开挖扰动下高应力岩体的能量演化与应力重分布规律研究

邹洋; 李夕兵; 周子龙; 尹土兵; 殷志强

开挖扰动下高应力岩体的能量演化与应力重分布规律研究 English Version

邹洋^1,2,
李夕兵^1,2,
周子龙^1,2,
尹土兵^1,2,
殷志强³

1. 中南大学资源与安全工程学院，湖南长沙 410083；2. 深部金属矿产开发与灾害控制湖南省重点实验室，湖南长沙 410083；3. 安徽理工大学能源与安全学院，安徽淮南 232001

详细信息

作者简介:
邹洋(1986– )，男，湖北荆州人，博士研究生，从事采矿与岩石动力学研究。

中图分类号: TU45
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出版历程
- 收稿日期: 2011-07-21
- 发布日期: 2012-10-09

Energy evolution and stress redistribution of high-stress rock mass under excavation distribution

1. School of Resources and Safety Engineering, Central South University, Changsha 410083, China; 2. Hunan Key Laboratory of Resources Exploitation and Hazard Control for Deep Metal Mines, Changsha 410083, China; 3. School of Mineral and Safety, Anhui University of Science and Technology, Huainan 232001, China

摘要

摘要: 为揭示深部灾害发生机理，探讨各因素对开挖扰动效应的影响机制，利用离散元PFC软件建立不同原岩应力状态及不同开挖断面下的开挖模型。通过显式计算得到不同情形下高应力岩体在开挖扰动中的动能释放曲线，并以曲线峰值及最终稳定值，分别作为评判开挖扰动程度及开挖系统稳定性的能量指标，利用该组指标分析表明在原岩应力接近静水压力状态、采用圆形断面开挖时扰动效应最小；通过进一步分析，得到不同开挖断面及不同原岩应力状态下高应力岩体应力重分布的一般规律，并以开挖卸载的角度重视应力重分布这一过程，最终揭示了原岩应力状态及开挖断面几何形态对应力重分布的影响机制。
- 深部开挖 /
- 能量演化 /
- 应力重分布
Abstract: In order to reveal the mechanism of the occurrence of deep engineering catastrophe and the influence of various factors on excavation perturbing effect, the models with different original stress states and different excavation sections are established by using the distinct element numerical simulation software PFC. Through explicit calculation, the kinetic release curves of high-stress rock mass under various circumstances are gained, and the peak and final stable values of the obtained curves are regarded as energy indices, which are used for representing the disturbance intensity and the stability degree of the excavation system respectively. The analysis based on these indices shows that the excavation with a circular cross section will induce the minimum disturbance effect under a nearly hydrostatic pressure stress state. The stress redistribution characteristics of high original stress rock mass excavated by different sections are also studied. Through the inspection of stress redistribution course which is regarded as an unloading process, the influence mechanisms of the original rock mass stress state and the geometry of excavation section on the stress redistribution are revealed ultimately.
- deep excavation /
- energy evolution /
- stress redistribution

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参考文献(22)

