ISSN 2096-4498
CN 44-1745/U
Tunnel Construction ›› 2022, Vol. 42 ›› Issue (S1): 321-330.DOI: 10.3973/j.issn.2096-4498.2022.S1.037
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ZHOU Yaping, JIANG Haibo*
Online:
Published:
Abstract: In order to solve the rockburst problem caused by hydraulic tunnel excavation under the condition of high insitu 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. First,the 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: (1)The 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. (2)The 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》〗HZtype 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: deepburied hydraulic tunnel, high insitu stress, insitu stress measurement; rockburst, brittle failure depth
ZHOU Yaping, JIANG Haibo. Research on InSitu Stress Characteristics of DeepBuried HighInSitu Hydraulic Tunnel and Prediction of Rockburst Brittle Failure Depth[J]. Tunnel Construction, 2022, 42(S1): 321-330.
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URL: http://www.suidaojs.com/EN/10.3973/j.issn.2096-4498.2022.S1.037
http://www.suidaojs.com/EN/Y2022/V42/IS1/321