黄土地区井筒式地下连续墙基础的长期监测与分析

Long-term monitoring and analysis of shaft diaphragm wall foundation in loess areas

以山西某在建拱桥为依托,对其采用的井筒式地下连续墙基础进行长期监测,研究了在不同工作状态下,井筒式地下连续墙各片墙所承受的轴力与侧摩阻力的分布规律,特别在正常工作荷载下,闭合墙基础的承载性状类似于端承摩擦墙。并结合土压力盒所测墙周土体作用于工程墙的土反力值,分析了承台与土芯之间的作用并不显著,且在运营阶段,墙内土芯对闭合墙的水平承载力贡献小,而外侧的上部表层土和浅层土对工程墙基础的水平承载力影响很大。

Depending on an arched bridge under construction in loess areas,long-term monitoring is taken for the shaft diaphragm.Under different working conditions,the distribution laws of axial force and skin friction of each diaphragm wall are studied.The bearing properties of the closed walls are similar to those of end bearing friction wall particularly in the normal working load.Combined with the values of soil reaction measured by earth pressure cells imposed by the soil around the wall,the interaction of soil core and cap has no significant interaction and soil core in the wall has little contribution to resist lateral load in the working stage,but the top soil and shallow soil outside have greater influence on the closed wall.