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根据现有的技术手段,在软土地区修建专用电缆隧道一般采用顶管法或盾构法,而在硬质岩地区则选用浅埋暗挖法。一般情况下,电缆隧道周边的构筑物或管线对地层变形允许值要求都比较高,当浅埋暗挖电力隧道采用国家电网公司推荐的直墙拱形断面时,隧道施工引起的周边地层变形都较大,实施过程往往需要迁改地下管线。在对双回路超高压电力电缆空间需求分析的基础上,优化隧道内的电缆及其附属设施的布置方案,而后采用三心圆法绘制曲墙拱形的浅埋暗挖隧道断面;与此同时,采用数值分析方法对隧道施工过程引起的周边地层变形进行模拟。分析结果显示:采用三心圆形法的隧道断面较直墙拱形隧道断面减小周边地层变形量达15%以上,带来了良好的环境效益;研究结果指导工程建设,并为类似工程建设提供参考。
According to the existing technical means, the construction of special cable tunnels in soft soil area generally adopts the pipe jacking method or the shield method, while in the hard rock area, the shallow buried tunneling method is adopted. Generally speaking, the structures or pipelines surrounding the cable tunnel have relatively high requirements for the allowable deformation of the ground strata. When the shallow burying power tunnel adopts the straight-walled arched section recommended by State Grid Corporation of China, the surrounding strata deformation caused by tunnel construction is more Large, the implementation process often need to relocate underground pipelines. Based on the analysis of the space requirement of double-circuit EHV power cables, the layout of the cables and their ancillary facilities in the tunnel is optimized, and then the cross-section of the shallow-arched and undercut tunnels with curved arches is drawn by the three-circle method. Meanwhile, , The numerical analysis method is used to simulate the deformation of the surrounding ground caused by tunnel construction. The analysis results show that the cross-section of tunnel with three-heart circular method reduces the deformation of the surrounding strata by more than 15% compared with that of the straight-walled arched tunnel, which brings good environmental benefits. The research results guide the construction of the tunnel and provide similar engineering construction for reference.