[1]	LI T, CAI M F, CAI M. A review of mining-induced seismicity in China[J]. International Journal of Rock Mechanics and Mining Sciences, 2007, 44(8): 1149–1171.
[2]	HE M C, NIE W, HAN L Q, et al. Microcrack analysis of Sanya grantite fragments from rockburst tests[J]. Mining Science and Technology (China), 2010, 20(2): 238–243.
[3]	CHEN Z H, TANG C A, HUANG R Q. A double rock sample model for rockbursts[J]. International Journal of Rock Mechanics and Mining Sciences, 1997, 34(6): 991–1000.
[4]	ZHAO Yi-xin, JIANG Y D, ZHU J, et al. Investigation on the precursors of bump-prone coal failure[J]. Procedia Earth and Planetary Science, 2009, 1(1): 530–535.
[5]	B?KBLOM G, MARTIN C D. Recent experiments in hard rocks to study the excavation response: Implications for the performance of a nuclear waste geological repository[J]. Tunnelling and Underground Space Technology, 1999, 14(3): 377–394.
[6]	MARTIN C D, KAISER P K, CHRISTIANSSON R. Stress, instability and design of underground excavations[J]. International Journal of Rock Mechanics and Mining Sciences, 2003, 40(7/8): 1027–1047.
[7]	FAKHIMI A, CARVALHO F, ISHIDA T, et al. Simulation of failure around a circular opening in rock[J]. International Journal of Rock Mechanics and Mining Sciences, 2002, 39(4): 507–515.
[8]	ZHU W C, LIU J, TANG C A, et al. Simulation of progressive fracturing processes around underground excavations under biaxial compression[J]. Tunnelling and Underground Space Technology, 2005, 20(3): 231–247.
[9]	GOLSHANI A, ODA M, OKUI Y, et al. Numerical simulation of the excavation damaged zone around an opening in brittle rock[J]. International Journal of Rock Mechanics and Mining Sciences, 2007, 44(6): 835–845.
[10]	WANG J A, PARK H D. Comprehensive prediction of rockburst based on analysis of strain energy in rocks[J]. Tunnelling and Underground Space Technology, 2001, 16(1): 49–57.
[11]	ZHAO Y X, JIANG Y D. Acoustic emission and thermal infrared precursors associated with bump-prone coal failure[J]. International Journal of Coal Geology, 2010, 83(1): 11–20.
[12]	SHIOTANI T. Evaluation of long-term stability for rock slope by means of acoustic emission technique[J]. NDT & E International, 2007, 39(3): 217–228.
[13]	HAJIABDOLMAJID V, KAISER P. Brittleness of rock and stability assessment in hard rock tunneling[J]. Tunnelling and Underground Space Technology, 2003, 18(1): 35–48.
[14]	CAI M. Influence of stress path on tunnel excavation response-numerical tool selection and modeling strategy[J]. Tunnelling and Underground Space Technology, 2008, 23(6): 618–628.
[15]	GABET T, MAL?OT Y, DAUDEVILLE L. Triaxial behaviour of concrete under high stresses: Influence of the loading path on compaction and limit states[J]. Cement and Concrete Research, 2008, 38(3): 403–412.
[16]	徐芝纶. 弹性力学简明教程[M]. 北京：高等教育出版社, 2006. (XU Zhi-lun. Elastic mechanics brief tutorial[M]. Beijing: Higher Education Press, 2006. (in Chinese))
[17]	READ R S. 20 years of excavation response studies at AECL'S underground research laboratory[J]. International Journal of Rock Mechanics and Mining Sciences, 2004, 41(8): 1251–1275.
[18]	POTYONDY D O, CUNDALL P A. A bonded-particle model for rock[J]. International Journal of Rock Mechanics and Mining Sciences, 2004, 41(8): 1329–1364.
[19]	周健, 张刚, 曾庆有. 主动侧向受荷桩模型试验与颗粒流数值模拟研究[J]. 岩土工程学报, 2007, 29(5): 650–656. (ZHOU Jian, ZHANG Gang, ZENG Qing-you. Model tests and PFC2D numerical analysis of active laterally loaded piles[J]. Chinese Journal of Geotechnical Engineering, 2007, 29(5): 650–656. (in Chinese))
[20]	REN G, SMITH J V, TANGET J W, et al. Underground excavation shape optimization using an evolutionary procedure[J]. Computers and Geotechnics, 2005, 32(2): 122–132.
[21]	王文星. 岩体力学[M]. 长沙: 中南大学出版社, 2004. (WANG Wen-xing. Rock mechanics[M]. Changsha: Central South University Press, 2004. (in Chinese))
[22]	MARTIN C D, READ R S, MARTINO J B, et al. Observations of brittle failure around a circular test tunnel[J]. International Journal of Rock Mechanics and Mining Sciences, 1997, 34(7): 1065–1073.