复合顶板动压巷道锚索失效机理及合理预应力研究
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摘要
受强烈动压影响的复合顶板巷道锚索经常会发生大面积支护失效,致使此类巷道在使用过程中需多次维修,成本高,影响安全。文章分析了锚索失效的机理,指出动压影响复合顶板锚索施工过程中预紧力不足是导致锚索支护失效的主要原因。并通过数值模拟和试验研究了导致锚索支护失效的关键影响因素,提出了合理的锚索长度应该在4~6m。现场试验证明,合理的锚索预紧力不仅可以缩短锚索长度,而且可以显著改善巷道的支护效果。
The rock cables fail in large area in dynamic pressure roadway with compound roof,calling for repeated repair,which is unfavorable for cost and safety. The paper analyzed the rock cable failure mechanism,and pointed out that the main reason for rock cable failure was inadequate cable preload applied. The key factors for rock cable failure were studied through numerical simulation and laboratory tests,and the reasonable length of rock cable was 4 ~ 6m. The field tests showed that,reasonable rock cable preload could shorten rock cable length,while significantly improve the supporting effect of roadway.
The rock cables fail in large area in dynamic pressure roadway with compound roof,calling for repeated repair,which is unfavorable for cost and safety. The paper analyzed the rock cable failure mechanism,and pointed out that the main reason for rock cable failure was inadequate cable preload applied. The key factors for rock cable failure were studied through numerical simulation and laboratory tests,and the reasonable length of rock cable was 4 ~ 6m. The field tests showed that,reasonable rock cable preload could shorten rock cable length,while significantly improve the supporting effect of roadway.
引文
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[2]高明仕,郭春生,李江锋,等.厚层松软复合顶板煤层梯次支护力学原理及应用[J].中国矿业大学学报,2011,40(3):333-338.
[3]杜波,谢生荣,何富连,等.厚层炭质泥岩顶板煤巷复合主动支护系统研究[J].煤炭科学技术,2009,37(2):13-16.
[4]康红普,王金华.煤巷锚杆支护理论与成套技术[M].北京:煤炭工业出版社,2007.
[5]康红普,林健,吴拥政.全断面高预应力强力锚索支护技术及其在动压巷道中的应用[J].煤炭学报,2009,34(9):1153-1159.
[6]林健,康红普.煤矿锚索预紧应力损失原因分析及解决途径[J].煤矿开采,2008,13(6):6-8.
[7]马长乐,吴拥政,何杰,等.预应力损失对高预应力全锚索支护技术的影响[J].煤矿开采,2012,17(2):61-63.
[8]康红普,吴拥政,褚晓威,等.小孔径锚索预应力损失影响因素的试验研究[J].煤炭学报,2011,36(8):1245-1251.
[9]褚晓威.小孔径预应力锚索预应力损失机理及试验研究[D].北京:煤炭科学研究总院,2010.
[10]余开彪,程凯兵,杨明亮.预应力锚索预应力损失研究[J].岩土力学,2006,26(增刊):159-162.
[11]朱晗迓,尚岳全,陆锡铭,等.锚索预应力长期损失与坡体蠕变耦合分析[J].岩土工程学报,2005,27(4):464-467.
[12]陈安敏,顾金才,沈俊,等.软岩加固中锚索张拉吨位随时间变化规律的模型试验研究[J].岩石力学与工程学报,2002,21(2):251-256.
[13]范卫琴.锚索预应力损失规律的数值模拟[D].武汉:武汉理工大学,2007.
[14]叶惠飞.锚索预应力损失变化规律分析[D].浙江:浙江大学,2004.
[15]李英勇,王梦恕,张顶立,等.锚索预应力变化影响因素及模型研究[J].岩石力学与工程学报,2008,27(增1):3140-3146.