Volume 28 Issue 2
Apr.  2022
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LI Bin, ZHANG Wen, WEN Ran, 2022. Study on the hydraulic fracturing in-situ stress measurement in super-long highway tunnels in southern Shaanxi:Engineering geological significance. Journal of Geomechanics, 28 (2): 191-202. DOI: 10.12090/j.issn.1006-6616.2021053
Citation: LI Bin, ZHANG Wen, WEN Ran, 2022. Study on the hydraulic fracturing in-situ stress measurement in super-long highway tunnels in southern Shaanxi:Engineering geological significance. Journal of Geomechanics, 28 (2): 191-202. DOI: 10.12090/j.issn.1006-6616.2021053

Study on the hydraulic fracturing in-situ stress measurement in super-long highway tunnels in southern Shaanxi:Engineering geological significance

doi: 10.12090/j.issn.1006-6616.2021053
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This research is financially supported by the National Natural Science Foundation of China (Grant No.51468055)

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  • Received: 2021-05-26
  • Revised: 2021-12-20
  • The complex terrain and marked anisotropy of regional tectonic stress field in western China make the crustal stress state an important assessment parameter. Understanding the regional crustal stress state lays the foundation for assessing the layout at the tunnel design stage and predicting rockburst, fault slip and other engineering disasters in the tunnel construction process. This study aims to explore the current in-situ stress state of the super-long highway tunnels in southern Shaanxi. We did hydraulic fracturing in-situ stress measurement of the Boreholes ZK10 and ZK11 in the Guxiandong tunnel and the Hualongshan tunnel, respectively, and thus characterized the current in-situ stress distribution of the two tunnels. The measurement results show that:The SH values at the maximum buried depths of the Guxiandong and Hualongshan super-long deep tunnels are 13 MPa and 22 MPa, respectively. The stress relations of the Guxiandong and Hualongshan tunnels are SH>Sh>Sv and SH>Sv>Sh, respectively, and horizontal principal stress plays a leading role. The SH direction is NW-NWW, which is basically consistent with the direction of the maximum principal stress in the basic database of crustal stress environment in mainland China. Three conclusions were drawn from the results of in-situ stress measurement in combination with related theories and assessment criteria. Firstly, the angle between the direction of maximum horizontal principal stress and tunnel axis is beneficial to the stability of tunnel surrounding rocks. The overall layout of the two tunnels is reasonable. Secondly, rock burst with moderate strength or above will not occur in the two tunnels according to a comprehensive study using the rock strength-stress ratio method, Tao Zhenyu criterion, Russenes criterion and rock stress-strength ratio method. Thirdly we used Mohr-Coulomb criterion and Bayer's law, let the friction coefficient μ have the value between 0.6~1.0, and then we analyzed the present stress state of the two tunnels. It is found that the stress of the fault zone near the two tunnels did not reach the critical condition of sliding instability of shallow faults in the crust, while it is in a stable stress state.

     

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