兰州砂卵石地层盾构施工振动传播及衰减特性分析
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摘要
盾构施工诱发周边地表振动已成为突出的环境振动问题。依托兰州某砂卵石地层盾构施工标段,通过隧道-地表同步采集三向振动加速度,研究盾构施工诱发振动在地表50 m×50 m范围内的时域、频域传播规律。结果表明:(1)地表自由场地加速度随距离的传播呈现先放大后急剧衰减的趋势。X向会出现局部放大反复的现象。(2)横断面最大峰值为0.33 m/s~2,但盾构施工诱发振动将对敏感的古建筑产生不利影响。(3)50 m范围内地表频率主要以4~80 Hz为主,各频段振动级并非随振源距离的增加单调衰减,与场地土层卓越频率接近的频段存在较大的反弹现象。(4)在盾构诱发环境振动的评价中应考虑三向振动的影响。
Ground vibration induced by shield construction has become a major environmental vibration problem in urban areas. Based on a sandy pebble formation of a shield construction in Lanzhou, by synchronizing the test tunnel and three-direction vibration acceleration on the surface of the earth, this paper studies the shield construction-induced vibration in the time domain, and frequency domain propagation law within the surface of the 50 m×50 m area. The findings of this study are as follows: 1) the spread of the surface free field acceleration with the distance firstly increases and then sharply attenuates. In X direction, the amplification phenomenon repeatedly appears; 2) the transverse maximum peak of 0.33 m/s~2 is harmful to sensitive ancient buildings; 3) within the scope of 50 meters, the surface frequency mainly ranges from 4 to 80 Hz, the vibration spectrum magnitude does not monotonously decrease with the increase of the vibration source distance, but has rebounding phenomenon, which is associated with excellent frequency field soil; 4) the influence of three directions of vibration should be considered in the evaluation of shield induced environmental vibration.
Ground vibration induced by shield construction has become a major environmental vibration problem in urban areas. Based on a sandy pebble formation of a shield construction in Lanzhou, by synchronizing the test tunnel and three-direction vibration acceleration on the surface of the earth, this paper studies the shield construction-induced vibration in the time domain, and frequency domain propagation law within the surface of the 50 m×50 m area. The findings of this study are as follows: 1) the spread of the surface free field acceleration with the distance firstly increases and then sharply attenuates. In X direction, the amplification phenomenon repeatedly appears; 2) the transverse maximum peak of 0.33 m/s~2 is harmful to sensitive ancient buildings; 3) within the scope of 50 meters, the surface frequency mainly ranges from 4 to 80 Hz, the vibration spectrum magnitude does not monotonously decrease with the increase of the vibration source distance, but has rebounding phenomenon, which is associated with excellent frequency field soil; 4) the influence of three directions of vibration should be considered in the evaluation of shield induced environmental vibration.
引文
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[14]中华人民共和国国家环境保护局.GB10070—88城市区域环境振动标准[S].北京:中国标准出版社,1988.The People’s Republic of China State Environmental Protection Agency.GB10070—88 Urban regional environmental vibration standard[S]Beijing:China Standard Publishing House,1988.
[2]陶连金,郭飞,黄俊,等.砂卵石地层盾构施工诱发振动环境影响试验研究[J].振动与冲击,2015,34(16):213-218.TAO Lian-jin,GUO Fei,HUANG Jun,et al.Field tests for environment vibration induced by shield tunneling in sand gravel layer[J].Journal of Vibration and Shock,2015,34(16):213-218.
[3]黄俊,张波,刘璐.砂卵石地层盾构施工振动环境影响测试分析[J].施工技术,2013,42(7):85-88.HUNG Jun,ZHANG Bo,LIU Lu.Field-test research on the surface vibration caused by shield construction in sand gravel layer[J].Construction Technology,2013,42(7):85-88.
[4]王鑫,韩煊,周宏磊.中心城区地铁盾构施工引起的环境振动响应研究[J].土木工程学报,2015,48(增刊2):309-314.WANG Xin,HAN Xuan,ZHOU Hong-lei.Research on environment vibration response induced by metro shield tunneling in central urban area[J].China Civil Engineering Journal,2015,48(Supp.2):309-314.
[5]张雄雄.兰州地铁运营对白衣寺塔振动影响分析[D].兰州:兰州交通大学,2013.ZHANG Xiong-xiong.Vibration impact analysis of the White Temple Tower of Lanzhou subway operators[D].Lanzhou:Lanzhou Jiaotong University,2013.
[6]马晓理.轨道交通对兰州城市发展的影响及响应措施研究[D].兰州:兰州大学,2015.MA Xiao-li.Research on the influence and the response measures of rail transit to the development of Lanzhou[D].Lanzhou:Lanzhou University,2015.
[7]中华人民共和国国家环境保护局.GB10071—88城市区域环境振动测试方法[S].北京:中国标准出版社,1988.The People’s Republic of China State Environmental Protection Agency.GB10071-1988 Urban regional environmental vibration testing method[S].Beijing:China Standard Publishing House,1988.
[8]王济,胡晓.MATLAB在振动信号处理中的应用[M].北京:中国水利水电出版社,2006.WANG Ji,HU Xiao.The application of MATLAB in vibration signal processing[M].Beijing:China Water Conservancy and Hydropower Press,2006.
[9]袁扬,刘维宁,刘卫丰.基于现场测试的曲线段地铁地面振动传播规律[J].中国铁道科学,2012,33(4):133-138.YUAN Yang,LIU Wei-ning,LIU Wei-feng.Propagation law of ground vibration in the curve section of metro based on in-situ measurement[J].China Railway Science,2012,33(4):133-138.
[10]邹超,汪益敏,汪朝晖.地铁车辆段咽喉区地面振动传播规律实测与分析[J].振动与冲击,2015,34(16):200-206.ZOU Chao,WANG Yi-min,WANG Zhao-hui.Field measurement and analysis of ground vibration in the throat area of metro depot[J].Journal of Vibration and Shock,2015,34(16):200-206.
[11]夏禾.交通环境振动工程[M].北京:科学出版社,2010:164-165.XIE He.Traffic environment vibration engineering[M].Beijing:Science Press,2010:164-165.
[12]王福彤,陶夏新,崔高航,等.地面城轨交通近轨道区域自由地表振动实测研究[J].振动与冲击,2011,30(5):131-135.WANG Fu-tong,TAO Xia-xin,CUI Gao-hang,et al.Test in situ for free ground vibration near urban railway line[J].Journal of Vibration and Shock,2011,30(5):131-135.
[13]胡仲有,杨仕升,李航.地脉动测试及其在场地评价中的应用[J].世界地震工程,2011,27(2):210-218.HU Zhong-you,YANG Shi-sheng,LI Hang.Ground microtremor test and its application in evaluation of sites[J].World Earthquake Engineering,2011,27(2):210-218.
[14]中华人民共和国国家环境保护局.GB10070—88城市区域环境振动标准[S].北京:中国标准出版社,1988.The People’s Republic of China State Environmental Protection Agency.GB10070—88 Urban regional environmental vibration standard[S]Beijing:China Standard Publishing House,1988.