砂板岩岩体力学特性的水岩耦合试验研究
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摘要
利用MTS815 Flex Test GT岩石力学试验系统,经过岩体受力状态模拟、无水压岩体力学特性测试、水岩耦合试验等几个阶段试验,对砂板岩岩体力学特性的高空隙水压效应进行了试验研究。结果表明:砂板岩岩体强度与变形性能随水压升高而降低,其中水压对黏聚力c的影响最大,对内摩擦角φ的影响甚微,对变形模量的影响居于二者之间。随着水压升高,岩体的黏聚力c急剧下降,当水压较高时,岩体可能完全丧失黏聚力;随着水压升高,变形模量E50和E0均有降低,两个参数的变化梯度相差不大。这些成果揭示了砂板岩岩体力学特性的高空隙水压力效应,并建立了主要力学参数预测模型,成果对于解决工程实际问题具有重要的参考价值。
Using rock mechanics test system with MTS815 Flex Test GT,the high pore water pressure effects of mechanical properties of the sandy slate rock mass are studied through several stages of tests,such as simulation of the stress state of rock mass,mechanical properties tests of rock mass without water pressure and coupling tests of water-rock.The results and analysis show that the strength and deformation properties of the sandy slate rock mass decrease with the increase of the water pressure.The water pressure has the greatest impact on cohesion c,the least impact on angle of internal friction φ,and a moderate impact on deformation modulus.The cohesion c reduces sharply with the rising water pressure.When the water pressure gets to a high level,rock mass completely loses cohesion.Both the deformation moduli E50 and E0 decrease with the rising water pressure,and their variation gradients have little diffience.These conclusions reveal the effect of pore water pressure on the mechanical properties of the sandy slate rock mass,and a prediction model for the main mechanical parameters is established.This study is valuable to solve practical engineering problems.
Using rock mechanics test system with MTS815 Flex Test GT,the high pore water pressure effects of mechanical properties of the sandy slate rock mass are studied through several stages of tests,such as simulation of the stress state of rock mass,mechanical properties tests of rock mass without water pressure and coupling tests of water-rock.The results and analysis show that the strength and deformation properties of the sandy slate rock mass decrease with the increase of the water pressure.The water pressure has the greatest impact on cohesion c,the least impact on angle of internal friction φ,and a moderate impact on deformation modulus.The cohesion c reduces sharply with the rising water pressure.When the water pressure gets to a high level,rock mass completely loses cohesion.Both the deformation moduli E50 and E0 decrease with the rising water pressure,and their variation gradients have little diffience.These conclusions reveal the effect of pore water pressure on the mechanical properties of the sandy slate rock mass,and a prediction model for the main mechanical parameters is established.This study is valuable to solve practical engineering problems.
引文
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[12]高春玉,徐进,李忠洪,等.雪峰山隧道砂板岩各向异性力学特性的试验研究[J].岩土力学,2011,32(5):1360–1364.(GAO Chun-yu,XU Jin,LI Zhong-hong,et al.Experimental study of anisotropically mechanicalcharacteristics of sandy slate in Xuefeng mountain tunnel[J].Rock and Soil Mechanics,2011,32(5):1360–1364.(inChinese))
[13]SL264—2001水利水电工程岩石试验规程[S].北京:水利水电出版社,2001.(SL264—2001Specifications for rocktests in water conservancy and hydroelectric engineering[S].Beijing:China Water&Power Press,2001.(in Chinese))
[14]GB/T50266—99工程岩体试验方法标准[S].北京:中国计划出版社,1999.(GB/T50266—99Standard for testsmethod of engineering rock massas[S].Beijing:ChinaPlanning Press,1999.(in Chinese))
