| 深部巷道围岩分区破裂化数值模拟 |
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| 引用本文： | 王红英,张强,张玉军,蒋开法.深部巷道围岩分区破裂化数值模拟[J].煤炭学报,2010,35(4):535-540. |
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| 作者姓名： | 王红英 张强 张玉军 蒋开法 |
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| 作者单位： | 1. 中科院武汉岩土所;
2. 中国矿业大学建筑工程学院 |
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| 基金项目： | 国家自然科学基金面上资助项目(50774082,50804046);;国家重点基础研究发展计划(973)资助项目(2010CB732101);;岩土力学与工程国家重点实验室前沿探索性资助项目(SKLQ008) |
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| 摘 要： | 对应变软化模型岩体的变形机理进行分析，确定了巷道围岩产生分区破裂的前提条件为岩体变形进入峰后塑性及残余破坏阶段。对地下硐室围岩应力变形状态进行FLAC数值模拟，并基于破坏接近度指标对围岩完整状态进行描述。结果表明：分区破裂化与岩体峰后特性密切相关，是应变软化模型特有的属性，理想弹塑性模型并不能产生分区破裂化；计算结果对网格精度具有依赖性，当近巷网格大小为巷道半径的1/60时，巷道围岩出现螺旋带破裂区域，产生分区破裂，而在粗糙网格下则为传统弹塑性环状对称变形；分区破裂化区域受平面内侧压力系数影响显著，分区破坏主要集中在硐室围岩应力较大的方位；分区破裂化是巷道开挖过程中二次应力场在时间和空间重分布的结果。
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| 关 键 词： | 深部岩体 分区破裂 软化模型 网格精度 应力释放 破坏接近度 |
| 收稿时间： | 2009-09-15 |
| 修稿时间： | 2009-11-25 |
Numerical simulation on disintegration of surrounding rock mass in deep mine roadways |
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| WANG Hong-ying,ZHANG Qiang,ZHANG Yu-jun,JIANG Kai-fa.Numerical simulation on disintegration of surrounding rock mass in deep mine roadways[J].Journal of China Coal Society,2010,35(4):535-540. |
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| Authors: | WANG Hong-ying ZHANG Qiang ZHANG Yu-jun JIANG Kai-fa |
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| Affiliation: | 1.State Key Laboratory of Geomechanics and Geotechnical Engineering/a>;Institute of Rock and Soil Mechanics/a>;Chinese Academy of Sciences/a>;Wuhan 430071/a>;China/a>;2.School of Civil Engineering and Architecture/a>;Shandong University of Science and Technology/a>;Qingdao 266510/a>;China |
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| Abstract: | Through the rock mass deformation mechanism analysis under strain-softening model,the precondition of zonal disintegration was determined,namely,the rock mass deformation reaches the post-peak softening and residual fracture stage.The excavating roadway deformation was analyzed through FLAC numerical simulation whose intact state was described by failure approach index(FAI),the results show that zonal disintegration is closely related to the post-failure character,and it is peculiar to strain-softening mode... |
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| Keywords: | deep rock mass zonal disintegration strain-softening model mesh precision stress release failure approach index |
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