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拟建杭州钱江铁路新桥与既有钱江二桥均采用钻孔灌注桩基础,由于二者桥台间距较近(约10.0m),新建铁路桥在钻孔桩施工过程中可能对二桥桩基础产生一定的扰动,使得二桥产生水平位移或沉降。本项目组通过在钱江二桥周围埋设测斜管、测斜仪、土压力盒、孔隙水压力计以及分层沉降仪等监测设备对新桥钻孔桩施工过程中周围土体的侧向变形、土压力、孔隙水压力以及分层沉降进行了现场实际监测。结果表明:钻孔桩施工对周围土体水平位移影响范围一般在5倍桩径范围之内;引起的最大沉降量仅为5mm;对周围土压力和孔隙水压力影响不大。因此,新桥钻孔桩施工对钱江二桥安全基本不存在影响。
Due to the close spacing between abutments and abutments (about 10.0m), the proposed new railway bridge in Qianqiao of Hangzhou Qianjiang Railway and the existing Qianjiang Second Bridge may be used in the construction of bored piles Bridge pile foundation produces a certain disturbance, making the second bridge produce horizontal displacement or settlement. The project team through the laying of the Qianjiang second bridge around the laying of inclinometer pipe, inclinometer, earth pressure box, pore water pressure gauge and layered sedimentation and other monitoring equipment on the construction of the new bridge during the construction of bored pile lateral lateral Deformation, earth pressure, pore water pressure and stratified settlement conducted on-site monitoring. The results show that the influence of bored pile construction on horizontal displacement of surrounding soil is generally within 5 times of pile diameter; the maximum settlement caused by bored pile construction is only 5 mm; and the influence on surrounding soil pressure and pore water pressure is insignificant. Therefore, the construction of the bored pile in Xinqiao has no impact on the safety of Qianjiang No.2 Bridge.