[15]DL/T5368—2007水电水利工程岩石试验规程[S].北京:中国电力出版社,2007.(DL/T5368—2007Code for rocktests hydroelectric and water conservancy engineering[S].Beijing:China Electric Power Press,2007.(in Chinese))
[2]龚钢延.水渗透引起的应力场调整及岩石强度弱化的初步研究[J].西北地震学报,1990,12(4):55–59.(GONGGang-yan.Preliminary study on stress field adjustment androck strength weakening caused by water seeping[J].Northwestern Seismological Journal,1990,12(4):55–59.(in Chinese))
[3]陈钢林,周仁德.水对受力岩石变形破坏宏观力学效应的实验研究[J].地球物理学报,1991,34(3):335–342.(CHEN Gang-lin,ZHOU Ren-de.An experimental studyconcerning the macroscopic effect of water on thedeformation and failure of loaded rocks[J].Chinese Journalof Geophysics,1991,34(3):335–342.(in Chinese))
[4]吉随旺,张倬元,邓荣贵,等.川中红色砂泥岩岩石力学特性研究[J].地质灾害与环境保护,2000,11(1):72–74.(JISui-wang,ZHANG Zhuo-yuan,DENG Rong-gui,et al.Onthe rock mechanic propertics of mudstones and sandstones inthe middle part of Sichuan red basin[J].Journal of GeologicalHazards and Environment Preservation,2000,11(1):72–74.(in Chinese))
[5]刘长武,陆士良.泥岩遇水崩解软化机理的研究[J].岩土力学,2000,21(1):28–31.(LIU Chang-wu,LU Shi-liang.Research on mechanism of mudstone degradation andsoftening in water[J].Rock and Soil Mechanics,2000,21(1):28–31.(in Chinese))
[6]周翠英,邓毅梅,谭祥韶,等.软岩在饱水过程中微观结构变化规律研究[J].中山大学学报,2003,42(4):98–102.(ZHOU Cui-ying,DENG Yi-mei,TAN Xiang-shao,et al.Research onvariation regularities of micro-sturcures in thetesting of interaction between softrocks and water[J].ActaScientiarum Naturalium Universitatics Sunyatent,2003,42(4):98–102.(in Chinese))
[7]周翠英,邓毅梅,谭祥韶,等.饱水软岩力学性质软化的试验研究与应用[J].岩石力学与工程学报,2005,24(1):33–38.(ZHOU Cui-ying,DENG Yi-mei,TAN Xiang-shao,et al.Experimental research on the softening of mechanicalpropertites of saturated softrocks and application[J].ChineseJournal of Rock Mechanics and Engineering,2005,24(1):33–38.(in Chinese))
[8]周翠英,谭祥韶,邓毅梅,等.特殊软岩软化的微观机制研究[J].岩石力学与工程学报,2005,24(3):394–400.(ZHOU Cui-ying,TAN Xiang-shao,DENG Yi-mei,et al.Research on softening micromechanism of specialsoftrocks[J].Chinese Journal of Rock Mechanics andEngineering,2005,24(3):394–400.(in Chinese))
[9]张永安,李峰,陈军.红层泥岩水岩作用特征研究[J].工程地质学报,2008,16(1):22–26.(ZHANG Yong-an,LIFeng,CHEN Jun.Analysis of the interaction betweenmudstone and water[J].Journal of Engineering Geology,2008,16(1):22–26.(in Chinese))
[10]许强,黄润秋.岩体强度的各向异性研究[J].水文地质工程地质,1993,6:10–12.(XU Qiang,HUANG Run-qiu.Strength anisotropy study of rockmass[J].Hydrogeology andEngineering Geology,1993,6:10–12.(in Chinese))
[11]赵文瑞.泥质粉砂岩各向异性强度特征[J].岩土工程学报,1984,6(1):32–36.(ZHAO Wen-rui.Strength properties ofanisotropic rock of an argillaceous siltstone[J].ChineseJounal of Geotechnical Engineering,1984,6(1):32–36.(inChinese))
[12]高春玉,徐进,李忠洪,等.雪峰山隧道砂板岩各向异性力学特性的试验研究[J].岩土力学,2011,32(5):1360–1364.(GAO Chun-yu,XU Jin,LI Zhong-hong,et al.Experimental study of anisotropically mechanicalcharacteristics of sandy slate in Xuefeng mountain tunnel[J].Rock and Soil Mechanics,2011,32(5):1360–1364.(inChinese))
[13]SL264—2001水利水电工程岩石试验规程[S].北京:水利水电出版社,2001.(SL264—2001Specifications for rocktests in water conservancy and hydroelectric engineering[S].Beijing:China Water&Power Press,2001.(in Chinese))
[14]GB/T50266—99工程岩体试验方法标准[S].北京:中国计划出版社,1999.(GB/T50266—99Standard for testsmethod of engineering rock massas[S].Beijing:ChinaPlanning Press,1999.(in Chinese))
[15]DL/T5368—2007水电水利工程岩石试验规程[S].北京:中国电力出版社,2007.(DL/T5368—2007Code for rocktests hydroelectric and water conservancy engineering[S].Beijing:China Electric Power Press,2007.(in Chinese))
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