不同开采方式下煤岩应力场-裂隙场-渗流场行为研究
煤岩的采动力学行为与常规的煤岩材料力学行为有本质不同,传统的岩石力学实验研究没能体现开采方式和工程扰动的真实影响。深部煤与瓦斯共采实践中,不同开采方式扰动下的煤岩应力场、裂隙场和渗流场行为有显著差异,但煤岩采动力学行为特征尚缺乏科学的、定量化的分析和表达。通过开展不同开采方式下煤岩采动力学实验,分析3种典型开采方式下煤岩采动力学行为、采动裂隙展布及增透率演化规律,探索不同开采方式下煤岩真实采动应力场、裂隙场和渗流场的特征差异。研究表明:不同开采方式产生不同的采动应力场,并导致不同的煤岩裂隙场和渗流场行为特征差异;不同开采方式条件下煤岩峰值应力、峰值应力对应轴向应变和环向应变按照无煤柱开采、放顶...
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Published in | 煤炭学报 Vol. 41; no. 10; pp. 2405 - 2417 |
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Main Author | |
Format | Journal Article |
Language | Chinese |
Published |
2016
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Subjects | |
Online Access | Get full text |
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Summary: | 煤岩的采动力学行为与常规的煤岩材料力学行为有本质不同,传统的岩石力学实验研究没能体现开采方式和工程扰动的真实影响。深部煤与瓦斯共采实践中,不同开采方式扰动下的煤岩应力场、裂隙场和渗流场行为有显著差异,但煤岩采动力学行为特征尚缺乏科学的、定量化的分析和表达。通过开展不同开采方式下煤岩采动力学实验,分析3种典型开采方式下煤岩采动力学行为、采动裂隙展布及增透率演化规律,探索不同开采方式下煤岩真实采动应力场、裂隙场和渗流场的特征差异。研究表明:不同开采方式产生不同的采动应力场,并导致不同的煤岩裂隙场和渗流场行为特征差异;不同开采方式条件下煤岩峰值应力、峰值应力对应轴向应变和环向应变按照无煤柱开采、放顶煤开采和保护层开采的顺序降低,而体积应变绝对值则依次升高;不同开采方式下煤岩采动裂隙尺度分维D及煤层增透率激增点与工作面之间的距离(L_(rise))均按照保护层开采、无煤柱开采、放顶煤开采的顺序依次下降,确定煤层L_(rise)范围和增透率空间分布可为煤瓦斯共采工程提供理论指导。 |
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Bibliography: | XIE He-ping1 , ZHANG Ze-tian1 , GAO Feng2, ZHANG Rul , GAO Ming-zhong1 , LIU Jian-feng1 (1. Sichuan University, Chengdu 610065, China;2. State Key Laboratory for Geomechinics and Deep Underground Engineering, China University of Mining and Technology,Xuzhou 221116, China) coal; mining layouts; mining-induced stress; mechanical behavior; mining-induced fracture; mining-induced coal permeability change ratio There are essential differences between the mining-induced mechanical behavior and the material behavior of coal,but the significant influences of mining layouts and mining-induced disturbance are not reflected and considered in traditional rock mechanics researches.In deep underground coal and gas simultaneous extraction practices,the stress-fracture-seepage field behavior of coal under different mining layouts are of significant difference,and there is still a lack of scientific and quantitative analysis and expression on the mining-induced mechanical behavior of coal.To investigate the stress-fracture-seep |
ISSN: | 0253-9993 |