|
|
|
| STUDY OF STRENGTH THEORY AND APPLICATION OF OVERLAP ARCH BEARING BODY FOR DEEP SOFT SURROUNDING ROCK |
| (1. Hunan Provincial Key Laboratory of Safe Mining Techniques of Coal Mines，Hunan University of Science and Technology，Xiangtan，Hunan 411201，China；2. School of Energy and Safety Engineering，Hunan University of Science and Technology，Xiangtan，Hunan 411201，China；3. Civil and Environment Engineering School，University of Science and Technology Beijing， Beijing 100083，China) |
|
|
|
|
Abstract At present，the combined support method of long anchor cable and bolt shotcrete mesh is widely used in deep soft surrounding rock，but it is very deficient in understanding on bearing behavior of the combined supporting structure；and it still lacks quantitative analytical formulae especially for bearing capacities of primary supporting and secondary supporting. In allusion to the united supporting characteristics of anchor，spray net and cable of deep wall rock，the mechanical model of overlap arch bearing body were put forward based on rock mechanics theory，which are composed with the main compression arch(bolt supporting) and the secondary compression arch(intensive cable supporting). By means of elastoplastic theory，neutral point theory of bolt and force transferring mechanism of cable，strength equations of the bearing body of primary supporting and second supporting were deduced. Community composed of wall rock and supporting structure is regarded as an equivalent coupling surrounding rock；and relation equations of rock mechanics parameters of surrounding rock with release displacements(yield displacements) were obtained from the method of elastoplastic mechanics. Computational results of engineering indicate that the peak intensity and bearing capability of rock mass were enhanced obviously for the breaking cavity of Jinchuan Mine III after the support of overlap arch；the limit bearing capacity of equivalent coupling surrounding rock can reach 513.34 kN；the value of can reach 47.54º and the value of can reach 1.37 MPa. Monitoring data also show that deformations of surrounding rock supported by overlap arch bearing body trend to be stable，convergence rate of which is less than 0.1 mm/d.
|
|
Received: 15 January 2010
|
|
|
|
| [1] 侯朝炯，郭励生，勾攀峰. 煤巷锚杆支护[M]. 徐州：中国矿业大学出版社，1999：14–25.(HOU Chaojiong，GUO Lisheng，GOU Panfeng. Bolt supporting of coal roadway[M]. Xuzhou：China University of Mining and Technology Press，1999：14–25.(in Chinese))
[2] 余伟健. 高地应力构造带工程围岩支护设计及稳定性研究[博士学位论文][D]. 北京：北京科技大学，2009：106–107.(YU Weijian. Supporting design and stability study of surrounding rock within high grostress tectonic zone[Ph. D. Thesis][D]. Beijing：University of Science and Technology Beijing，2009：106–107.(in Chinese))
[3] 戴兰芳，梁旭黎，李文秀. 巷道围岩与支护相互作用分析[J]. 矿山压力与顶板管理，2005，22(3)：33–35.(DAI Lanfang，LIANG Xuli，LI Wenxiu. Analysis of interaction between tunnel surrounding rock and supporting structure in mining area[J]. Ground Pressure and Strata Control，2005，22(3)：33–35.(in Chinese))
[4] 侯公羽. 围岩–支护作用机制评述及其流变变形机制概念模型的建立与分析[J]. 岩石力学与工程学报，2008，27(增2)：3 618–3 629. (HOU Gongyu. Review of interaction mechanism between surrounding rock and the analysis of conceptual model of rheological deformation mechanism[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(Supp.2)：3 618–3 629.(in Chinese))
