Research On Key Technology Of Power Tunnel Construction Under Urban Complex Environment

In recent years, with the advance of the economy and the rapid development of power grid construction, the cable tunnel become a key technical means to solve contradictionsbetween the growing need of the power load and relatively insufficientof power channel resources.also between the high standards of modern city landscape and shortage of ground resources. Based on the cable tunnel from Zhaojue substation to Amusement park substation in complex urban environmental conditions.Thisthesis focus on studying issues ofrapid construction technology of power tunnel construction under urban complex environment, and building stability undercable tunnel adjacent construction by using literature investigation, numerical simulation and field testing. Main research results are summarized as follows:1. Combined with the geologicaland hydrogeologicalfeatures of Chengdu, this paper analyses and contrasts three kinds of common methods to construct the electric tunnel:shallow buried miningmethod, pipe jacking method, shield method. In accordancewith the actual project situation,the shallow buried mining method was chosen to construct the municipal power passage project from Zhaojue Temple substation to Amusement Park substation.2. This thesis puts forward a new method using GFRP anchor and small pipe grouting. In this way, it can play a role in strengthening the tunnel face, maintaining the face stability, and reducingthe deformation, consequently, it can behelpful for fast construction of the electric tunnel.3. By studying on the adjacent construction case of cabletunnel by finite difference method, we can indicate that the cable tunnel construction has none influenceon the existing tunnel.4. The results of numerical simulation are in good agreement with the observed data of field monitoring, thedifferences are small.It can be proved that the numerical modelcan simulate the cable tunnel construction well.