电力顶管隧道施工对周边环境的影响

The Influence of Electric Power Pipe Jacking Tunnel Construction on the Surrounding Environment

探究电力顶管隧道施工对周边环境的影响对城市的可持续发展和提升居民的生活质量至关重要。文章依托紫金港科技城220kV架空线移位改造工程,采用数值模拟方法模拟矩形顶管施工过程,在模拟值与计算值吻合的基础上探究了不同土仓压力及注浆压力对隧道周边土体地表沉降及地表纵向位移的影响。结果表明,土仓压力越大,掌子面前方土体的水平应力越大、地表沉降越小;土仓压力大于0MPa后,将出现地表隆起现象;注浆压力越大,地表沉降越小,增大注浆压力对地表纵向位移的影响不明显,地表纵向位移最大增幅仅为1.41mm。

It is very important to explore the influence of electric power pipe jacking tunnel construction on the surrounding environment for the sustainable development of the city and the improvement of the life quality of residents.Based on the relocation reconstruction engineering of 220 kV overhead line in Zijingang Science and Technology City,this paper uses numerical simulation method to simulate the rectangular jacking pipe construction process.On the basis of the agreement between the simulated value and the calculated value,the influence of different soil chamber pressures and grouting pressures on the surface settlement and surface longitudinal displacement of the soil around the tunnel is explored.The results show that the greater the soil chamber pressure is,the greater the horizontal stress of the soil in front of the tunnel face is and the smaller the surface settlement is.When the soil chamber pressure is greater than O MPa,the surface uplift will occur.The larger the grouting pressure is,the smaller the surface settlement is.The effect of increasing the grouting pressure on the longitudinal displacement of the surface is not obvious,and the maximum increase of the longitudinal displacement of the surface is only 1.41 mm.