地下水对板岩微观结构变化的影响研究
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摘要
为分析板岩遇水劣化机理,进行了板岩饱水软化的微观机理与宏观力学性质研究。结果表明,在板岩遇水作用过程中,板岩的单轴抗压强度劣化趋势明显,随着饱水压力的增大,单轴抗压强度不断降低;随着板岩遇水作用时间的增加,岩石内部孔隙、裂隙逐渐发育、汇集,矿物颗粒逐渐软化、分解,岩石微观结构逐渐趋于松散;板岩劣化进程中,首先是岩样中胶结物的溶解、溶蚀,然后是失去胶结物包裹的矿物颗粒表面发生水-岩物理化学作用,最后是矿物颗粒本身软化,分解,岩样内部胶结物的溶解、溶蚀对板岩宏观力学性质影响明显。
In order to analyze the water-saturated softening mechanism of slate,the micro-mechanism and macro-mechanical properties of water-saturated softening of slate are studied. The results show that,( a) the uniaxial compressive strength of slate tends to deteriorate obviously during the process of water-saturation,and with the increase of saturation pressure,the uniaxial compressive strength decreases continuously;( b) with the increase of time of slate water interaction,the pore and fissure in rock gradually develop and converge, and the mineral particles gradually soften and decompose, which makes the microstructure of rock gradually loosen;( c) in the process of slate deterioration,the cements in rock samples are firstly dissolved,then the water-rock physical-chemical interaction occurs on the surface of mineral particles without cements,and finally the mineral particles themselves are softened and decomposed. The dissolution of cements in rock samples have obvious effects on the macro-mechanical properties of slate.
In order to analyze the water-saturated softening mechanism of slate,the micro-mechanism and macro-mechanical properties of water-saturated softening of slate are studied. The results show that,( a) the uniaxial compressive strength of slate tends to deteriorate obviously during the process of water-saturation,and with the increase of saturation pressure,the uniaxial compressive strength decreases continuously;( b) with the increase of time of slate water interaction,the pore and fissure in rock gradually develop and converge, and the mineral particles gradually soften and decompose, which makes the microstructure of rock gradually loosen;( c) in the process of slate deterioration,the cements in rock samples are firstly dissolved,then the water-rock physical-chemical interaction occurs on the surface of mineral particles without cements,and finally the mineral particles themselves are softened and decomposed. The dissolution of cements in rock samples have obvious effects on the macro-mechanical properties of slate.
引文
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[10]谭罗荣.蚀变凝灰岩的微观特性与水稳定性的关系[J].岩土工程学报,1990,12(6):70-75.
[11]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,2003,42(4):98-102.
[12]邓华锋,张恒宾,李建林,等.水-岩作用对砂岩卸荷力学特性及微观结构的影响[J].岩土力学,2018,39(7):2344-2352.
[13]念红芬,张春华.乌东德水电站库区板岩遇水软化微观机理及强度模型研究[J].三峡大学学报:自然科学版,2018,6(12):6-10.
[2]HATZOR Y H,ZUR A,MIMRAN Y.Microstructure effects on microcracking and brittle failure of dolomites[J].Tectonophysics,1997,281(3):141-152.
[3]ROBINA H C,WONG K T,WANG C P.Microcracking and grain size effect in Yuen Long marbles[J].International Journal of Rock Mechanics and Mining Sciences,1996,33(5):479-486.
[4]赵永红,黄杰藩,王仁.岩石微破裂发育的扫描电镜即时观测研究[J].岩石力学与工程学报,1992,11(3):284-294.
[5]卢应发,张梅英,葛修润.大理岩静态和循环荷载试件的电镜试验分析[J].岩土力学,1990,11(4):75-80.
[6]刘小明,李焯芬.岩石断口微观断裂机理分析与试验研究[J].岩石力学与工程学报,1997,16(6):509-513.
[7]谭以安.岩爆岩石断口扫描电镜分析及岩爆渐进破坏过程[J].电子显微学报,1989(2):41-48.
[8]倪骁慧,朱珍德,李晓娟,等.循环荷载下花岗岩细观损伤量化试验研究[J].岩土力学,2011,32(7):1991-1995.
[9]朱珍德,黄强,王剑波,等.岩石变形劣化全过程细观试验与细观损伤力学模型研究[J].岩石力学与工程学报,2013,32(6):1167-1175.
[10]谭罗荣.蚀变凝灰岩的微观特性与水稳定性的关系[J].岩土工程学报,1990,12(6):70-75.
[11]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,2003,42(4):98-102.
[12]邓华锋,张恒宾,李建林,等.水-岩作用对砂岩卸荷力学特性及微观结构的影响[J].岩土力学,2018,39(7):2344-2352.
[13]念红芬,张春华.乌东德水电站库区板岩遇水软化微观机理及强度模型研究[J].三峡大学学报:自然科学版,2018,6(12):6-10.