中文摘要：

以莞惠城际隧道下穿密集建筑区段为依托,利用现场监测结果、室内模型试验以及动静结合的数值模拟方法,对城市隧道穿越不同结构类型、位置和高度的既有房屋时的综合影响进行研究。研究结果表明：房屋基础埋置较浅的浅埋隧道段,砌体结构房屋变形和振速均比框架结构大,随着楼层高度增加,房屋水平位移的影响明显大于竖向位移,且低层结构更易发生受拉破坏,同时振速呈现出放大效应;隧道静力开挖时,位于掌子面前方的结构受力和位移均明显大于后方的房屋结构;随着爆心距增大,振速逐渐变小,但到达远端墙体时振速出现放大趋势,在确定监控方案时,需考虑对远方墙体的振动监控;爆心距离越小,其振速高度效应越明显,需重点监测顶层的振速;在上软下硬复合地层中,隧道开挖影响范围距掌子面约20 m,偏离隧道中心线超过20 m时,沉降速率增大,量值呈明显减小的趋势。

英文摘要：

Based on Guanhui intercity tunnel passing underneath dense -constructed areas, this paper used the field monitoring results, laboratory model tests, dynamic and static combining numerical simulation method, to analyze the comprehensive influences when urban tunnels passing existing buildings with different structural types, location and height. The research shows that under the shallow buried tunnel section of the shallow building foundation, the deformation and vibration velocity of masonry structures are larger than frame structures. With the increase of floor height, the influence of horizontal displacement is significantly greater than vertical displacement, the tensile damage of lower structures is more likely to occur, and at the same time, vibration velocity presents the amplification effect. At the time of static tunnel excavation, the stress and displacement of structures located in front of tunnel face are significantly greater than those behind the tunnel face. When the blast center distance increases, the vibration velocity decreases gradually; however, when it arrives at the distal wall the vibration velocity increases. Consequently, when determining the monitoring plan, the vibration monitoring of distant wall should be considered. The smaller the blast center distance, the more obvious effect of vibration velocity height. The top velocity should be mainly monitored. In upper- soft and lower- hard ground, the influence scope of tunnel excavation is about 20 m measured from the tunnel face. When deviation from the tunnel centerline exceeds 20m, settling velocity increases, and the magnitude of settlement decreases significantly.