基于锚杆加固作用的圆形巷道围岩弹塑性分析
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摘要
为研究锚杆支护机理及控制巷道围岩稳定,基于锚杆加固效应,将锚杆的支承作用考虑成作用于锚固区围岩的体积力,将锚杆的加固作用视为增强了锚固区围岩的强度参数;建立巷道计算模型,并进行弹塑性分析,导出了巷道围岩应力、位移解析解。结合算例,将理论计算值与实际监测值进行了对比,比较了锚杆支护与未支护时围岩应力,同时进行了围岩变形的影响参数分析。结果表明:锚杆支护改善了塑性区围岩应力状态,提高了围岩自承载能力;锚杆长度、间排距的参数设计遵循"长而疏、短而密"原则。文中理论解析解考虑了锚杆加固效应,为认识锚杆支护机理提供了理论参考,也能为巷道围岩控制提供合理的锚杆支护方案。
To study the mechanism of bolt support and control the stability of roadway surrounding rock,firstly,based on the bolt reinforcement effect,the support effect of the bolt is considered as the volume force acting on the surrounding rock of the anchorage zone,and the reinforcement effect of the anchor is regarded as enhancing the strength parameters of the surrounding rock of the anchorage zone. Then,the roadway calculation model is established,and the elastic-plastic analysis is carried out,and the analytical solution of the surrounding rock stress and displacement of the roadway is derived. Finally,combined with the example,the calculated value is compared with the measured value,and the surrounding rock stresses of bolt support and unsupported are compared,meanwhile the influence parameters of surrounding rock deformation are analyzed. The results show that the bolt support improves the stress state of the surrounding rock in the plastic zone and improves the self-bearing capacity of the surrounding rock; The parameter design of bolt length and spacing follows the principle of "Long and thin,Short and thick". The analytical solution of the theory considers the blot reinforcement effect,provides a theoretical reference for understanding the bolt support mechanism,and can also provide a reasonable bolt support scheme for the surrounding rock control of the roadway.
To study the mechanism of bolt support and control the stability of roadway surrounding rock,firstly,based on the bolt reinforcement effect,the support effect of the bolt is considered as the volume force acting on the surrounding rock of the anchorage zone,and the reinforcement effect of the anchor is regarded as enhancing the strength parameters of the surrounding rock of the anchorage zone. Then,the roadway calculation model is established,and the elastic-plastic analysis is carried out,and the analytical solution of the surrounding rock stress and displacement of the roadway is derived. Finally,combined with the example,the calculated value is compared with the measured value,and the surrounding rock stresses of bolt support and unsupported are compared,meanwhile the influence parameters of surrounding rock deformation are analyzed. The results show that the bolt support improves the stress state of the surrounding rock in the plastic zone and improves the self-bearing capacity of the surrounding rock; The parameter design of bolt length and spacing follows the principle of "Long and thin,Short and thick". The analytical solution of the theory considers the blot reinforcement effect,provides a theoretical reference for understanding the bolt support mechanism,and can also provide a reasonable bolt support scheme for the surrounding rock control of the roadway.
引文
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[13]周浩,肖明,陈俊涛.大型地下洞室全长黏结式岩石锚杆锚固机制研究及锚固效应分析[J].岩土力学,2016,37(5):1503-1511.
[14]文竞舟,张永兴,王成.隧道围岩全长黏结式锚杆界面力学模型研究[J].岩土力学,2013,34(6):1645-1651.
[15]汤伯森.弹塑性围岩砂浆锚杆支护问题的估算法[J].岩土工程学报,1991,13(6):42-51.
[16]韦四江,勾攀峰.锚杆预紧力对锚固体强度强化的模拟实验研究[J].煤炭学报,2012,37(12):1987-1993.
[2]孙河川,张鏖,施仲衡.喷锚支护与隧道自承拱的机理[J].岩土工程学报,2004,26(4):490-494.
[3]康红普,王金华,林健.煤矿巷道支护技术的研究与应用[J].煤炭学报,2010,35(11):1809-1814.
[4]张钦祥.保德矿采动巷道围岩分次控制方法及关键支护技术[D].北京:中国矿业大学(北京),2013.
[5]王正义,窦林名,王桂峰.动载作用下圆形巷道锚杆支护结构破坏机理研究[J].岩土工程学报,2015,37(10):1901-1909.
[6]何满潮.深部软岩工程的研究进展与挑战[J].煤炭学报,2014,39(8):1409-1417.
[7]晏勤,李树忱,谢璨,等.锚杆加固作用下圆形隧道复合岩体围岩特征曲线解析方法研究[J].岩石力学与工程学报,2017,36(12):3021-3027.
[8]李大伟,侯朝炯.巷道锚杆支护特性分析与应用[J].Journal of China Coal Society,2008,33(6):613-618.
[9]SebastianoPelizza,Sang-Hwan Kim,Jong-Soo Kim.A study of strength parameters in the reinforced ground by rock bolts[C].Seoul:Proceedings of the World Tunnel Congress and 32nd ITAAssembly,2006.
[10]杨双锁,张百胜.锚杆对岩土体作用的力学本质[J].岩土力学,2003,24(10):279-282.
[11]孟强,赵洪波,茹忠亮,等.锚杆支护圆形隧洞弹塑性解[J].工程力学,2015,32(7):17-25.
[12]常聚才,谢广祥.锚杆支护控制深部巷道围岩力学效应研究[J].水文地质工程地质,2013,40(6):43-48.
[13]周浩,肖明,陈俊涛.大型地下洞室全长黏结式岩石锚杆锚固机制研究及锚固效应分析[J].岩土力学,2016,37(5):1503-1511.
[14]文竞舟,张永兴,王成.隧道围岩全长黏结式锚杆界面力学模型研究[J].岩土力学,2013,34(6):1645-1651.
[15]汤伯森.弹塑性围岩砂浆锚杆支护问题的估算法[J].岩土工程学报,1991,13(6):42-51.
[16]韦四江,勾攀峰.锚杆预紧力对锚固体强度强化的模拟实验研究[J].煤炭学报,2012,37(12):1987-1993.