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隧道建设(中英文) ›› 2022, Vol. 42 ›› Issue (S1): 321-330.DOI: 10.3973/j.issn.2096-4498.2022.S1.037

• 研究与探索 • 上一篇    下一篇

深埋高地应力水工隧洞地应力特征及岩爆脆性破坏深度预测研究

周亚萍, 姜海波*   

  1. (石河子大学水利建筑工程学院, 新疆 石河子 832000) 
  • 出版日期:2022-07-22 发布日期:2022-08-23
  • 作者简介:周亚萍(1996—),女,河南信阳人,石河子大学水利工程专业在读硕士,研究方向为寒旱区水工结构。Email: 1162531781@qq.com。 *通信作者: 姜海波, Email: klaud_123@163.com。

Research on InSitu Stress Characteristics of DeepBuried HighInSitu Hydraulic Tunnel and Prediction of Rockburst Brittle Failure Depth

ZHOU Yaping, JIANG Haibo*   

  1. (College of Water and Architectural Engineering, Shihezi University, Shihezi 832000, Xinjiang, China)
  • Online:2022-07-22 Published:2022-08-23

摘要: 为解决高地应力情况下水工隧洞开挖时产生的岩爆问题,以新疆某高埋深水工隧洞为依托,并结合现场水压致裂法和钻孔套芯解除法测试获得的地应力数据。研究深埋引水隧洞区域地应力场分布规律,通过强度理论判断岩爆发生的可能性;在考虑高地应力与围岩开挖二次应力状态作用前提下,通过岩爆破坏区深度理论公式,结合现场数据计算出岩爆破坏深度。结果表明: 1)隧洞处平均初始地应力应力基本在23 MPa左右,最大水平主应力为28.6 MPa,属于高地应力隧洞; 2)三向主应力间的总体关系为σH(最大水平应力)>σZ(自重应力)>σh(最小水平应力),属于σHZ(走滑型)初始地应力场,以水平构造应力为主导; 3)隧洞最大主应力与最小主应力之间差值较大,依据摩尔-库仑准则,表明该隧洞开挖的临空面会存在较大的剪应力,易引起隧洞发生岩爆; 4)在隧洞开挖过程中,隧洞将会发生中—强等级的岩爆,发生岩爆脆性破坏最大深度为0.68 m

关键词: 深埋水工隧洞, 高地应力, 地应力测量, 岩爆, 脆性破坏深度

Abstract: In order to solve the rockburst problem caused by hydraulic tunnel excavation under the condition of high insitu stress, a deepburied hydraulic tunnel in Xinjiang is taken as example, and the insitu stress data from the tests are obtained combined the onsite hydraulic fracturing method and the drilling sleeve core removal method. Firstthe distribution laws of the insitu stress field in the deepburied hydraulic tunnel area are studied, and the possibility of rockburst occurence is judged through strength theory. Then, considering the effects of high insitu stress and the secondary stress state of surrounding rock excavation, the damage depth of the rockburst is calculated through the theoretical formula of the depth of rockburst failure zone. The results show that: 1The average initial insitu stress at the tunnel is basically around 23 MPa, and the maximum horizontal principal stress is 28.6 MPa, which belongs to the high insitu stress tunnel. 2The overall relationship among the threedimensional principal stresses is WT5《TNR#I》〗σ〖WT5《TNR》〗H>WT5《TNR#I》〗σ〖WT5《TNR》〗Z>WT5《TNR#I》〗σ〖WT5《TNR》〗h, which belongs to the WT5《TNR#I》〗σ〖WT5《TNR》〗HZtype initial insitu stress field, and the horizontal tectonic stress is dominant. (3) The differential value between the maximum and the minimum principal stresses of the tunnel is large, and according to the MohrCoulomb criterion, it shows that the tunnel excavation will have a large shear stress on the free surface and easy to cause rockburst in tunnel. (4) During tunnel excavation, medium to strong rockburst will be occccrred in the tunnel, and the maximum depth of rockburst brittle failure is 0.68 m.

Key words: deepburied hydraulic tunnel, high insitu stress, insitu stress measurement; rockburst, brittle failure depth