,等.花岗岩超低温冻融循环后力学特性研究[J].上海理工大学学报,2017,39(5):484-489.
[13]盛金昌,李凤滨,姚德生,等.渗流-应力-化学耦合作用下岩石裂隙渗透特性试验研究[J].岩石力学与工程学报,2012,31(5):1016-1025.
[14]陈卫忠,谭贤君,于洪丹,等.低温及冻融环境下岩体热、水、力特性研究进展与思考[J].岩石力学与工程学报,2011,30(7):1318-1336.
[15]申艳军,杨更社,荣腾龙,等.岩石冻融循环试验建议性方案探讨[J].岩土工程学报,2016,38(10):1775-1782.
[16]王朋.化学-温度-应力耦合作用对岩石力学性能的影响[D].上海:上海理工大学,2014.
[17]曹沁智,邓敏,黄蓓,等.白云质岩石中酸不溶物对碱白云石反应的影响[J].南京工业大学学报(自然科学版),2018,40(1):89-94.