斷層帶深埋小凈距隧道穩(wěn)定性及施工方案優(yōu)化分析
[Abstract]:Fault is a kind of discontinuous structural trace produced by a large amount of strain energy accumulated in rock stratum to a certain extent. The rock mass integrity of fault zone is poor and the bearing capacity is low. It is easy to cause collapse during tunnel construction. Based on the Dapingwei tunnel project in Cangnan County of Wenzhou City and the existing research results, this paper makes a thorough and systematic study on this subject. (1) The formation mechanism of faults is expounded, and the stability of faults to tunnel excavation at different oblique positions is analyzed by numerical simulation. The results show that the existence of faults will make the displacement of surrounding rock increase significantly, and make the displacement distribution around the tunnel asymmetric, the distribution of the interruption zone of tunnel excavation section has a decisive effect on the displacement of surrounding rock; (2) The construction scheme of deep buried small clearance tunnel with fault zone is optimized, and the mining is simulated and analyzed. The mechanical characteristics of the tunnel before and after entering the fault are analyzed by using the full section method, the step method and the single-sidewall heading method. The results show that the step method is the most suitable method for excavating the grade IV surrounding rock section before entering the fault, and the single-sidewall heading method should be used for excavating the surrounding rock containing the fault. The results show that the influence of excavation sequence on the stability of the tunnel is small. (3) The monitoring data of the fault F6 of the Dapingwei tunnel are analyzed and compared with the results of theoretical analysis. Advanced numerical methods and analysis methods have been used to study the stability of deep-buried tunnels with small clearance. The research results have high engineering application value and can be used for reference in the design and construction of similar projects.
【學(xué)位授予單位】:長(zhǎng)沙理工大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2015
【分類號(hào)】:U455.4
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