摘要
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。
Both the foundations of the under-construction Qianjiang New Rail-Bridge and the existing Qianjiang Second Bridge are bored pile foundation.As they are close to each other（about 10m）,the foundation of the Qianjiang Second Bridge may be disturbed by the bored pile＇s construction of the new rail-bridge.Moreover,it may result in the horizontal and vertical movements of the existing bridge.The project team has monitoring on lateral movement,earth pressure,pore water pressure and layered settlement of the soil around the under-construction bored pile through laying the gradient tubes,inclinometers,earth pressure cells,pore water pressure gauges and telescoping tube settlement gauges.It is found that the soil lateral movements caused by the construction of the new bridge＇s bored pile are mainly within the limit of five times bored pile diameters and maximum settlements are merely 5mm,and the construction of the new bridge＇s bored pile has little effect on the earth pressure and pore water pressure of surrounding soils.Therefore,the construction of the new bridge＇s bored pile has little influence on the safety of the Qianjiang Second Bridge.
出处
《工程勘察》
CSCD
2012年第3期27-32,共6页
Geotechnical Investigation & Surveying
关键词
钻孔桩
施工
侧向变形
土压力
孔隙水压力
分层沉降
bored pile
construction
lateral movement
earth pressure
pore water pressure
layered settlement
