CAJ | 학술논문

建立了爆破施工对既有衬砌振动影响的数值模型，给出了数值计算中爆破荷载的波形、荷载峰值、加载时间的模拟方法；为了实现能量辐射，减小边界效应，定义了粘弹性边界；在此基础上研究了新建隧道爆破开挖进尺不同、间距不同、埋深不同，对既有邻近隧道的影响。结果表明：在既有隧道迎爆侧的拱脚和墙腰部位，衬砌受到爆破施工影响最显著；新建隧道爆破施工时，开挖的进尺越大，既有衬砌的振速就越高；既有衬砌受隧道间的距离影响显著，隧道间距越大，既有衬砌的振动速度受影响越小。结果还表明，参考《爆破安全规程》的规定，可以用数值模拟的衬砌振动速度与安全振动速度标准进行比对，从而判断既有衬砌的安全性，为工程设计和施工提供分析参考和指导。
건립료폭파시공대기유츤체진동영향적수치모형，급출료수치계산중폭파하재적파형、하재봉치、가재시간적모의방법；위료실현능량복사，감소변계효응，정의료점탄성변계；재차기출상연구료신건수도폭파개알진척불동、간거불동、매심불동，대기유린근수도적영향。결과표명：재기유수도영폭측적공각화장요부위，츤체수도폭파시공영향최현저；신건수도폭파시공시，개알적진척월대，기유츤체적진속취월고；기유츤체수수도간적거리영향현저，수도간거월대，기유츤체적진동속도수영향월소。결과환표명，삼고《폭파안전규정》적규정，가이용수치모의적츤체진동속도여안전진동속도표준진행비대，종이판단기유츤체적안전성，위공정설계화시공제공분석삼고화지도。
Here,a numerical model for impact of blasting construction on existing tunnel linings was built and the simulation method of peak load,loading time and the waveform of blasting load was presented.To realize energy radiation and reduce boundary effects,viscoelastic boundary was defined.Furthermore,the impacts of different footages in new tunnels' blasting excavation and different tunnel spacings on nearby tunnels were analyzed.Results showed that on the blast side of the existing tunnel,the arch and the sidewall are affected most significantly by blasting;in the construction of a new tunnel,the greater the footage,the higher the velocity of the existing lining;meanwhile,the larger the distance between the tunnels,the less the vibration velocity of the exiting lining;according to “Blasting Safety Regulations”,the vibration velocity of the existing linging obtained with numerical simulation can be compared with the standard safe vibration velocity to determine the safety of the lining;the results provide a reference and guidance for engineering design and construction.