温、湿度对粉砂质泥岩单轴力学性能的影响试验
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摘要
为研究粉砂质泥岩经温、湿度作用后单轴力学性能的变化,开展变温循环试验、浸水试验以及浸水条件下的变温循环试验,得到粉砂质泥岩在不同温、湿度作用下的应力-应变曲线,并分析其单轴力学指标的变化规律。试验结果表明:粉砂质泥岩单轴抗压强度与超声波速呈正相关;天然粉砂质泥岩的峰前应力-应变曲线符合塑-弹-塑性岩石的特征;干燥粉砂质泥岩经历变温循环后,单轴抗压强度、弹性模量及劈裂强度均降低,且其降幅与循环次数、变温方向、温差变幅相关;恒温浸水时,粉砂质泥岩的轴向膨胀率和含水率在初期增长较快,后期逐渐趋于平缓,且单轴抗压强度、弹性模量及劈裂强度均随含水率的增大而降低;温、湿度共同作用于粉砂质泥岩时具有增效作用,作用效果大于温、湿度单独作用效果之和;粉砂质泥岩在单轴受压破坏后,根据其特征可分为六种破坏形态,且不同破坏形态的出现与含水率、拉压比相关。
In order to study the uniaxial mechanical properties of silty mudstone affected by temperature and humidity, the temperature cycle tests, the soaking tests and the temperature cycle tests under soaking condition were carried out. Based on the test results, the stress-strain curves of silty mudstone under different temperature and humidity conditions were obtained, and then the variation rules of uniaxial mechanical indexes were analyzed. The test results indicate that the compressive strength of mudstone is positively correlated with the ultrasonic velocity. The pre-peak stress-strain curve of natural silty mudstone meets the characteristics of plastic-elastic-plastic rock. After the temperature cycles, the uniaxial compressive strength, elastic modulus and splitting strength of dry silty mudstone decrease, and the decreasing range is associated with the cycles, direction of temperature shift and temperature difference. After soaking water at a constant temperature, the expansion rate and water content of silty mudstone increase rapidly at the early stage and tend to be gentle at the later stage, the uniaxial compressive strength, elastic modulus and splitting strength of silty mudstone decrease with the increase of water content. The synergistic effects of temperature and humidity on silty mudstone are greater than the sum of the effects of individual temperature and individual humidity. When the silty mudstone are destroyed under uniaxial compression, six kinds of failure modes can be observed according to the failure characteristics, and the occurrence of different failure modes are dependent on water content and tension-compression ratio.
In order to study the uniaxial mechanical properties of silty mudstone affected by temperature and humidity, the temperature cycle tests, the soaking tests and the temperature cycle tests under soaking condition were carried out. Based on the test results, the stress-strain curves of silty mudstone under different temperature and humidity conditions were obtained, and then the variation rules of uniaxial mechanical indexes were analyzed. The test results indicate that the compressive strength of mudstone is positively correlated with the ultrasonic velocity. The pre-peak stress-strain curve of natural silty mudstone meets the characteristics of plastic-elastic-plastic rock. After the temperature cycles, the uniaxial compressive strength, elastic modulus and splitting strength of dry silty mudstone decrease, and the decreasing range is associated with the cycles, direction of temperature shift and temperature difference. After soaking water at a constant temperature, the expansion rate and water content of silty mudstone increase rapidly at the early stage and tend to be gentle at the later stage, the uniaxial compressive strength, elastic modulus and splitting strength of silty mudstone decrease with the increase of water content. The synergistic effects of temperature and humidity on silty mudstone are greater than the sum of the effects of individual temperature and individual humidity. When the silty mudstone are destroyed under uniaxial compression, six kinds of failure modes can be observed according to the failure characteristics, and the occurrence of different failure modes are dependent on water content and tension-compression ratio.
