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主管单位 中华人民共和国
工业和信息化部
主办单位 哈尔滨工业大学 主编 冷劲松 国际刊号ISSN 0367-6234 国内刊号CN 23-1235/T

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引用本文:吴疆宇,冯梅梅,陈占清,郁邦永,韩观胜.溶蚀作用对破碎泥岩渗透特性的影响[J].哈尔滨工业大学学报,2019,51(2):117-125.DOI:10.11918/j.issn.03676234.201711027
WU Jiangyu,FENG Meimei,CHEN Zhanqing,YU Bangyong,HAN Guansheng.Dissolution effects on the seepage property of broken mudstone[J].Journal of Harbin Institute of Technology,2019,51(2):117-125.DOI:10.11918/j.issn.03676234.201711027
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溶蚀作用对破碎泥岩渗透特性的影响
吴疆宇1,2,冯梅梅1,2,陈占清1,2,郁邦永1,韩观胜1
(1.深部岩土力学与地下工程国家重点实验室(中国矿业大学),江苏 徐州 221116; 2.中国矿业大学 力学与土木工程学院,江苏 徐州 221116)
摘要:
为研究溶蚀作用对破碎岩石渗透特性的影响,研制一种可测量质量流失条件下破碎岩石渗透特性的试验系统.在破碎泥岩的渗透试验中掺入岩盐模拟自然条件下存在的溶蚀现象,加速溶蚀过程.讨论溶蚀作用下破碎泥岩渗透特性的演化规律,分析溶蚀作用下渗透压力、岩盐质量和泥岩颗粒粒径对破碎泥岩渗透特性的影响.结果表明:溶蚀作用导致破碎岩石内易溶物质和细小颗粒的流失极易破坏岩样内部的孔隙结构和骨架结构,由此造成结构内部导水通道的扩大和渗透参数的突增.其渗透参数基本与渗透压力、岩盐质量和泥岩颗粒粒径呈正相关关系.且对于渗透压力较大、岩盐质量较高和泥岩颗粒粒径较大的岩样,由于溶蚀作用的存在容易发生更明显的导水通道扩大现象.此外,在岩样的渗流过程中,也存在由于颗粒迁移导致的导水通道堵塞造成的渗透参数逐渐减小的现象.
关键词:  渗流  破碎岩石  溶蚀  质量流失  颗粒迁移
DOI:10.11918/j.issn.03676234.201711027
分类号:TU45
文献标识码:A
基金项目:国家自然科学基金(51404266)
Dissolution effects on the seepage property of broken mudstone
WU Jiangyu1,2,FENG Meimei1,2,CHEN Zhanqing1,2,YU Bangyong1,HAN Guansheng1
(1.State Key Laboratory for Geomechanics & Deep Underground Engineering (China University of Mining & Technology), Xuzhou 221116, Jiangsu, China; 2. School of Mechanics & Civil Engineering, China University of Mining & Technology, Xuzhou 221116, Jiangsu, China)
Abstract:
In order to study the effect of dissolution on the seepage property of broken rock, an experimental system for testing the seepage property of broken rock under the condition of mass loss was designed. The halite was added in the broken mudstone to simulate the dissolution phenomena in nature, which can accelerate the dissolution process. The evolution law of seepage property of broken mudstone under dissolution was discussed. The effects of seepage pressure, halite content, and particle size of mudstone on the permeability of broken mudstone under dissolution were analyzed. The results show that dissolution caused loss of soluble matters and fine particles in broken rock to damage the pore structure and framework structure inside that specimen easily, thereby resulting in the expansion of underground watercourse in structure and the sharp increase of permeability parameters. The permeability parameters were positively related to the seepage pressure, halite content, and particle size of mudstone. For the rock specimen with greater seepage pressure, higher halite content, and larger particle size of mudstone, the more obvious expansion of underground watercourse tended to occur due to dissolution. In addition, in the seepage process of rock specimens, the watercourse blockage caused by the particles migrations also occurred, which results in the gradual decrease of permeability parameters.
Key words:  seepage  broken rock  dissolution  mass loss  particle migration

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