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| 1 | 中国冲击地压灾害防治体系的现状及发展显示文摘深地资源开发是我国未来科技发展的重要方向。随着煤矿开采深度的增加,冲击地压灾害频发,严重威胁矿井的安全、高效开采。因此,对冲击地压发生机理、监测预警及卸压减冲技术的研究尤为重要。本文首先以时间为顺序综述了煤矿冲击地压的发生机理,明确了理论之间的联系。基于此,从试验角度对冲击地压机理进行总结,细化了冲击地压发生机理及类型,提出煤岩体材料效应和结构效应是冲击地压发生的关键影响因素。随后,针对几种类型的发生机理,利用综合微震、应力监测、电磁辐射和地音监测等手段和方法,比较分析了现有冲击地压监测预警系统存在的局限性。基于此,提出了将前兆信息在时间和空间上进行融合,并以特征向量作为权重,建立冲击地压前兆识别大数据分析及综合监测预警系统。最后,针对我国在冲击地压防治工作中面临的监测精度不足、复杂环境难以控制、卸压减冲方案优化不足、支护方法不理想等问题,提出了未来防治冲击地压的建议,为防治冲击地压发生提供参考。 | 吴少康 张俊文 宋治祥 范文兵 张杨 董续凯 张玉杰 阚宝华 陈志松 张际涛 马世杰 | 2023 | Journal of Central South University2023，30，11： | 1 |
| 2 | Generic creep behavior and creep modeling of an aged surface support liner under tension显示文摘Polymer-based materials have been motivated to be an alternative support system element in the mining/tunneling industry due to their logistic and geotechnical benefits.Thin spray-on liner(TSL),a term to define the application of the material on the rock surface with a layer ranging from 2 mm to10 mm in thickness,shows some promising results.TSLs are mainly composed of plastic,polymer,or cement-based ingredients to a certain proportion.This study intends to reveal the time-dependent response of TSL specimens,cured throughout 500 d,under four constant stress levels for stable laboratory conditions.The results were correlated using two interrelated equations to predict the material’s service life(creep-rupture envelopes).The proposed correlations offered an insight into both the effective permanent support time and the strain amount at the liner failure.The time-dependent deformation of TSL,whose performance is highly responsive to creep behavior,was obtained so that the design engineers may use the findings to avoid the severe problems of material creep.Experimental data were also used to develop a Burgers(four-element)creep model.Since the liner has a nonlinear time-dependent behavior,creep models were built for each stress level separately.Subsequently,a generic equation was obtained using the nonlinear parametric dependencies.There is a good agreement between the proposed model and the experimental results.The proposed model can be used as a basis for future numerical studies related to the support behavior of aged surface support liners. | D.Guner O.Golbasi H.Ozturk | 2022 | Journal of Rock Mechanics and Geotechnical Engineering2022，14，2： | 1 |
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