隧道近距下穿山坡楼房爆破振动测试研究

发布时间：2018-01-08 03:19

本文关键词：隧道近距下穿山坡楼房爆破振动测试研究　出处：《岩土力学》2014年07期 　论文类型：期刊论文

【摘要】：以成渝客运专线新红岩隧道为工程背景,测试了隧道近距下穿山坡楼房爆破时引起的地面振动。通过对隧道浅埋侧(隧道地表斜坡下部)和深埋侧(隧道地表斜坡上部)的地表振动数据分析,研究了地表的振动速度、振动主频及振动安全评价方法。结果表明:在浅埋隧道爆破的近区,入射纵波为主要载体,地表水平和竖直方向振动的主要成分可以认为是入射纵波在水平和竖直方向的投影,浅埋侧和深埋侧地表水平和竖直方向振速的大小取决于爆心距和入射纵波与竖直方向的夹角两个因素;隧道采用电子雷管进行单孔连续起爆,相比非电雷管爆破,可以有效降低地表振动强度,同时能够提高地表振动主频;地表振动主频方面,地表竖直方向振动主频普遍高于水平方向,而且浅埋侧地表竖直和水平方向主频大多高于深埋侧地表对应方向的主频;隧道近距下穿山坡楼房进行爆破施工时,建议在浅埋侧和深埋侧地表同时布置爆破振动监测测点,并根据浅埋侧和深埋侧地表测点的峰值振速、爆破振动主频与建筑物固有频率的关系对地表振动安全进行评价,以减少隧道施工爆破对地表环境和周围建筑物造成的振动破坏。
[Abstract]:Taking Xinhong Rock Tunnel of Chengdu-Chongqing passenger dedicated Line as the engineering background. The ground vibration caused by the blasting of a building passing through a hillside near the tunnel is measured. The surface vibration data of the shallow side of the tunnel (the lower part of the tunnel surface slope) and the deep side of the tunnel side (the upper part of the tunnel surface slope) are analyzed. The vibration velocity, vibration frequency and vibration safety evaluation method are studied. The results show that the incident longitudinal wave is the main carrier in the near area of shallow tunnel blasting. The main components of horizontal and vertical vibration on the surface can be considered as projection of incident longitudinal waves in horizontal and vertical directions. The magnitude of horizontal and vertical vibration velocities of shallow and deep buried surface depends on the distance between the detonation center and the angle between the incident longitudinal wave and the vertical direction. Compared with non-electric detonator blasting, the electronic detonator used in the tunnel can effectively reduce the ground vibration intensity and increase the main frequency of the surface vibration. The main frequency of surface vertical vibration is generally higher than that of horizontal direction, and the main frequency of shallow buried surface vertical and horizontal direction is mostly higher than that of deep buried surface. It is suggested that blasting vibration monitoring points should be arranged simultaneously on the shallow and deep side of the ground surface during the blasting construction of the buildings passing through the hillside in a short distance under the tunnel, and the peak vibration velocity of the surface measuring points on the shallow side and the deep side should be taken as the basis. The relationship between the main frequency of blasting vibration and the natural frequency of buildings is used to evaluate the safety of surface vibration in order to reduce the vibration damage caused by blasting in tunnel construction to the surface environment and the surrounding buildings.
【作者单位】：北京交通大学土木建筑工程学院;
【基金】：国家自然科学基金项目(No.51278042);国家自然科学基金项目(No.L1222021) 铁道部重点课题(No.2010G016-L-1)
【分类号】：U455.6
【正文快照】： 1引言随着国家铁路发展战略的逐步推进,城际高速铁路和客运专线建设工程逐年增多。我国西南地区连接成都和重庆两大城市群的成渝客运专线预计将于2015年建成通车,通车后成都至重庆运行时间缩短为75 min,将会极大地方便城市之间的交流及旅客的快速出行。成渝高速铁路进入重庆市

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