盐岩变形参数确定方法
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摘要
为更加准确地确定盐岩变形参数,利用弹性力学理论推导出常规三轴压缩试验确定盐岩变形参数的计算公式。对某地下盐穴储气库区盐岩试样进行单轴、三轴压缩试验,对比分析两种试验方法获取的盐岩变形参数结果;并研究以单轴压缩试验为依据确定盐岩变形参数时,应力-应变曲线不同变形段的选择对变形参数的影响。结果表明:当采用初始弹性变形阶段的应力-应变增量求取盐岩变形参数时,利用三轴压缩试验方法所得到的结果更接近实际;以单轴压缩试验为依据确定的盐岩弹性模量及剪切模量与实际有较大误差,对应抗压强度5%～10%弹性变形段参数结果较10%～30%弹性变形段参数结果更为准确。研究成果可为合理确定盐岩变形参数提供参考依据。(图2,表3,参20)
In order to determine the deformation parameters of salt rock more accurately, the formula for calculating the rock salt deformation parameters determined by the conventional triaxial compression tests was deduced according to the elasticity theory. Uniaxial and triaxial compression tests were carried out on the rock salt specimen of one certain salt cavern underground gas storage. The deformation parameters obtained by two different test methods were comparatively analyzed. Furthermore, the influence of the selection of different deformation segments in the stress-strain curve on the deformation parameters was studied when determining the deformation parameters of salt rock on the basis of the uniaxial compression test. It is shown that when the stress-strain increment of initial elastic deformation stage is used to calculate the rock salt deformation parameters, the result obtained through triaxial compression test is much closer to actual value.There is a greater deviation between the elastic modulus and shear modulus of salt rock determined on the basis of uniaxial compression test and the actual values, and elastic deformation parameters corresponding to 5%-10% compressive strength are more accurate than those to 10%-30% compressive strength. The research results provide a reference for the reasonable determination of rock salt deformation parameters.(2 Figures, 3 Tables, 20 References)
In order to determine the deformation parameters of salt rock more accurately, the formula for calculating the rock salt deformation parameters determined by the conventional triaxial compression tests was deduced according to the elasticity theory. Uniaxial and triaxial compression tests were carried out on the rock salt specimen of one certain salt cavern underground gas storage. The deformation parameters obtained by two different test methods were comparatively analyzed. Furthermore, the influence of the selection of different deformation segments in the stress-strain curve on the deformation parameters was studied when determining the deformation parameters of salt rock on the basis of the uniaxial compression test. It is shown that when the stress-strain increment of initial elastic deformation stage is used to calculate the rock salt deformation parameters, the result obtained through triaxial compression test is much closer to actual value.There is a greater deviation between the elastic modulus and shear modulus of salt rock determined on the basis of uniaxial compression test and the actual values, and elastic deformation parameters corresponding to 5%-10% compressive strength are more accurate than those to 10%-30% compressive strength. The research results provide a reference for the reasonable determination of rock salt deformation parameters.(2 Figures, 3 Tables, 20 References)
引文
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[14]刘建锋,边宇,郑得文,等.三轴应力状态下盐岩强度分析探讨[J].岩土力学,2014,35(4):919-925.LIU J F,BIAN Y,ZHENG D W,et al.Discussion on strength analysis of salt rock under triaxial compressive stress[J].Rock and Soil Mechanics,2014,35(4):919-925.
[15]胡静云,徐宏斌,唐海燕.非标准岩样岩石力学参数试验研究[J].采矿技术,2009,9(4):42-45.HU J Y,XU H B,TANG H Y.Experimental study on mechanical parameters of nonstandard rock specimen[J].Mining Technology,2009,9(4):42-45.
[16]秦向辉,谭成轩,孙进忠,等.地应力与岩石弹性模量关系试验研究[J].岩土力学,2012,33(6):1689-1695.QIN X H,TAN C X,SUN J Z,et al.Experimental study of relation between in-situ crustal stress and rock elastic modulus[J].Rock and Soil Mechanics,2012,33(6):1689-1695.
[17]尤明庆.岩石试样的杨氏模量与围压的关系[J].岩石力学与工程学报,2003,22(1):53-60.YOU M Q.Effect of confining pressure on the Young’s modulus of rock specimen[J].Chinese Journal of Rock Mechanics and Engineering,2003,22(1):53-60.
[18]韩嵩.深部地应力环境对砂岩力学性质的影响[J].矿业研究与开发,2007,27(2):16-31.HAN S.The influences of deep in-situ stress field on mechanical properties of sandstone[J].Mining Research and Development,2007,27(2):16-31.
[19]蔡美峰.岩石力学与工程[M].北京:科学出版社,2002:31-75.CAI M F.Rock mechanics and engineering[M].Beijing:Science Press,2002:31-75.
[20]杨桂通.弹塑性力学引论[M].北京:清华大学出版社,2004:79-98.YANG G T.Introduction to elasticity and plasticity[M].Beijing:Tsinghua University Press,2004:79-98.
[2]赵艳杰,马纪伟,郑雅丽,等.淮安盐穴储气库注采循环运行压力限值确定[J].油气储运,2013,32(5):526-531.ZHAO Y J,MA J W,ZHENG Y L,et al.Determination of operating pressure limit for injection-production cycle of saltcavern gas storage in Huai'an City[J].Oil&Gas Storage and Transportation,2013,32(5):526-531.
[3]YANG C H,JING W J,DAEMEN J J K,et al.Analysis of major risks associated with hydrocarbon storage caverns in bedded salt rock[J].Reliability Engineering and System Safety,2013,113:94-111.
