张玉琦, 蒋楠, 周传波, 吴廷尧, 罗学东, 夏宇磬. 地铁基坑爆破振动作用邻近高层框架建筑物结构动力响应[J]. 煤炭学报, 2019, 44(S1): 118-125. DOI: 10.13225/j.cnki.jccs.2019.0261
引用本文: 张玉琦, 蒋楠, 周传波, 吴廷尧, 罗学东, 夏宇磬. 地铁基坑爆破振动作用邻近高层框架建筑物结构动力响应[J]. 煤炭学报, 2019, 44(S1): 118-125. DOI: 10.13225/j.cnki.jccs.2019.0261
ZHANG Yuqi, JIANG Nan, ZHOU Chuanbo, WU Tingyao, LUO Xuedong, XIA Yuqing. Dynamic response of building structures with high-rise frames caused by blasting vibration at adjacent subway foundation pit[J]. Journal of China Coal Society, 2019, 44(S1): 118-125. DOI: 10.13225/j.cnki.jccs.2019.0261
Citation: ZHANG Yuqi, JIANG Nan, ZHOU Chuanbo, WU Tingyao, LUO Xuedong, XIA Yuqing. Dynamic response of building structures with high-rise frames caused by blasting vibration at adjacent subway foundation pit[J]. Journal of China Coal Society, 2019, 44(S1): 118-125. DOI: 10.13225/j.cnki.jccs.2019.0261

地铁基坑爆破振动作用邻近高层框架建筑物结构动力响应

Dynamic response of building structures with high-rise frames caused by blasting vibration at adjacent subway foundation pit

  • 摘要: 为保证城市地铁基坑工程爆破开挖过程邻近高层建筑的安全稳定,分析爆破振动作用下建筑结构动力响应特性是其关键。以武汉地铁8号线洪山路站—小洪山站区间竖井基坑工程为工程依托,通过现场爆破试验及振动测试,分析基坑开挖爆破振动沿地表衰减规律及其对建筑物结构的影响; 同时,采用LSDYNA动力有限元数值计算方法,结合爆破试验测试结果,验证数值计算模型及参数的可靠性。根据高层建筑爆破振动安全控制标准,提出了基坑开挖爆破最大单段控制药量。通过此工况条件下的动力数值验算,分析了高层建筑物爆破振动速度、动应力空间分布特征,评估了爆破振动作用下邻近高层框架建筑物的安全稳定性。研究结果表明:① 通过爆破试验分析,在爆破振动传播过程中,高层建筑具有振动速度放大效应,顶楼振速相对于一楼放大倍数为1.19~1.26倍; ② 相同药量,不同开挖深度条件下,随着开挖深度增加,振动速度以衰减为主,高层建筑放大倍数不会受到影响; ③ 通过比对实测数据与数值模拟结果,两者最大误差率仅为6.83%,表明数值模型及参数的可靠性; ④ 高层建筑波速传递有着明显的衰减效应和放大效应,顶楼振速随着楼层的增加,波速呈先衰减后放大的现象; ⑤ 依据现场实测拟合出峰值振速衰减经验公式,现场爆破最大单段药量可控制为15 kg,以此可指导现场爆破安全施工。

     

    Abstract: In order to ensure the safety and stability of the high-rise building adjacent to the blasting excavation process at the adjacent urban subway foundation pit, it is the key to analyze the dynamic response characteristics of the building structure under the action of blasting vibration.Based on the foundation pit engineering of Hongshan Road Station and Xiaohongshan Station of Wuhan Metro Line 8, this paper analyzes the attenuation law of blasting vibration along the surface of the foundation pit and its influence on the structure of the building through on-site blasting test and vibration test.Meanwhile with the application of the LSDYNA dynamic finite element method, the results of blasting test is used to verify the reliability of the numerical calculation model and parameters.The maximum single-stage control dose of foundation pit excavation blasting is proposed according to the safety control standard of blasting vibration of high-rise buildings.The calculation of dynamic numerical values under these working conditions is used to analyze the spatial distribution characteristics of blasting vibration velocity and dynamic stress of high-rise buildings and evaluate the safety and stability of adjacent high-rise frame buildings under blasting vibration.The results show that through the blasting experiment analysis, in the process of blasting vibration propagation, the high-rise building has the vibration speed amplification effect, and the top floor vibration speed is 1.19-1.26 times relative to the first floor magnification.Under the same dosage and different excavation depths, as the excavation depth increases, the vibration speed is mainly attenuated, and the high-rise building magnification will not be affected.By comparing the measured data with the numerical simulation results, the maximum error rate of the two is only 6.83%, indicating the reliability of the numerical model and parameters.The wave velocity transmission of high-rise buildings has obvious attenuation effect and amplification effect.The vibration of top floor increases with the increase of floor, and the wave velocity is first attenuated and then amplified.Fitting the empirical formula of peak vibration velocity attenuation based on field measurement, the maximum single-stage dose of on-site blasting can be controlled to 15 kg, which can guide the on-site safe blasting.

     

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