[5] 靳晓光，李晓红，杨春和，等. 深埋隧道围岩–支护结构稳定性研究[J]. 岩土力学，2005，26(9)：1 473–1 476.(JIN Xiaoguang，LI Xiaohong，YANG Chunhe，et al. Stability of surrounding rock- supports structure of deep buried tunnel[J]. Rock and Soil Mechanics，2005，26(9)：1 473–1 476.(in Chinese))
[6] 刘保国，杜学东. 圆形洞室围岩与结构相互作用的黏弹性解析[J]. 岩石力学与工程学报，2004，23(4)：561–564.(LIU Baoguo，DU Xuedong. Visco-elastical analysis on interaction between supporting structure and surrounding rocks of circle tunnel[J]. Chinese Journal of Rock Mechanics and Engineering，2004，23(4)：561–564.(in Chinese))
[7] 柏建彪，王卫军，侯朝炯，等. 综放沿空掘巷围岩控制机制及支护技术研究[J]. 煤炭学报，2000，25(5)：478–481.(BAI Jianbiao，WANG Weijun，HOU Chaojiong，et al. Control mechanism and support technique about gateway driven along goaf in fully mechanized top coal caving face[J]. Journal of China Coal Society，2000，25(5)：478–481.(in Chinese))
[8] 孙晓明，何满潮，杨晓杰. 深部软岩巷道锚网索耦合支护非线性设计方法研究[J]. 岩土力学，2006，27(7)：1 061–1 065.(SUN Xiaoming，HE Manchao，YANG Xiaojie. Research on nonlinear mechanics design method of bolt-net-anchor coupling support for deep soft rock tunnel[J]. Rock and Soil Mechanics，2006，27(7)：1 061– 1 065.(in Chinese))
[9] 余伟健，高 谦，张周平，等. 深埋大跨度软岩硐室让压支护设计研究[J]. 岩土工程学报，2009，31(1)：40–47.(YU Weijian，GAO Qian，ZHANG Zhouping，et al. Yield supporting design for deep and large-span soft rock caverns[J]. Chinese Journal of Geotechnical Engineering，2009，31(1)：40–47.(in Chinese))
[10] 孙晓明，杨 军，曹伍富. 深部回采巷道锚网索耦合支护时空作用规律研究[J]. 岩石力学与工程学报，2007，26(5)：895–900.(SUN Xiaoming，YANG Jun，CAO Wufu. Research on space-time action rule of bolt-net-anchor coupling support for deep gateway[J]. Chinese Journal of Rock Mechanics and Engineering，2007，26(5)：895–900.(in Chinese))
[11] 徐金海，石炳华，王云海. 锚固体强度与组合拱承载能力的研究与应用[J]. 中国矿业大学学报，1999，28(5)：481–483.(XU Jinhai，SHI Binghua，WANG Yunhai. Research on strength of reinforced unit and bearing capability of broken rock arch and its application[J]. Journal of China University of Mining and Technology，1999，28(5)：481–483.(in Chinese))
[12] 王明恕. 全长锚固锚杆机制的探讨[J]. 煤炭学报，1983，8(1)：40–47.(WANG Mingshu. Mechanism of full-column rock bolt[J]. Journal of China Coal Society，1983，8(1)：40–47.(in Chinese))
[13] 高 谦，任天贵. 带垫板全长锚杆和加钢筋条带的锚喷支护理论分析研究[J]. 煤炭学报，1994，19(5)：550–556.(GAO Qian，REN Tiangui. Theoretical analysis of rock-bolting and shotcreting using bolts with bottom plate and steel reinforced strip[J]. Journal of China Coal Society，1994，19(5)：550–556.(in Chinese))
[14] 高永涛，吴顺川，孙金海. 预应力锚杆锚固段应力分布规律及应用[J]. 北京科技大学学报，2002，24(4)：387–390.(GAO Yongtao，WU Shunchuan，SUN Jinhai. Application of the prestress bolt stress distributing principle[J]. Journal of University of Science and Technology Beijing，2002，24(4)：387–390.(in Chinese))
[15] 薛顺勋，聂光国，姜光杰，等. 软岩巷道支护技术指南[M]. 北京：煤炭工业出版社，2002：88–91.(XUE Shunxun，NIE Guangguo，JIANG Guangjie，et al. Technical manual for supporting the soft rock tunnel[M]. Beijing：China Coal Industry Publishing House，2002：88–91.(in Chinese))
[16] 金川公司技术中心技术情报室. 锚杆支护实用手册[M]. 金昌：[s. n.]，1994：21–29.(Information Office of Technology Center，Jinchuan Group Co.. Practicality manual of bolt supporting[M]. Jinchang：[s. n.]，1994：21–29.(in Chinese)) |
|
|
|
2010, Vol. 29 
