【摘要】 地铁多为近距离双线并行隧道,隧道开挖时相互影响造成了地表的不规则沉降与叠加,其预测与控制已成为一个亟待解决的难题。基于随机介质理论,将直角坐标系转化为局部极坐标系,得到了任意断面形状的单线、双线隧道开挖引起的地表沉降公式。以哈尔滨地铁3号线某区间大断面隧道与标准断面隧道开挖为例,基于随机介质理论极坐标表达式,得到了不同断面形状、尺寸的并行隧道开挖地表沉降量及其分布规律。通过预测曲线与实测及数值模拟曲线的对比,验证了用随机介质理论极坐标表达式预测并行隧道开挖引起地表沉降的科学性和可靠性。更多还原

【Abstract】 Most metro tunnels are two-line parallel tunnels with a short interval range. The interaction resulted from the excavation of two tunnels could bring about the irregular settlement and superposition, the prediction and control of settlement has become an urgent scientific problem. Based on the stochastic medium theory, transforming the rectangular coordinate system into the local polar coordinate system, the equations of ground settlement caused by the excavation of single-line tunnel and two-line tunnels with different cross-section shapes are obtained. We take the excavation of a large cross-section and a standard cross-section of Harbin Metro Line 3 as example. The ground settlement and its distribution law caused by excavation of the parallel tunnels with different cross-section shapes and sizes are obtained by using the deduced polar coordinates equations. The comparing the predicted curve to the measured and numerical simulation curves shows that the polar coordinates equations of stochastic medium theory are scientific and reliable in predicting the ground settlement caused by the excavation of parallel tunnels.更多还原