软土地区某大型沉井的下沉监测数据分析

为了研究深厚软土地区某大型沉井下沉过程中的受力状态,通过施工阶段的现场监测数据分析了沉井基础底部和侧面的受力分布规律。结果表明,初期端阻力随深度的增加而缓慢增长,入土较深时上、下游井壁端阻力值表现出较大幅度的增长,而中隔墙底的端阻力值呈现相反的减小趋势;随着沉井下沉的深入,侧壁土压力受吸泥扰动的影响逐渐减小,土压力值与入土深度呈线性增长关系,整体介于静止土压力和被动土压力之间。

ANALYSIS OF THE MONITORING DATA OF A MASSIVE OPEN CAISSON SINKING IN SOFT SOIL AREA

To study the force states during sinking process of a large caisson in deep soft soil area, the stress distribution law of the bottom and side walls of the caisson foundation were analyzed through in-siTUmonitoring data in construction stage. The results show that the initial resistance increases slowly with the increase of depth, while the end resistances of upstream and downstream side walls increase considerably at the depth of penetration, and the end resistances at the bottom of partition walls shows an opposite decrese. With the deepening of the caisson sinking, the influence of mud suction disturbance on the lateral wall soil pressure decreases gradually, and the value of earth pressure increases linearly with the depth of penetration, the whole is generally between the static earth pressure and the passive earth pressure.