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Fracture Characteristics of Overlying Bedrock and Clay Aquiclude Subjected to Shallow Coal Seam Mining

机译：浅埋煤层开采上覆基岩和黏土含水层的断裂特征

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摘要

Some of the coal deposits in the northwest region of China are at relatively shallow depths, covered by a thin layer of bedrock and a thick layer of wind-blown sand. We studied the mechanics and permeability of a clay aquiclude by X-ray diffraction and triaxial loading tests and the fracturing of the overlying bedrock and aquiclude in physical simulation tests. The results indicate that if the bedrock thickness is 90m or more, the height, distribution pattern, and damage to the water-conducting fractured and caving zones (belts) are normal. If the bedrock thickness is 30m or less, the three belts make one phenomenon occurs, and caving extends into the soil layer; the overlying rock is completely perforated by vertical fractures and the collapse spreads to the surface. When the bedrock thickness is between 30 and 90m, the height of the water-conducting fractured zone is inhibited by the weathered rock and cohesive soil layers, and the height of the two belts is significantly decreased. This can be used to prevent and control coal mine water hazard.
机译：中国西北地区的一些煤层深度相对较浅，被基岩薄层和风吹沙层所覆盖。我们通过X射线衍射和三轴载荷试验研究了粘土含水层的力学和渗透性，并在物理模拟试验中研究了上覆基岩和含水层的破裂。结果表明，如果基岩厚度为90m或以上，则其高度，分布模式以及对导水裂缝和崩塌带（带）的破坏都是正常的。如果基岩厚度为30m以下，则三个带会发生一种现象，并且崩落会延伸到土壤层中。上覆的岩石被垂直裂缝完全打穿，塌陷扩散到地面。当基岩厚度在30到90m之间时，导水裂缝带的高度受到风化岩石和粘性土层的抑制，两条带的高度显着降低。这可用于预防和控制煤矿的水灾。

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  • 来源
    《Mine water and the environment》 |2019年第1期|136-147|共12页
  • 作者

    Liu Zhiguo; Fan Zhenli; Zhang Yujun;

  • 作者单位

    China Coal Res Inst, Coal Min & Designing Branch, Beijing 100013, Peoples R China|Tiandi Sci & Technol Co Ltd, Coal Ming & Designing Dept, Beijing 100013, Peoples R China;

    China Coal Res Inst, Coal Min & Designing Branch, Beijing 100013, Peoples R China|Tiandi Sci & Technol Co Ltd, Coal Ming & Designing Dept, Beijing 100013, Peoples R China;

    China Coal Res Inst, Coal Min & Designing Branch, Beijing 100013, Peoples R China|Tiandi Sci & Technol Co Ltd, Coal Ming & Designing Dept, Beijing 100013, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Water hazard; Mining disturbance; Fracture evolution; Water-conducting fractured zone;

    机译：水害;采矿扰动;裂缝演化;导水裂隙带;

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