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Support technology of deep roadway under high stress and its application 被引量:9
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作者 Cao Rihong Cao Ping Lin Hang 《International Journal of Mining Science and Technology》 SCIE EI CSCD 2016年第5期787-793,共7页
Roadway instability has been a major concern in the fields of mining engineering. This paper aims to provide practical and efficient strategy to support the roadways under high in-situ stress. A case study on the stab... Roadway instability has been a major concern in the fields of mining engineering. This paper aims to provide practical and efficient strategy to support the roadways under high in-situ stress. A case study on the stability of deep roadways was carried out in an underground mine in Gansu province, China. Currently,the surrounding rock strata is extremely fractured, which results in a series of engineering disasters, such as side wall collapse and severe floor heave in the past decades. Aiming to solve these problems, an improved support method was proposed, which includes optimal bolt parameters and arrangement, floor beam layout by grooving, and full length grouting. Based on the modeling results by FLAC3D, the new support method is much better than the current one in terms of preventing the large deformation of surrounding rock and restricting the development of plastic zones. For implementation and verification, field experiments, along with deformation monitoring, were conducted in the 958 level roadway of Mining II areas. The results show that the improved support can significantly reduce surrounding rock deformation, avoid frequent repair, and maintain the long-term stability of the roadway. Compared to the original support, the new support method can greatly save investment of mines, and has good application value and popularization value. 展开更多
关键词 deep roadway floor heave high stress support steel beam
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深井巷道滑移底鼓机理与钢管混凝土桩治理底鼓技术研究 被引量:1
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作者 冯利宁 丁斌 +3 位作者 孙利辉 张海洋 杨江华 王中海 《煤炭工程》 北大核心 2023年第4期58-64,共7页
深井巷道底鼓现象十分普遍,其中滑移型底鼓治理难度大。以羊东矿-850水平北翼轨道大巷为背景,研究了轨道大巷强烈大变形规律,分析了巷道底板滑移破坏机理,提出巷道底板钢管混凝土桩抗滑抑制底鼓技术,并利用数值模拟方法分析了不同支护... 深井巷道底鼓现象十分普遍,其中滑移型底鼓治理难度大。以羊东矿-850水平北翼轨道大巷为背景,研究了轨道大巷强烈大变形规律,分析了巷道底板滑移破坏机理,提出巷道底板钢管混凝土桩抗滑抑制底鼓技术,并利用数值模拟方法分析了不同支护密度下抗滑桩控制底鼓效果。结果表明:高应力场环境、岩石黏土矿物含量高、裂隙水与工程积水,是导致岩石崩解破坏、巷道围岩大变形及强烈底鼓的主要因素;控制底板岩层滑移面形成及增加滑移面抗剪切强度是抑制滑移型底鼓的关键;钢管混凝土桩兼具抑制滑移面形成和提高滑移面部位强度的作用;随着抗滑桩布置密度的增加,巷道底鼓量与巷道底板破坏深度随之减小,在一定支护密度下巷道底板破坏深度趋于稳定;抗滑桩由外至里受力呈拱形分布,桩支护密度大时桩受力小,巷道底板中部或里侧桩受力大于两侧桩。现场试验表明:巷道底鼓得到了有效控制,能够满足生产运输的正常使用。 展开更多
关键词 深井巷道 高应力场 滑移型底鼓 钢管混凝土桩 抗滑移
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