考虑围岩离层影响的端部锚固锚杆荷载分析及其支护设计

采矿与安全工程学报 ›› 2015, Vol. 32 ›› Issue (5): 760-764.

考虑围岩离层影响的端部锚固锚杆荷载分析及其支护设计

西安科技大学建筑与土木工程学院，陕西西安 710054

收稿日期:2013-12-01 出版日期:2015-09-15 发布日期:2019-09-02
作者简介:谷拴成(1963—)，男，陕西省宝鸡市人，博士，教授，主要从事岩土工程支护与加固方面的研究。
基金资助:
国家自然科学基金项目(51508462)；陕西省教育厅科研项目(2013JK0961)

The analysis of end anchoring-grouting prestressed anchor loading and support design with bed separation considered

Received:2013-12-01 Online:2015-09-15 Published:2019-09-02

摘要/Abstract

摘要： 在煤矿巷道开挖过程中，巷道围岩变形不协调常常会产生顶板离层，围岩离层对锚杆加固影响程度的分析直接影响支护工程的安全性。基于拉拔荷载作用下锚杆锚固段的受力分布规律，综合考虑端部锚固锚杆预紧力作用及离层产生的附加荷载，得出含有离层的系统锚杆受力分布形式。结果表明：离层影响下，锚固体的轴力和界面剪应力均会增大，离层值过大时锚杆很容易失效，产生安全隐患。最后将离层影响考虑到煤矿锚固设计中，提出了新的巷道支护设计思路，通过分析发现考虑离层后的承载力设计方法更安全合理。

关键词: 顶板离层, 端部锚固, 预紧力, 锚杆荷载, 支护设计

Abstract: Roof bed separation often occurs due to the deformation incoordination of surrounding rock in the process of the excavation of mine roadway. Bed separation has effect on the bolts, and the estimation of the influence will directly affect the safety of support systems. The stress distributions of systematic bolt has been obtained, considering the pre-tightening force of end anchoring-grouting bolt and the additional stress caused by roof bed separation. The results have shown that under the influence of roof bed separation, anchorage axial force and shear stress will all increase．Anchor failure happens easily when bed separation value is too large, which will produce the potential safety hazard. Finally, the effects of bed separation have been taken into consideration in the bolting design, and a new bolt design concept has been provided. It has been proved that the bearing capacity design method after considering roof bed separation is safer and more reasonable．

Key words: roof bed separation, end anchoring-grouting, prestress, bolt loading, supporting design

谷拴成，丁潇. 考虑围岩离层影响的端部锚固锚杆荷载分析及其支护设计[J]. 采矿与安全工程学报, 2015, 32(5): 760-764.

GU Shuancheng，DING Xiao. The analysis of end anchoring-grouting prestressed anchor loading and support design with bed separation considered[J]. Journal of Mining & Safety Engineering, 2015, 32(5): 760-764.

[1]	兰奕文，严红，邢鹏飞，李天彤. 特厚煤层强采动巷道顶板全锚索控制系统研究[J]. 采矿与安全工程学报, 2018, 35(2): 276-283.
[2]	孙学阳，付恒心，寇规规，刘亮东，李鹏强，苗霖田. 综采工作面顶板次生离层水害形成机理分析[J]. 采矿与安全工程学报, 2017, 34(4): 678-683.
[3]	卢爱红，徐金海，胡善超. 预紧力对锚杆锚固系统横向振动频率的影响分析[J]. 采矿与安全工程学报, 2017, 34(4): 684-688.
[4]	谢建林，许家林. 地质雷达探测顶板离层的数值与物理模拟研究[J]. 采矿与安全工程学报, 2017, 34(2): 317-322.
[5]	李学华，鞠明和，贾尚昆，种照辉. 沿空掘巷窄煤柱稳定性影响因素及工程应用研究[J]. 采矿与安全工程学报, 2016, 33(5): 761-769.
[6]	付玉凯. 锚杆杆尾扭矩与预紧力相互转化的影响因素研究[J]. 采矿与安全工程学报, 2016, 33(5): 800-805.
[7]	常聚才, 谢广祥. 锚杆预紧力对煤矿巷道支护效果的响应特征研究[J]. 采矿与安全工程学报, 2012, 29(5): 657-661.
[8]	王宏伟, 姜耀东, 赵毅鑫. 软弱破碎围岩高强高预紧力支护技术与应用[J]. 采矿与安全工程学报, 2012, 29(4): 474-480.
[9]	郑西贵, 张农, 薛飞. 预应力锚杆锚固段应力分布规律及分析[J]. 采矿与安全工程学报, 2012, 29(3): 365-370.