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Landfill Barrier—Overview and Prospect
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作者 zheng liange Zhao Yongsheng 《Global Geology》 2000年第1期87-98,共12页
Landfill is the primary method of waste disposal. The increasing attention focused on the effect of landfill on environment prompts the development of environmental sound landfill system. As the key parts of landfill,... Landfill is the primary method of waste disposal. The increasing attention focused on the effect of landfill on environment prompts the development of environmental sound landfill system. As the key parts of landfill, the barrier system can provide impermeabilization of leachate and prevent biogas from escaping into the environment. In recent years, the technology pertaining the barrier system developed rapidly. In this paper, new materials used in liners and new concept of barrier construction are reviewed; the mechanisms of leachate through clay liner and geomembrane, the calculation of leaks through liner and the effect of freezing/thaw on liner are discussed. 展开更多
关键词 LANDFILL LINER BARRIER LEACHATE
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低渗透非均质砂砾岩的三维重构与水压致裂模拟 被引量:19
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作者 鞠杨 杨永明 +4 位作者 陈佳亮 刘鹏 戴涛 郭迎春 zheng liange 《科学通报》 EI CAS CSCD 北大核心 2016年第1期82-93,共12页
运用?CT成像、X射线衍射等方法,构建了考虑砂砾矿物成分与分布特征的非均质砂砾岩的三维重构模型,采用基于连续介质的离散元程序(CDEM)模拟分析了不同水平地应力下砂砾岩水力压裂裂缝的起裂与扩展行为.通过与均质砂岩计算结果的对比,阐... 运用?CT成像、X射线衍射等方法,构建了考虑砂砾矿物成分与分布特征的非均质砂砾岩的三维重构模型,采用基于连续介质的离散元程序(CDEM)模拟分析了不同水平地应力下砂砾岩水力压裂裂缝的起裂与扩展行为.通过与均质砂岩计算结果的对比,阐述了水平应力比变化和砾石颗粒对砂砾岩压裂裂缝起裂、扩展和空间展布的影响.同时,完成了非均质砂砾岩和均质砂岩物理模型的水力压裂试验,并与数值模拟结果进行了对比.研究表明,砂砾岩的非均质性显著影响压裂裂缝的起裂和扩展行为.相同应力条件下砂砾岩压裂裂缝的起裂压力小于均质砂岩起裂压力,随水平应力比增大两者起裂压力的差异逐渐减小,非均质性强的砂砾岩的起裂压力受水平应力比变化的影响较小.无论非均质砂砾岩或均质砂岩,水平应力比变化均影响压裂裂缝的空间展布和形态. 展开更多
关键词 水力压裂 裂纹扩展 非均质结构 砂砾岩 三维重构
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An experimental investigation on acoustic emission characteristics of sandstone rockburst with different moisture contents 被引量:9
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作者 SUN XiaoMing XU HuiChen +2 位作者 zheng liange HE ManChao GONG WeiLi 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2016年第10期1549-1558,共10页
Rockburst occurred frequently during deep mining in China. The mechanism of rockburst is very complicated and related to many factors. In order to investigate the influence of moisture contents of rockmass on rockburs... Rockburst occurred frequently during deep mining in China. The mechanism of rockburst is very complicated and related to many factors. In order to investigate the influence of moisture contents of rockmass on rockburst, we conducted a series of laboratory rockburst experiments of sandstone under three different moisture contents by the Modified True-Triaxial Apparatus (MTTA),in which the acoustic emission (AE) system was employed to monitor the internal damage of rock mass. A high-speed video camera was utilized to record the detail of rockburst. Based on the experimental results, the AE characteristics, such as AE count,AE energy, and AE frequency, were analyzed. The rockburst process, type, and indensity under different moisture contents were discussed. The research results show that with the increase of moisture contents, rock strength was soften, the elastic and the cumulative damage of the rock were reduced, resulting in a gradual decrease in AE cumulative counts and cumulative energy over the course of rockburst. This study provides an experimental basis and reference for better understanding to the rockburst mechanism and control. 展开更多
关键词 SANDSTONE ROCKBURST moisture contents acoustic emission mechanical characteristics
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基于层状岩体宏细观结构的水力耦合数值模型研究
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作者 刘武 陆倩 +2 位作者 过申磊 郑连阁 袁文俊 《岩石力学与工程学报》 EI CAS CSCD 北大核心 2021年第S01期2851-2860,共10页
基于层状岩体宏细观结构,在热力学框架下推导水力耦合荷载作用下饱水层状岩体的各向异性多尺度损伤模型和渗透性演化方程,进而结合流体流动模拟开源程序TOUGHREACT建立层状岩体水力耦合数值模型。该模型可较好地考虑任意微裂纹损伤扩展... 基于层状岩体宏细观结构,在热力学框架下推导水力耦合荷载作用下饱水层状岩体的各向异性多尺度损伤模型和渗透性演化方程,进而结合流体流动模拟开源程序TOUGHREACT建立层状岩体水力耦合数值模型。该模型可较好地考虑任意微裂纹损伤扩展、滑移剪胀和法向压缩闭合以及层面剪切滑移等力学行为,反映岩体内部微裂纹、层面等不同尺度结构变化对层状岩体水力耦合过程的影响。采用岩石注水试验成果对数值模型的可靠性进行验证,进而开展现场尺度层状岩体注水响应的应用模拟研究。模拟结果表明,注水引起的岩体损伤、水压力增高、层面张开、渗透性演化等水力耦合响应同时受微裂纹和层面结构变化以及层面空间发育特征的影响。层状岩体水力耦合响应的模拟有赖于内部宏细观结构的准确表征。研究成果对水力耦合条件下深部层状围岩工程扰动效应评价具有一定应用价值。 展开更多
关键词 岩石力学 水力耦合 层状岩体 渗透性演化 数值分析 细观力学
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