引文
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[9]李良权,王伟.粉砂质泥岩流变力学参数的试验研究[J].三峡大学学报:自然科学版,2009,31(6):45-49(Li Liangquan,Wang Wei.Experimental study of rheological-mechanical properties of silty mudstone[J].Journal of China Three Gorges University:Natural Science Edition,2009,31(6):45-49(in Chinese))
[10]李克钢,郑东普,黄维辉.干湿循环作用下砂岩力学特性及其本构模型的神经网络模拟[J].岩土力学,2013,34(2):168-173(Li Kegang,Zheng Dongpu,Huang Weihui.Mechanical behavior of sandstone and its neural network simulation of constitutive model considering cyclic drying-wetting effect[J].Rock and Soil Mechanics,2013,34(2):168-173(in Chinese))
[11]杨永明,鞠杨,陈佳亮,等.温度作用对孔隙岩石介质力学性能的影响[J].岩土工程学报,2013,35(5):856-864(Yang Yongming,Ju Yang,Chen Jialiang,et al.Mechanical propertie of porus rock media subjected to temperature effect[J].Chinese Journal of Geotechnical Engineering,2013,35(5):856-864(in Chinese))
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[13]Kovari H H,Franklin A J.Suggested methods for determining the strength of rock material in triaxial compression[J].International Journal of Rock Mechanics and Mining Science and Geomechanics Abstracts,1984,20(6):285-290
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[15]赵明阶,徐蓉.岩石损伤特性与强度的超声波速研究[J].岩土工程学报,2000,22(6):720-722(Zhao Mingjie,Xu Rong.The rock damage and strength study based on ultrasonic velocity[J].Chinese Journal of Geotechnical Engineering,2000,22(6):720-722(in Chinese))
[16]赵明阶,吴德伦.工程岩体的超声波分类及强度预测[J].岩石力学与工程学报,2000,19(1):89-92(Zhao Mingjie,Wu Delun.The ultrasonic identification of rock mass classification and rock mass strength prediction[J].Chinese Journal of Rock Mechanics and Engieering,2000,19(1):89-92(in Chinese))
[17]米勒.岩石力学[M].李世平,译.北京:煤炭工业出版社,1981(Muller L.Rock mechanics[M].Li Shiping,trans.Beijing:Springer-Verlag,1981(in Chinese))
[18]陈旭光,张强勇.岩石剪切破坏过程的能量耗散和释放研究[J].采矿与安全工程,2010,27(2):179-183(Chen Xuguang,Zhang Qiangyong.Research on the energy dissipation and release in the process of rock shear failure[J].Journal of Mining&Safety Engineering,2010,27(2):179-183(in Chinese))
[2]黄宏伟,车平.泥岩遇水软化微观机理研究[J].同济大学学报:自然科学版,2007,35(7):867-870(Huang Hongwei,Che Ping.Research on micro mechanism of softening and argillitization of mudstone[J].Journal of Tongji University:Natural Science Edition,2007,35(7):867-870(in Chinese))
[3]杨建林,王来贵,李喜林,等.粉砂质泥岩遇水损伤规律及化学改性研究[J].硅酸盐通报,2016,35(6):1883-1890(Yang Jianlin,Wang Laigui,Li Xilin,et al.Damage-law of silty-mudstone in water and chemical modification[J].Bulletin of the Chinese Ceramic Society,2016,35(6):1883-1890(in Chinese))
[4]刘镇,周翠英,朱凤贤.软岩饱水演化过程微观结构演化的临界判据[J].岩土力学,2011,32(3):661-666(Liu Zhen,Zhou Cuiying,Zhu Fengxian.Critical criterion for microstructure evolution of soft rocks in softening process[J].Rock and Soil Mechanics,2011,32(3):661-666(in Chinese))
[5]杨振峰,缪林昌.粉砂质泥岩的强度衰减与环境效益试验研究[J].岩石力学与工程学报,2007,26(12):2576-2582(Yang Zhenfeng,Miu Linchang.Experimental study on silty mudstone strength attenuation and environmental effect[J].Chinese Journal of Rock Mechanics an Engineering,2007,26(12):2576-2582(in Chinese))
