邻近电塔路堤设计方案模拟分析及比选

Simulation Analysis and Comparison of Design Schemes of Embankment near Electric Pylon

摘要:

广州市番禺区某工程拟建市政道路临近现状220 kV高压电塔，为减轻路堤填筑对现状高压电塔桩基的影响，保证道路施工引起电塔倾斜度满足设计规范要求。运用Soilworks软件建立二维有限元模型，以扶壁式挡土墙和路基填土方案为对照组，设定泡沫轻质土路堤和混凝土面板方案和路基填土、管桩复合地基方案为试验组。对比三种不同设计方案的路基边坡整体稳定性、电塔桩基的桩顶水平和竖向位移，结果表明：采用扶壁式挡土墙和路基填土组合的方案不满足水平位移要求。管桩复合地基方案更明显减小了电塔桩顶的水平位移，对桩顶竖向位移几乎没有影响。泡沫轻质土路堤方案能同时减小桩顶的水平和竖向位移，且对减小路基填筑引起的电塔倾斜度更有效果。

Abstract:

A municipal road in a project is proposed to construct near the existing 220 kV high-voltage electric pylon in Panyu District， Guangzhou. To mitigate the impact of embankment filling on the pile foundation of the existing high-voltage electric pylon， it is to ensure that the inclination of the electric pylon caused by road construction should meet the design specifications. A two-dimensional finite element model is established by using Soilworks software. Taking the buttress retaining wall and subgrade filling scheme as the control group， the foamed lightweight soil embankment with concrete panel scheme and the subgrade filling with pipe pile composite foundation scheme are regarded as the experimental group to compare the whole stability of subgrade slope， and the horizontal and vertical displacements of pile tops in electric pylon pile foundations of three design schemes. Results indicate that the combination of buttress retaining wall and subgrade filling in the scheme fails to meet the criteria for horizontal displacement. The pipe pile composite foundation scheme significantly reduces the horizontal displacement at the top of the electric pylon piles， and there is no influence on the vertical displacement at the pile top. The foamed lightweight soil embankment scheme can simultaneously reduce the horizontal and vertical displacements at the top of the piles， and is more effective to reduce the pylon inclination caused by subgrade filling.