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NPR锚杆/索围岩动力响应数值模拟分析
引用本文:郭隆基,何满潮,瞿定军,陶志刚. NPR锚杆/索围岩动力响应数值模拟分析[J]. 东北大学学报(自然科学版), 2022, 43(8): 1159-1167. DOI: 10.12068/j.issn.1005-3026.2022.08.013
作者姓名:郭隆基  何满潮  瞿定军  陶志刚
作者单位:(1. 中国矿业大学(北京) 深部岩土力学与地下工程国家重点实验室, 北京100083; 2. 中国矿业大学(北京) 力学与建筑工程学院, 北京100083; 3. 远安县燎原矿业有限责任公司, 湖北 宜昌444200)
基金项目:国家自然科学基金资助项目(41941018).
摘    要:为了解决深部开采造成的冲击地压、大变形和常规锚杆/索破断失效等问题,本文以某煤矿釆区为研究试验段,基于高地应力软岩大变形破坏机理,采用FLAC3D-PFC3D耦合建模方法首次开展NPR锚杆/索动力学数值模拟研究,建立PR和NPR锚杆/索两种支护方案的数值模型,对比分析动荷载下硐室围岩以及锚杆的受力、位移情况.结果表明:25MPa冲击荷载下,25根PR支护锚杆/索中21根已失效,围岩大面积失稳,耦合墙出现严重变形,硐室呈现内凸弧形变形破坏.而相同条件下,NPR锚杆/索均未失效,硐室围岩稳定性保持良好.

关 键 词:冲击地压;NPR锚杆/索;围岩支护;FLAC3D;硐室稳定性  
修稿时间:2021-06-12

Numerical Simulation of Dynamic Response of Surrounding Rock Anchored by NPR Bolt/Cable
GUO Long-ji,HE Man-chao,QU Ding-jun,TAO Zhi-gang. Numerical Simulation of Dynamic Response of Surrounding Rock Anchored by NPR Bolt/Cable[J]. Journal of Northeastern University(Natural Science), 2022, 43(8): 1159-1167. DOI: 10.12068/j.issn.1005-3026.2022.08.013
Authors:GUO Long-ji  HE Man-chao  QU Ding-jun  TAO Zhi-gang
Affiliation:1. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology
Abstract:In this paper, a coal mine is used as the research region to study the problems caused by deep mining, such as rock burst, large deformation and failure of conventional bolt/cable. Based on the large deformation failure mechanism of high in-situ stress soft rock, the FLAC3D-PFC3D coupling modeling method was used to carry out the dynamic numerical simulation study of NPR (negative Poisson’s ratio) bolt/cable for the first time. Numerical models of two support schemes of PR and NPR bolt/cable were established, and the stress and displacement of the surrounding rock of the chamber and the bolt/cable under dynamic loads were compared and analyzed. The results show that under the impact load of 25MPa, 21 of the 25 PR support bolts/cables failed, the surrounding rock was damaged in a large area, the coupling wall was severely deformed, and the chamber presented inner convex arc-shaped deformation and failure. Under the same conditions, none of the NPR bolts/cables failed, and the stability of the surrounding rock of the chamber remained good.
Keywords:rock burst   NPR bolt/cable   surrounding rock support   FLAC3D   chamber stability,
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