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The change of rock mass pressure of Lianchengshan tunnel

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Abstract

Based on Lianchengshan tunnel, the changing of rock mass pressure with deformation, time and distance from the excavation face is analyzed by means of field monitoring and numerical simulation, and the main conclusions are as follows: (1) When the deformation increases rapidly, the rock mass pressure decreases first and then increases. After the settlement and clearance convergence are stable, the pressure of rock mass in each part is still increasing slowly. (2) The rock mass pressure is mostly between 0.1 and 0.3 MPa, and the variation lasts about 65 to 70 days. (3) During the period from mid-bench construction to inverted arch construction, the variation ratio of rock mass pressure is very high, which indicates that the stabilization time of this stage is too long. Therefore, it is suggested to shorten the length of mid-bench and lower-bench appropriately. (4) The space influence range of the excavation face propulsion is about 2.5 times the tunnel diameter of the hole (42 m). To decrease the rock mass pressure, ring closure should be reached as soon as possible. It is recommended to speed up the construction of middle bench and lower bench.

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Funding

Funding was provided by National Key  R&D Program of China (Grant No. 2018YFB1600100), National Natural Science Foundation of China (Grant Nos. 51678063, 41831286, 51808049), China Postdoctoral Science Foundation (Grant No. 2016M602738), The Chang Jiang Scholars Program (Grant No. Q2018209) and Natural Science Basic Research Plan of Shaanxi Province (Grant No. 2017JM5051).

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Correspondence to Pengyu Zhao.

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Chen, J., Luo, Y., Li, Y. et al. The change of rock mass pressure of Lianchengshan tunnel. Environ Earth Sci 79, 192 (2020). https://doi.org/10.1007/s12665-020-8885-9

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