砂卵石地层盾构隧道施工地表沉降槽宽度系数分析

摘要

首先对比分析当前沉降槽宽度的计算方法,优选出O'Reilly&New经验公式.然后通过成都地铁7号线现场实测地表沉降数据对O'Reilly&New经验公式进行修正,得出地表沉降最大值,绘制沉降曲线,从而达到预测地表沉降的目的.经成都地铁3号线的实测数据验证,修正后的经验公式能较为准确地计算出沉降槽宽度,适用于砂卵石地层盾构隧道地表沉降的预测.%T he existing methods to calculate the settlement trough width are compared and the O'reilly& New empirical formula outweighs. T his formula is corrected based on the measured ground surface settlement of Chengdu M etro line 7. T he maximum settlement value is obtained. A settlement curve is drawn,which may be used to predict the ground surface settlement. T his corrected formula is validated by the measured ground surface settlement of Chengdu Metro line 3. T he settlement trough width may be calculated accurately with this corrected formula. It may be applied to predict the ground surface settlement of the shield-driven tunnel in sandy cobble stratum.