深部软岩易风化巷道支护数值模拟研究.pdf

第41卷第2期
矿安金与保
2014年4月
MINING SAFETY ENVIRONMENTAL PROTECTI
Apr. 20
p
李树刚,张晋海,成连华,等,深部软岩易风化巷道支护数值模拟研究[J]J.矿业安全与环保,2014,41(2):1-4.
文章编号:1008-495(2014)02-0001-04
试验研究
深部软岩易风化巷道支护数值馍拟研究
李树刚',张晋海2,成连华',林海飞',李志梁
(1.西安科技大学能源学院,陕西西安710054;2.山西晋城煤业集团巴愣煤矿,内蒙古鄂尔多斯017000
摘要:针对深部软岩易风化巷道围岩变形破坏的特点及其支护难点,采用理论分析和数值模拟的方
法,分析了其巷道变形破坏的机理,认为该类巷道处于高地应力环境,围岩自身强度低、承载能力弱,具
有流变性,易风化,导致巷道维护困难。控制原则是全断面整体支护、及时封闭,采用高预应力强力錨杆
支护将围岩加固成整体,提高围岩强度及其承載能力,有效抵抗流变变形,并及时喷浆封闭围岩阻止风
化发展,配以U型钢加强支护,对底鼓严重地段进行反底拱支护的综合支护措施。措施实施后巷道底鼓
量降低了67.1%,顶板下沉量降低48.4%,两帮变形量降低52.6%,有效地控制了巷道的失稳。
关键词:深部软岩;易风化岩体;巷道支护;数值模拟
中图分类号:TD313
文献标志码:B
网络出版时间:2014-03-3111:53
网络出版地址http://www.cnki.net/kems/detail/50.1062.TD.20140331.1153.004.html
Numerical Simulation Study of Easy-weathering Roadway
Support in Deep Soft Rock Strata
L/ Shugang ZHANG Jinhai,, CHENG Lianhua LM Hadfei L Zhiliang
I. School of Energy, Xi an University of Science and Technology, Xi an 710054, China
2. Balen Coal Mine of Sha Jincheng Anthracite Mining Group, Ordos 7000, China
Abstract: To counter to the features of easy weathering of deep soft rock strata, the deformation and failure of the roadway
surounding rock and the difficult support of the roadway, the mechanism of roadway deformation and failure was analyzed with the
method of theoretical analysis and numerical simulation. The analysis indicated that this kind of roadway was in a high strata stres
environment, with low strength and weak bearing capacity of the surrounding rock, had the rheological property and was easy to
weather, which often cause the roadway to e difficultly maintained. The conrol measures included the full-face support, timely
enclosing the whole section, supporting the surrounding rock into a whole with pre-stressed high-strength bolts, improving the
strength and bearing capacity of surrounding rock, effectively preventing rheological deformation, and timely guniting to enclose
the weathered surrounding rock, using U-shaped steel to reinforce the st
ting the floor heave
th
inverted arch. Using above support techniques can reduce the floor heave amount by 67. 1%, the roof convergence by 48.4% and
the deformation amount of two rib-sides by 52.6%, the roadway destability was under effective control
Key words: deep soft rock; easy-weathering rock roadway support; numerical simulation
目前,我国煤矿采深以8~12m/a的速度增
收稿日期:2013-07-01;:2014-01-06修订
加2),深部开采是我国煤矿开采发展的必然趋势。
基金项目:国家自然科学基金项目(51174157,51174158,
巷道埋深增加,使巷道围岩处于“三高一扰动”的复
51104113,51204134);映西省自然科学基础硏究计划项目
杂地质力学环境之中,使深部岩体的组织结构、基本
(2011JQ7015);映西省教育斤科学研究项目(2013JK0865,
2013JK0876
行为特征和工程响应发生了根本性变化,也是导致
作者简介:李树刚(1963-),男,甘肃会宁人,博士,教授,
深部岩体灾害频繁发生和程度加剧的根本性原
博士生导师,现任西安科技大学副校长,主要从事矿山安全科
因]。对此,目前主要采用的支护方法有U型钢全
学与工程、采动矿山压力及其控制,围岩活动与瓦斯运移、牒断面支护、壁后充填、锚网带喷注联合支护等,在巷
层自燃间的关系及控制,非稳态渗流力学等领域的研究工作。
道断面方面选择承受力较好的拱形或圆形断面。但