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砂岩水物理化学损伤机制研究

期刊名称：岩石力学与工程学报, 2007.10, 26(10): 2117- 2124
时间：0
分类：TU45[建筑科学—岩土工程;建筑科学—土工工程]
作者机构：[1]中国科学院武汉岩土力学研究所,岩土力学与工程国家重点实验室,湖北,武汉,430071 中国科学院武汉岩土力学研究所,岩土力学与工程国家重点实验室,湖北,武汉,430071 中国科学院武汉岩土力学研究所,岩土力学与工程国家重点实验室,湖北,武汉,430071
相关基金：国家自然科学基金资助项目(50479072,40672192);国家自然科学基金重点项目(50539090)
相关项目：应力－水物理化学耦合作用下岩体流变特性的试验与理论研究

关键词：岩石力学, 砂岩, 水物理化学作用, 损伤机制, 次生孔隙率, CT扫描, Cements, Diffusion, Groundwater, Mechanical properties, pH, Porosity, Rock mechanics

中文摘要：

通过对不同水环境下砂岩孔隙率、pH值演变和矿物蚀变等开展一系列的试验研究,从微细观层次分析砂岩的水物理化学损伤机制,在此基础上,提出以蒸馏水环境下测得的次生孔隙率为基础,从总次生孔隙率中将水化学作用产生的次生孔隙率分离出来的方法,进而建立基于次生孔隙率变化的砂岩水物理化学损伤变量表达式;另一方面,通过对浸泡180 d时的砂岩试件进行CT扫描,将损伤计算结果与CT检测结果进行了对比分析.研究结果表明,砂岩水物理损伤主要受水流导致的矿物颗粒间胶结物与碎屑运移和扩散影响,与水化学损伤与离子浓度、pH值等水环境变化密切相关;二者所诱发的次生空隙是水物理化学作用影响砂岩力学性质的主要原因;水-岩反应后某一时刻砂岩的总次生孔隙率可由水物理作用和水化学作用产生的次生孔隙率两部分构成.砂岩水物理化学损伤计算结果与CT检测结果的对比分析表明,采用所提出的砂岩损伤变量表达式来描述其水物理化学损伤是可行的.

英文摘要：

A series of tests on evolution of the porosity, pH value, as well as the mineral composition of sandstone under different water flow environments are conducted; and the micro-and meso-mechanisms of hydro-physico-chemical damage of sandstone are analyzed. Accordingly, a method is suggested, by which the secondary porosity individually induced by hydro-chemical interaction can be separated from the total secondary porosity through introducing the test value of secondary porosity of sandstone specimen under distilled water environment. And thereby, a representation of damage variable demonstrating the hydro-physico-chemical effect of sandstone is provided based on the variety of secondary porosity. Moreover, the CT scanning tests on the sandstone specimen with hydro-physico-chemical interaction of 180 days are carried out. The study reveals that the hydro-physical damage is mainly affected by the transfer and diffusion of cement materials, and debris in and around the pore of rock, and closely related to the hydro-chemical damage by the ion concentration and pH value in water solution. The varieties of mechanical behavior of sandstone induced by the hydro-physicochemical interaction are dominantly resulted from the secondary porosity, which can be divided into two parts, respectively caused by the hydro-physical and hydro-chemical effects. The comparison of the calculated damage values and CT values demonstrates that the representation of damage variable of sandstone is feasible.

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