外文資料翻譯---柔弱巖石上短距離隧道的動(dòng)態(tài)施工力學(xué)的研究-公路隧道-在線瀏覽
2025-07-31 04:46本頁(yè)面
【正文】 究 。 。 劉 紅州， 陳三佳（ 2020 年） 圖 1 有限元分析模型 5 圖 2 地表沉陷圖表 圖 3 圍巖的垂直位移（ mm） 圖 4 主要支撐的等量壓力 圖 5 螺栓的軸力圖 圖 6 次連接的等量應(yīng)力 圖 7 圍巖的塑性區(qū) Study on Dynamic Construction Mechanics of SmallDistance Tunnel in Soft and Weak Rocks Hengbin Wu (Corresponding author) Department of Civil Engineering, Chongqing Three Gorge University 780 Erduan Shalong Road, Wanzhou District, Chongqing 404000, China Email: Yunxiang He Department of Civil Engineering, Chongqing Three Gorge University 780 Erduan Shalong Road, Wanzhou District, Chongqing 404000, China Guoliang Song Liaocheng Jianyu Construction Engineering Co.,Ltd Liaocheng 252020, China Abstract 6 Based on the construction theory of New Austria Method(NAM), relyed on a tunnel project of small distance in soft and weak rocks, this paper builds the numerical model and simulates 3D finite element method elastoplastic of the construction process by the construction method of doublesidewalls. The displacement changes of some points around the tunnel are analysised with the tunnel’s excavation. The safety of the tunnel structure and stability of surrounding rock are estimated by analyzing the surface subsidence, forces undertaken by the supporting structures and plastic zone. The results show that the method of construction mentioned above is reasonable, the influence of the later tunnel excavation on the surface subsidence and tunnel deformations of the earlier tunnel excavation is relatively obvious. Keywords: Soft and weak rocks, Small distance tunnel, Dynamic construction mechanics, Numerical simulation 1. Introduction The excavation and supporting process of tunnel is a plicated mechanical process, the differences of construction process, excavation sequence and supporting time greatly influence on the mechanics effects of engineering structure systematic(SHE et al., 2020). Because of the plexity of the condition of surrounding rock, the ordinary analogy of projects is not enough in the plex lining in soft and weak rocks especially in the tunnel engineering with small distance, so it’s necessary to conduct the mechanical simulating and analyzing in different surrounding rock characters according to the different forcing stages in each load case during construction processes. In the aspect of the research on the tunnel lining in soft and weak rocks, SUN et al. (1994) builded the three dimension model considering the timespace effect of tunnel excavating surface. CHENG et al. (1997) analyzed the mechanical mechanism and carrying capacity of plex lining for tunnels with FLAC, and got some useful conclusions. JIN et al. (1996) conducted three dimension FEM (finite element method) numerical simulation to the excavation processes of circle tunnel using the nonlinear viscoelastic theory. Karakus(2020)elaborated three dimension excavating effect caused by plane strain analyses. Because the timespace effect could not be fully reflected, many researchers conducted three dimension FEM elastoplastic and viscoelastoplastic analyses to tunnel excavation(AN, 1994, XIAO, 2020 amp。, the strata dip angle is about 9176。 June 2020 rock meets the construction requirement, the initial parameters set of the tunnel structures are reasonable. Analysis of Forces Undertaken by Supports As can be seen from , the largest value which appears in the arch foot is . The onsite monitoring in the arch foot should be strengthened in the construction process. From , it can be found that, the axial force 9 of bolts is larger in the position of the vault and hance, the largest value is , which meets the requirement of the tensile strength. The mos
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