深部巷道底板岩体渗透性高压压水试验研究

黄震; 姜振泉; 孙强; 曹丁涛; 王言剑; 张冬

doi:10.11779/CJGE201408021

深部巷道底板岩体渗透性高压压水试验研究 English Version

1. 中国矿业大学资源与地球科学学院,江苏徐州 221116; 2. 兖州煤业股份有限公司,山东邹城 273500; 3. 兖州煤业股份有限公司东滩煤矿,山东邹城 273512

基金项目: 国家重点基础研究发展计划（973计划）（2013CB036003）

详细信息

作者简介:
黄震(1989- ),男,江西大余人,博士研究生,主要从事岩土工程和水文地质工程地质方面的研究。E-mail: huangzhen075@163.com。

中图分类号: TU452
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出版历程
- 收稿日期: 2014-01-05
- 发布日期: 2014-08-18

High-pressure water injection tests on permeability of deep rock mass under tunnels

1. School of Resources and Earth Science, China University of Mining and Technology, Xuzhou 221116, China; 2.Yanzhou Coal Mining Co., Ltd., Yanzhou Coal Mining Company, Zoucheng 273500, China; 3. Dongtan Coal Mine, Yanzhou Coal Mining Co., Ltd., Zoucheng 273512, China

摘要

摘要: 岩体渗透性是反映岩体水力学特征的重要参数,为探究深部岩体的渗透性,采用钻孔高压压水试验手段,对东滩煤矿深部巷道底板四段岩体进行了现场原位压水试验,获得了大量实测数据。试验和数据分析结果表明：岩体在压水过程中经历了“隔水-导渗-稳渗”的过程,随着压水的进行,岩体的渗透性不断增强。东滩煤矿深部底板的厚层泥岩具有低阻弱渗的特点,厚层砂岩和互层具有高阻弱渗的特点,四段岩体原始状态下渗透性均较差。注水压力与流量关系曲线具有很好的指数关系,除厚层砂岩外,厚层泥岩和互层的注水压力-流量关系具有明显的分段性。岩体等效裂隙宽度随着注水压力的增大具有较好的指数关系且具有明显的分段性,即可分为突变点前的稳定阶段和突变点后的突增阶段。可通过裂隙宽度变化量是否大于0来判断岩体内是否发生明显渗流。研究结果有助于加强对深部岩体在水压作用渗透性变化的认识,为深部煤层的安全开采提供重要的参考依据。
- 深部岩体 /
- 高压压水试验 /
- 渗透性 /
- 等效裂隙宽度 /
- 立方定律 /
- 指数关系
Abstract: The permeability is a very important factor to determine the hydraulic characteristics of rock mass. To study the permeability of deep rock mass, high-pressure borehole water injection tests are carried out to analyze the four segments of rock masses in Dongtan Coal Mine, and numerous data are obtained. The test results and analyses of data show that the rock mass goes through the process of “water resistance-seepage guiding-stable seepage”. The permeability of rock mass increases with the test process. The thick mudstone under the tunnel of Dongtan Coal Mine exhibits the behavior of low water anti-pressure and permeability, while the thick sandstone and other two rock masses show that of high water anti-pressure and low permeability. The four test rock masses are of low permeability. The regression results indicate the exponential relationship between injection pressure and flow rate with high regression coefficients. The curves of injection pressure and flow rate of thick mudstone and interbed exhibit significant segmentation expect those of thick sandstone. The relationship between injection pressure and equivalent fracture width shows obvious exponential relationship as well, and two significant segmentations appear, that is, stability before mutation and sudden increase after mutation. Whether seepage in the rock mass happens or not can be judged by the relation between and 0. The conclusions will help further understand the permeability of deep rock masses under high water pressure and may make an important reference for safety mining of deep coal mines.
- deep rock mass /
- high-pressure water injection test /
- permeability /
- equivalent fracture width /
- cubic law /
- exponential relationship

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