- 摘 要
-
（南京工業(yè)大學(xué)交通運輸工程學(xué)院， 南京 210000）
［摘要］以南京古建筑鼓樓為研究對象，結(jié)合南京地鐵四號線隧道施工方案，采用ANSYS通用有限元軟件建立分析模型，模擬計算隧道爆破開挖施工引起的鼓樓振動情況，并用試驗驗證了數(shù)值分析方法的可行性和可靠性。分析結(jié)果表明：振動波在鼓樓城闕中傳播以高頻為主，在碑樓以低頻為主；測點振動速度峰值隨藥量和進尺的增大而逐漸遞增，隨爆源距的增加而逐漸減小；高度放大效應(yīng)讓部分測點振動速度峰值隨爆源距的增大出現(xiàn)增大現(xiàn)象；鼓樓爆破施工藥量宜控制在60g以內(nèi)，進尺宜采用0-5m，并采取微差爆破技術(shù)減小振動效應(yīng)。
［關(guān)鍵詞］爆破振動； 古建筑； 振動速度峰值； 數(shù)值模擬
中圖分類號：TU311-3文獻標(biāo)識碼：A文章編號：1002-848X(2019)10-0026-04
Influence of tunnel blasting excavation on the vibration velocity of ancient buildings
Zhu Liming, Wu Zhiqiang, Xing Shiling, Miao Ningning
（School of Transportation Engineering, Nanjing Tech University, Nanjing 210000, China）
Abstract:By taking the Drum Tower ancient buildings in Nanjing as the research object, with reference to the tunnel construction condition of Nanjing subway line No.4, the dimensional model was made by the finite element software ANSYS. The vibration velocity responses of the Drum Tower ancient buildings under the condition of blasting excavation in tunnel was simulated and the feasibility and reliability of the numerical analysis method were verified by experiments. the results show that the vibration wave propagate with high frequency mainly in palace, with low frequency in stele building; the peak vibration velocities of measuring points increase with the increase of period charges and excavation footage and decrease with the increase of explosive source; the amplification effect cause the peak vibration velocities of some measuring points to increase of explosive source distance. Blasting period charge should be controlled within 60g, the excavation footage should be 0-5m, and the millisecond blasting technology should be used to reduce vibration hazards.
Keywords:blasting vibration; ancient building; peak vibration velocity; numerical simulation
*江蘇省科技廳前瞻性聯(lián)合研究項目(YB2015005-17)。
作者簡介：朱利明，學(xué)士，教授級高級工程師，碩士生導(dǎo)師，Email: Zhulm@njtech.deu.cn。
