上海地区地铁隧道盾构施工地面沉降分析

Ground settlement due to shield construction in Shanghai metro tunnel project

根据上海地铁明珠线浦东南路站—南浦大桥站区间隧道盾构推进引起的地面沉降的实际观测数据,分析常用的地面沉降槽计算经验公式对于上海地区软土中修建的地铁盾构隧道的适应性,提出了地铁盾构隧道横断面上地表沉降预测公式参数确定方法以及纵断面上地表沉降分布修正计算公式及其参数确定方法.应用结果表明,该计算公式能较好地预测盾构施工引起的地面沉降分布.

Based on the measured data of ground settlement due to the shield driving in the construction of the Pearl line of the Shanghai metro from the South Pudong station to the Nanpu Bridge station, the applicability of the empirical formula for settlement trough calculation to the shield construction of the Shanghai metro in soft clay is analyzed. A method is proposed for determination of parameters for the predicting formula of ground settlement along the transversal section of shielddiven tunnels.Furthermore, a modified formula is presented for calculation of the ground settlement distribution over the longitudinal section, and the method for its parameter determination is also given. Practice shows that the formula can well predict the ground settlement distribution induced by shield construction.