The Application And Research Of Parameters About Back Analysis For Soft Rock In Yinhongjishi's Testing-Branch Tunnel Project

Based on the inspect research result of pre-expert, and combine the characteristic of YinHongJiSHi's testing-branch-tunnel. This paper give a deeper research of surround rock's movement rule in large depth and small tunnel with the excavation face move forward, And on the base of these research, this paper make a serch for the parameter's back analysis of surround rock. In the end, combining the YinHongJiSHi project, this paper give a prove to it's applicability and practicability, and give a detailed show to it's practicable.The main researches:(1) the movement rule of surround rock with the excavation face move forwardBased on multi-project's research of date gained from the construction. This paper give a deeper research of surround rock's movement rule in large depth and small tunnel with the excavation face move forward, which is the key for the back analysis.(2)The back analysis research about surround rock parameters of tunnelIn considering the excavation process and the shoting method, This paper introduced the method of back analysis research about surround rock parameters of tunnel, and give a detailed process about how to get the numberical result through back analysis(3)The back analysis of surround rock parameters and forecast of stability in YinHongJiSHi's testing branch-tunnelUsing the aboved method of back analysis, and basing the inspect of convergence for the section of 0+250~0+230 and 0+223 in YinHongJiSHi's testing branch-tunnel, we get the two section's real parameters, and optimized the lining structure.