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针对板岩裂隙渗流特性受水化学腐蚀影响规律尚不明确的现状,以大连地区的板岩为研究对象,开展了板岩贯通裂隙受水化学溶液(NaCl,HCl,NaOH)腐蚀的渗透特性试验研究。首先通过对浸泡贯通裂隙试件的SEM扫描和浸泡溶液PH值对比,分析了水-岩作用对裂隙板岩微细观结构的影响机制。其次通过不同溶液、不同浸泡时间裂隙试件的渗透性试验,宏观上获得了腐蚀环境下裂隙板岩的渗透性变化规律。再次基于一系列化学反应方程式,将上述宏细观结果进行对比分析,认为裂隙板岩渗透性受水化学腐蚀影响明显,HCl,Na Cl溶液对结构面具有溶蚀作用,增大了其均值隙宽;而NaOH溶液与板岩矿物成分反应生成的稳定沉淀物质,附着、堵塞于裂隙间,使得均值隙宽减小。最后,基于试验数据建立不同溶液板岩渗透系数与浸泡时间的非线性关系,并引入裂隙渗流计算理论公式,采用FLAC~(3D)的fish语言编写板岩裂隙化学-渗流-应力耦合计算程序,计算与试验结果具有较好的一致性。
Aiming at the current situation that the southerly seepage behavior of slate is influenced by water chemical corrosion, the slate rock in Dalian area is studied, and the seepage property test of slate rock through the chemical solution (NaCl, HCl, NaOH) the study. Firstly, the mechanism of water-rock effect on the microstructure of fissured slate was analyzed by comparing the scanning electron microscope (SEM) scanning with that of immersion solution. Secondly, the permeability of fissured slate under corrosive environment was obtained macroscopically through the permeability test of fissures with different solution and immersion time. Again based on a series of chemical reaction equations, the macroscopic and microscopic results are compared and analyzed. It is considered that the permeability of the fractured slate is significantly affected by the chemical corrosion of water. The HCl and NaCl solutions have a dissolution effect on the structural surface and increase the mean gap width ; While the stable precipitation material formed by the reaction between NaOH solution and slate mineral components adheres and blocks in the cracks, so that the mean gap width decreases. Finally, based on the experimental data, the nonlinear relationship between the permeability coefficient and the immersion time of different solution slate was established, and the theoretical formula of seepage calculation of fractures was introduced. The calculation program of scrip chemistry - seepage - stress coupling was programmed with FLAC 3D fish language, Calculation and test results have good consistency.