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

XIAO Ya-xun   FENG Xia-ting   CHEN Bing-rui   FENG Guang-liang   ZHANG Zhao-tai   MING Hua-jun

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

更新时间：2026-06-25

- Rockburst risk of tunnel boring machine part-pilot excavation in very strong rockburst section of deep hard tunnel
- Vol. 32, Issue 10, (2011)
- 作者机构：
  
  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
- 作者简介：
- 基金信息：
- DOI：
  CLC： O319.56
- Online First：13 October 2011，
  
  Published：2011
- 稿件说明：
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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).
DOI：

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). DOI：

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。

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.

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