深埋隧洞极强岩爆段隧道掘进机半导洞掘进岩爆风险研究

›› 2011, Vol. 32 ›› Issue (10): 3111-3118.

深埋隧洞极强岩爆段隧道掘进机半导洞掘进岩爆风险研究

肖亚勋¹，冯夏庭¹，陈炳瑞¹，丰光亮¹，张照太²，明华军¹

1.中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室，武汉 430071；2.北京振冲工程股份有限公司，北京 100024

收稿日期:2010-04-22 出版日期:2011-10-10 发布日期:2011-10-13
作者简介:肖亚勋，男，1985年生，博士研究生，主要从事深部地下岩土工程围岩稳定性监测、分析及控制方面的研究工作
基金资助:
国家973项目资助（No. 2010CB732006）；国家自然科学基金项目资助（No. 50909092）；湖北省自然科学基金项目资助（No. 2009CDB120）

Rockburst risk of tunnel boring machine part-pilot excavation in very strong rockburst section of deep hard tunnel

XIAO Ya-xun¹, FENG Xia-ting¹, CHEN Bing-rui¹, FENG Guang-liang¹, ZHANG Zhao-tai², MING Hua-jun¹

1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; 2. Beijing Vibroflotation Engineering Co. Ltd., Beijing 100024, China

Received:2010-04-22 Online:2011-10-10 Published:2011-10-13

摘要/Abstract

摘要： 深埋隧洞TBM（隧道掘进机）全断面掘进时，在局部超高应力集中的完整硬脆性岩体洞段将直面极强岩爆的风险，设备和人员的安全将遭受极大的威胁。在锦屏II水电站3#引水隧洞极强岩爆段实施了“先半导洞+TBM联合掘进”实验，结合微震实时监测信息对TBM半导洞掘进的岩爆风险开展了研究。监测结果表明，（1）TBM半导洞掘进期间，日平均微震事件数、日平均辐射微震能、微震大事件数及实际岩爆发生次数和强度均远远低于TBM全断面掘进；（2）能量指数对数值和累积视体积的时域演化表明，TBM半导洞掘进强烈岩爆发生的风险远低于TBM全断面掘进，现场实际开挖也证明了这一点；（3）半导洞洞段微震事件的空间集结程度、总数、震级大小与能量辐射均远小于全断面洞段。因此，TBM半导洞掘进的岩爆风险远远低于TBM全断面掘进，在具有施工条件的情况下采用先半导洞预处理，然后TBM半断面掘进极强岩爆段，以期控制岩爆风险的方案是可行的。

关键词: 深埋隧洞, 隧道掘进机（TBM）, 半导洞, 极强岩爆, 微震监测, 锦屏II水电站

Abstract: Tunnel boring machine(TBM) should face the risk of very strong rockburst directly in intact and brittle rock mass section with ultrahigh stress concentration for full-face excavation in deep tunnel; then safety of equipment and personnel will be under great threat. The excavation test through “part-pilot heading + TBM” is carried out in the diversion tunnel #3 of the Jinping II hydropower station and the rockburst risk of TBM part-pilot excavation is researched via real-time microsesimic monitoring. The results show that: (1) The daily number of microseismic events, the daily accumulative radiated seismic energy, number of big events and frequency and strength of rockburst in the field during part-pilot excavation are far lower than in the period of full-face advance. (2) The time domain evolution of logarithm of energy index and accumulative apparent volume indicates that the risk of strong rockburst in part-pilot section is smaller; and the excavation in field also proved this. (3) In comparison to full-face advance, the degree of concentration, number, magnitude and radiated energy of microseismic events in space in section of part-pilot are far lower. Therefore, the rockburst risk of TBM for part-pilot driving is more less than for full-face advance. In very strong rockburst section, when construction condition is indispensable, the part-pilot can be excavated in advance and then TBM pass, the risk of rockburst can be controlled availably.

Key words: deep tunnel, tunnel boring machine, part-pilot, very strong rockburst, microseismic monitoring, Jinping II hydropower station

中图分类号:

O 319.56

肖亚勋冯夏庭陈炳瑞丰光亮张照太明华军. 深埋隧洞极强岩爆段隧道掘进机半导洞掘进岩爆风险研究[J]. , 2011, 32(10): 3111-3118.

XIAO Ya-xun FENG Xia-ting CHEN Bing-rui FENG Guang-liang ZHANG Zhao-tai MING Hua-jun. Rockburst risk of tunnel boring machine part-pilot excavation in very strong rockburst section of deep hard tunnel[J]. , 2011, 32(10): 3111-3118.

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