软岩饱水软化过程微观结构演化的临界判据
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摘要
针对红层软岩遇水软化问题,在已开展的粉砂质泥岩饱水软化试验结果的基础上,从建立软岩微观结构模型出发,定量化研究软岩软化的力学机制。首先将描述粉砂质颗粒特性的结构元件引入到M.Tuller、D.Or提出的黏土矿物微结构模型中,提出了软岩微观结构组合元件;然后结合软岩饱水软化试验中微观结构测试结果,考虑天然状态软岩微观结构的基本类型特征,建立了描述粒状结构与致密条块状结构软岩的两类典型微观结构单元;在此基础上,采用重整化群方法,分别建立了两类软岩软化的重整化模型,并基于重整化原理,分析了软岩软化过程微观结构演化的临界判据,搭建了软岩微观结构与其力学特性之间的定量关系。通过对比软岩饱水软化过程力学性质试验结果,验证了所建立模型的合理性,为进一步开展软岩软化全过程定量化研究奠定基础。
Aiming at the softening problem of red-layer soft rock,the quantified study of softening mechanism has been carried out from the point of microstructure evolution,based on data from the saturated softening test of sandy mudstone.Firstly,a structure component describing the granular characteristic is proposed to combine with the microstructure model of clay mineral proposed by M.Tuller,D.Or,and the combination components of microstructure for soft rocks are obtained.Then considering the basic types and features of soft rock microstructure,two typical microstructure units to represent the granular structure and dense stripy structure are established.On this basis,renormalization group method is adopted to build the renormalization model and analyze the critical criterion for microstructure evolution of soft rocks in softening process.So the quantified relationship between microstructure and mechanical properties is obtained.Finally,according to comparing the results of the mechanical properties test of saturated soft rocks,the rationality of proposed models is verified.
Aiming at the softening problem of red-layer soft rock,the quantified study of softening mechanism has been carried out from the point of microstructure evolution,based on data from the saturated softening test of sandy mudstone.Firstly,a structure component describing the granular characteristic is proposed to combine with the microstructure model of clay mineral proposed by M.Tuller,D.Or,and the combination components of microstructure for soft rocks are obtained.Then considering the basic types and features of soft rock microstructure,two typical microstructure units to represent the granular structure and dense stripy structure are established.On this basis,renormalization group method is adopted to build the renormalization model and analyze the critical criterion for microstructure evolution of soft rocks in softening process.So the quantified relationship between microstructure and mechanical properties is obtained.Finally,according to comparing the results of the mechanical properties test of saturated soft rocks,the rationality of proposed models is verified.
引文
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[10]周翠英,邓毅梅,谭详韶,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 mechanical properties of saturated soft rocks and application[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(1):33-38.
[11]MARKUS TULLER,DANI OR.Hydraulic functions for swelling soils:pore scale considerations[J].Journal of Hydrology,2003,272(1-4):50-71.
[12]陈颙,郑洁.分形与混沌——在地质学和地球物理学中的应用[M].北京:地震出版社,1993.
[13]BUSHEV M.Synergetics,chaos,order,self-organ-ization[M].Shagapore:World Scientific,1994:1-275.
[2]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.Research on softenging micro-mechanism of special soft rocks[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(3):394-400.
[3]朱建明,任天贵,高谦,等.小官庄铁矿软岩微观特性的实验室研究[J].中国矿业,1997,6(4):56.ZHU Jian-ming,REN Tian-gui,GAO Qian,et al.Tests and research of the micro-characteristics of soft rocks of xiaoguanzhuang iron mine[J].China Mining Magazine,1997,6(4):56.
[4]KOMINE H.Simplified evaluation for swelling characteristics of bentonites[J].Engineering Geology,2004,71(3/4):265-279.
[5]杨春和,冒海军,王学湖,等.板岩遇水软化的微观结构及力学特性研究[J].岩土力学,2006,27(12):2090-2098.YANG Chun-he,MAO Hai-jun,WANG Xue-hu,et al.Study on variation of microstructure and mechanical properties of water-weakening slate[J].Rock and Soil Mechanics,2006,27(12):2090-2098.
[6]MARCEL ARNOULD.Discontinuity networks in mudstones:A geological approach[J].Bulletin of Engineering Geology and the Environment,2006,65(4):413-422.
[7]RISNES R,HAGHIGHI H,KORSNES R I,et al.Chalk-fluid interactions with glycol and brines[J].Tectonophysics,2003,370(1-4):213-226.
[8]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(自然科学版),2004,42(4):98-102.ZHOU Cui-ying,DENG Yi-mei,TAN Xiang-shao,et al.Research on the variation regularities of microstructures in the testing of interaction between soft rocks and water[J].Acta Scientiarum Naturalium Universities Sun Yatsen,2004,42(4):98-102.
[9]柴肇云,康天合,李义宝.物化型软岩微结构单元特征及其胀缩性研究[J].岩石力学与工程学报,2006,25(6):1265-1269.CHAI Zhao-yun,KANG Tian-he,LI Yi-bao.Study on microstructure unit character and its swell-shrink property for physico-chemical soft rock[J].Chinese Journal of Rock Mechanics and Engineering,2006,25(6):1265-1269.
[10]周翠英,邓毅梅,谭详韶,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 mechanical properties of saturated soft rocks and application[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(1):33-38.
[11]MARKUS TULLER,DANI OR.Hydraulic functions for swelling soils:pore scale considerations[J].Journal of Hydrology,2003,272(1-4):50-71.
[12]陈颙,郑洁.分形与混沌——在地质学和地球物理学中的应用[M].北京:地震出版社,1993.
[13]BUSHEV M.Synergetics,chaos,order,self-organ-ization[M].Shagapore:World Scientific,1994:1-275.
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