[6]周怡,彭振斌,陈安.潭衡西高速公路第三系粉砂质泥岩崩解特性研究[J].湖南科技大学学报:自然科学版,2009,24(4):52-55(Zhou Yi,Peng Zhenbin,Chen An.The disintegration characteristics of tertiary silty mudstone along Xiangtan to Hengyang expressway[J].Journal of Hunan University of Science&Technology:Nature Science Edition,2009,24(4):52-55(in Chinese))
[7]于怀昌,李亚丽,刘汉东.粉砂质泥岩常规力学?蠕变以及应力松弛特性的对比研究[J].岩石力学与工程学报,2012,31(1):60-70(Yu Huaichang,Li Yali,Liu Handong.Comparative study of conventional mechanical,creep and stress relaxation properties of silty mudstone under triaxial compression[J].Chinese Journal of Rock Mechanics and Engieering,2012,31(1):60-70(in Chinese))
[8]陈小婷,彭轩明,黄润秋.粉砂质泥岩剪切流变特性试验分析[J].三峡大学学报:自然科学版,2008,30(4):43-46(Chen Xiaoting,Peng Xuanming,Huang Runqiu.Experimental study of shear rheological property of silty mudstone[J].Journal of China Three Gorges University:Natural Science Edition,2008,30(4):43-46(in Chinese))
[9]李良权,王伟.粉砂质泥岩流变力学参数的试验研究[J].三峡大学学报:自然科学版,2009,31(6):45-49(Li Liangquan,Wang Wei.Experimental study of rheological-mechanical properties of silty mudstone[J].Journal of China Three Gorges University:Natural Science Edition,2009,31(6):45-49(in Chinese))
[10]李克钢,郑东普,黄维辉.干湿循环作用下砂岩力学特性及其本构模型的神经网络模拟[J].岩土力学,2013,34(2):168-173(Li Kegang,Zheng Dongpu,Huang Weihui.Mechanical behavior of sandstone and its neural network simulation of constitutive model considering cyclic drying-wetting effect[J].Rock and Soil Mechanics,2013,34(2):168-173(in Chinese))
[11]杨永明,鞠杨,陈佳亮,等.温度作用对孔隙岩石介质力学性能的影响[J].岩土工程学报,2013,35(5):856-864(Yang Yongming,Ju Yang,Chen Jialiang,et al.Mechanical propertie of porus rock media subjected to temperature effect[J].Chinese Journal of Geotechnical Engineering,2013,35(5):856-864(in Chinese))
[12]Heuze F E.High-temperature mechanical,physical and thermal properties of granitic rocks-a review[J].International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts,1983,20(1):3-10
[13]Kovari H H,Franklin A J.Suggested methods for determining the strength of rock material in triaxial compression[J].International Journal of Rock Mechanics and Mining Science and Geomechanics Abstracts,1984,20(6):285-290
[14]JTG E41-2005公路工程岩石试验规程[S].北京:人民交通出版社,2005(JTG E41-2005 Test methods of rock for highway engineering[S].Beijing:China Communication Press,2005(in Chinese))
[15]赵明阶,徐蓉.岩石损伤特性与强度的超声波速研究[J].岩土工程学报,2000,22(6):720-722(Zhao Mingjie,Xu Rong.The rock damage and strength study based on ultrasonic velocity[J].Chinese Journal of Geotechnical Engineering,2000,22(6):720-722(in Chinese))
[16]赵明阶,吴德伦.工程岩体的超声波分类及强度预测[J].岩石力学与工程学报,2000,19(1):89-92(Zhao Mingjie,Wu Delun.The ultrasonic identification of rock mass classification and rock mass strength prediction[J].Chinese Journal of Rock Mechanics and Engieering,2000,19(1):89-92(in Chinese))
[17]米勒.岩石力学[M].李世平,译.北京:煤炭工业出版社,1981(Muller L.Rock mechanics[M].Li Shiping,trans.Beijing:Springer-Verlag,1981(in Chinese))
[18]陈旭光,张强勇.岩石剪切破坏过程的能量耗散和释放研究[J].采矿与安全工程,2010,27(2):179-183(Chen Xuguang,Zhang Qiangyong.Research on the energy dissipation and release in the process of rock shear failure[J].Journal of Mining&Safety Engineering,2010,27(2):179-183(in Chinese))