[1]王红胜,赵杨阳,李 磊,等.综放大跨度三心微拱形开切眼围岩破坏机理与控制技术[J].西安科技大学学报,2020,(01):49-57.
 WANG Hong-sheng,ZHAO Yang-yang,LI Lei,et al.Failure mechanism and control technology of surrounding rock of three-centered-micro-arched large span open-off cut in fully-mechanized caving mining face[J].Journal of Xi'an University of Science and Technology,2020,(01):49-57.
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综放大跨度三心微拱形开切眼围岩破坏机理与控制技术(/HTML)
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西安科技大学学报[ISSN:1672-9315/CN:61-1434/N]

卷:
期数:
2020年01期
页码:
49-57
栏目:
出版日期:
2020-02-15

文章信息/Info

Title:
Failure mechanism and control technology of surrounding rock of three-centered-micro-arched large span open-off cut in fully-mechanized caving mining face
文章编号:
1672-9315(2020)01-0049-09
作者:
王红胜12赵杨阳1李 磊12郭卫彬12朱广安12肖双双12
(1.西安科技大学 能源学院,陕西 西安 710054; 2.西安科技大学 冲击地压防治研究所,陕西 西安 710054)
Author(s):
WANG Hong-sheng12ZHAO Yang-yang1LI Lei12GUO Wei-bin12ZHU Guang-an12XIAO Shuang-shuang12
(1.College of Energy Science and Engineering,Xi'an University of Science and Technology,Xi'an 710054,China; 2.Institute of Rock Burst Prevention and Control,Xi'an University of Science and Technology,Xi'an 710054,China)
关键词:
三心微拱形 综放开采 大跨度开切眼 软厚煤层 破坏机理
Keywords:
TCMA fully-mechanized caving mining large span OC soft and thick coal seam failure mechanism
分类号:
D 353.6
文献标志码:
A
摘要:
针对松软厚煤层综放大跨度开切眼围岩控制难题,以魏家地煤矿2303工作面开切眼为工程背景,采用数值模拟与现场实践相结合的方法,提出了三心微拱形开切眼断面形状,探讨了三心微拱形开切眼围岩应力分布特征及破坏机理,并与矩形切眼对比分析。结果表明:三心微拱形开切眼的肩角和顶板受力均匀,能够将顶板垂直应力传递到两帮,肩部所受压应力明显减小,未出现较大应力集中现象; 肩角附近围岩主要受到压剪破坏,破坏区域集中,呈“蝶形”分布; 顶板围岩受到拉剪破坏,破坏区域面积减小,围岩相对稳定; 且弧形顶板、肩角有利于锚杆安装。基于三心微拱形开切眼围岩破坏特征,提出了锚杆-锚索-锚网联合支护的围岩控制技术,顶板下沉量减少50%,两帮移近量减少55%; 在2303工作面进行工业性试验,现场实测顶板下沉量为170 mm,两帮相对移近量为220 mm,围岩控制效果良好。
Abstract:
Aiming at the difficult controlling problem of the surrounding rock of large span Open-off Cut(OC)in soft and thick coal seam,the paper put forward three-centered-micro-arched(TCMA)OC,and discussed the stress distribution characteristics and failure mechanism of surrounding rock by numerical simulation and field practice under the engineering background of the NO.2303 working face in Weijiadi coal mine.Compared with rectangular OC,the results show that the stress of TCMAOC is well-distributed on shoulder and roof,which can transfer the vertical stress of the roof to both sides.The stress on the shoulder decreases obviously without causing marked stress concentration.There are compression-shear failure and tension-shear failure of the surrounding rock on shoulder and roof respectively.The failure area on shoulder is relatively concentrated,showing a butterfly-shaped distribution and the failure area on roof decreases.It is helpful for to the stability of surrounding rock of the OC and the installation of anchors.Based on failure characteristics of surrounding rock of the TCMAOC,the bolt-cable-anchor-mesh combined support is put forward to control surrounding rock.The numerical analysis show that the roof subsidence is reduced by 50%,and the approaching amount of the sides by 55%.The industrial test was carried out at No.2303 working face in Weijiadi Coal Mine.The measurement results show that the roof subsidence is 170 mm,and the approaching amount of the sides is 220 mm,a good effect of surrounding rock control.

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备注/Memo

备注/Memo:
收稿日期:2019-05-17 责任编辑:刘 洁
基金项目:国家自然科学基金(51874231,51504184); 国家重点基础研究计划(973)(2015CB251600)
通信作者:崔 峰(1986-),男,河南新乡人,博士,副教授,E-mail:cuifeng9418@163.com
更新日期/Last Update: 2020-02-15