[4]LI Y P,LIU W,YANG C H,et al.Experimental investigation of mechanical behavior of bedded rock salt containing inclined interlayer[J].International Journal of Rock Mechanics&Mining Sciences,2014,69:39-49.
[5]井文君,杨春和,陈锋.基于事故统计分析的盐岩地下油/气储库风险评价[J].岩土力学,2011,32(6):1787-1793.JING W J,YANG C H,CHEN F.Risk assessment of salt cavern oil/gas storage based on accident statistical analysis[J].Rock and Soil Mechanics,2011,32(6):1787-1793.
[6]王伟超,刘希亮,苏承东.盐岩巴西劈裂疲劳变形和强度特性研究[J].武汉大学学报(工学版),2018,51(4):305-313.WANG W C,LIU X L,SU C D.Study of deformation and strength characteristics of Brazilian splitting fatigue tests of salt rock[J].Engineering Journal of Wuhan University,2018,51(4):305-313.
[7]郝铁生,耿毅德,陈跃都.含脆硬夹层盐岩力学特性试验研究[J].岩土力学,2017,38(11):3119-3126.HAO T S,GENG Y D,CHEN Y D.Experimental investigation on mechanical behaviours of salt rock containing brittlehard interlayers[J].Rock and Soil Mechanics,2017,38(11):3119-3126.
[8]马旭强,施锡林,尹洪武,等.三轴压缩下含夹层盐岩破坏机制[J].岩土力学,2018,39(2):644-650.MA X Q,SHI X L,YIN H W,et al.Failure mechanisms of salt rock with an interlayer under triaxial compression[J].Rock and Soil Mechanics,2018,39(2):644-650.
[9]李梦瑶,苟杨,侯正猛.基于短期室内试验推导长期稳态蠕变率的盐岩本构模型[J].工程科学与技术,2018,50(5):138-144.LI M Y,GOU Y,HOU Z M.Rock salt creep constitutive model to predict the long-term stationary creep rate with short-term laboratory experimental data[J].Advanced Engineering Sciences,2018,50(5):138-144.
[10]刘江,杨春和,吴文,等.盐岩短期强度和变形特性试验研究[J].岩石力学与工程学报,2006,25(增刊1):3104-3109.LIU J,YANG C H,WU W,et al.Experiment study on shortterm strength and deformation properties of rock salts[J].Chinese Journal of Rock Mechanics and Engineering,2006,25(S1):3104-3109.
[11]曾寅,刘建锋,周志威,等.盐岩单轴蠕变声发射特征及损伤演化研究[J].岩土力学,2019,40(1):207-215.ZENG Y,LIU J F,ZHOU Z W,et al.Creep acoustic emission a n d d a m a g e e v o l u t i o n o f s a l t r o c k u n d e r u n i a x i a l compression[J].Rock and Soil Mechanics,2019,40(1):207-215.
[12]何满潮,薛廷河,彭延飞.工程岩体力学参数确定方法的研究[J].岩石力学与工程学报,2001,20(2):225-229.HE M C,XUE T H,PENG Y F.A new way of determining mechanical parameters of engineering rock masses[J].Chinese Journal of Rock Mechanics and Engineering,2001,20(2):225-229.
[13]ALKAN H,CINAR Y,PUSCH G.Rock salt dilatancy boundary from combined acoustic emission and triaxial compression tests[J].International Journal of Rock Mechanics and Mining Sciences,2007,44(1):108-114.
[14]刘建锋,边宇,郑得文,等.三轴应力状态下盐岩强度分析探讨[J].岩土力学,2014,35(4):919-925.LIU J F,BIAN Y,ZHENG D W,et al.Discussion on strength analysis of salt rock under triaxial compressive stress[J].Rock and Soil Mechanics,2014,35(4):919-925.
[15]胡静云,徐宏斌,唐海燕.非标准岩样岩石力学参数试验研究[J].采矿技术,2009,9(4):42-45.HU J Y,XU H B,TANG H Y.Experimental study on mechanical parameters of nonstandard rock specimen[J].Mining Technology,2009,9(4):42-45.
[16]秦向辉,谭成轩,孙进忠,等.地应力与岩石弹性模量关系试验研究[J].岩土力学,2012,33(6):1689-1695.QIN X H,TAN C X,SUN J Z,et al.Experimental study of relation between in-situ crustal stress and rock elastic modulus[J].Rock and Soil Mechanics,2012,33(6):1689-1695.
[17]尤明庆.岩石试样的杨氏模量与围压的关系[J].岩石力学与工程学报,2003,22(1):53-60.YOU M Q.Effect of confining pressure on the Young’s modulus of rock specimen[J].Chinese Journal of Rock Mechanics and Engineering,2003,22(1):53-60.
[18]韩嵩.深部地应力环境对砂岩力学性质的影响[J].矿业研究与开发,2007,27(2):16-31.HAN S.The influences of deep in-situ stress field on mechanical properties of sandstone[J].Mining Research and Development,2007,27(2):16-31.
[19]蔡美峰.岩石力学与工程[M].北京:科学出版社,2002:31-75.CAI M F.Rock mechanics and engineering[M].Beijing:Science Press,2002:31-75.
[20]杨桂通.弹塑性力学引论[M].北京:清华大学出版社,2004:79-98.YANG G T.Introduction to elasticity and plasticity[M].Beijing:Tsinghua University Press,2004:79-98.