管棚夯管法施工对周边环境影响分析

管棚夯管法施工对周边环境的影响不容忽视,诸如管棚施打和注浆时,所引起的噪音、振动、地层和既有结构的隆沉等不利影响。以浅埋暗挖法下穿既有运营车站施工为例,对管棚夯管法施工对周边环境的影响进行了监测、分析。结果表明:1)夯管法施工应采取"间隔施打,先中间、后两侧,先下排、后上排"的顺序进行,并控制注浆参数,从而可有效控制管棚施工对地层、既有车站变形、轨道沉降的影响程度;2)管棚的夯打和注浆直接影响既有结构和轨道的隆沉;3)管棚施工过程中,地层产生微小沉降,而既有结构表现为整体隆起。

Analysis on Influence of Roof Pipe Ramming on Surrounding Environment

The ramming of the roof pipes has such adverse effect on the surrounding environment as noise, vibration and settlement of ground and existing structures, and these adverse effect cannot be ignored. A Metro station under construction crosses underneath an existing Metro station and roof pipes are rammed to ensure the safety of the construction and the safety of the existing Metro station. In the paper, the influence of the roof pipe ramming on the surrounding environment is monitored and analyzed. Conclusions drawn are as follows: 1) The roof pipes should be installed alternatively, with the central ones being installed before the side ones and the ones of the lower row being installed before the ones of the upper row, and the grouting parameters should be well controlled, so as to bring the influence of the roof pipe ramming on the settlement of the ground, the existing Metro station and the existing tracks under effective control; 2) The roof pipe ramming and the grouting have close relationship with the settlement of the existing structure and the existing tracks; 3) During the roof pipe ramming, slight settlement occurs to the ground, however, overall heaving occurs to the existing structure.