【作者】 顾翠莲；

【导师】 夏才初；

【作者基本信息】 同济大学 ， 结构工程， 2007， 硕士

【摘要】 特大断面相邻隧道在我国的建设将愈来愈多，由于隧道跨度大，两隧道爆破施工必然存在相互影响，开挖爆破产生的地震波会危及隧道围岩的安全和稳定性。本文基于动力有限元的基本原理，通过ANSYS/LS-DYNA软件对特大断面隧道施工的相互影响作了数值分析，得到一些有益的规律和结论。 本文首先对岩石中的爆炸理论与爆破振动影响控制标准作了阐述；结合实际工程对现场实测数据作了回规分析，得出不同方向的振速衰减公式，并对现场实测的振速时程曲线作了分析，总结出一些规律；对隧道掘进爆破数值模拟算法原理与分析模型作了分析和说明；应用动力有限元ANSYS／LS-DYNA程序对特大断面双线隧道的爆破施工进行了三维模拟。得出相邻特大断面隧道爆破施工相互影响的规律和特点。分别研究左右线起爆对相邻隧道的动力影响，研究不同断面振速极值的位置，出现的时间及衰减的规律，不同方向振速峰值出现的时间特征，对左右两隧道的应力也作了分析，得出应力峰值出现的时间及位置。更多还原

【Abstract】 Double line tunnel with extra-large sections will be more and more common in the country, due to the large section, it is certain that the double line tunnel affects each other during the blasting excavation, the seismic wave produced by tunnel excavation affects the safety and stability of the surrounding rock. Based on the dynamic finite element, the mutual influence of double line tunnel with extra-large sections is analyzed by means of ANSYS/LS-DYNA software in the essay, and some useful rules and conclusions are got.The explosion theory and controlling standards of vibration in rock are first expounded in the essay. Regression analysis is performed with the data measured in the project, thus declining formulas of velocity in different directions are got, also some rules are obtained from the analysis of the velocity-time curves. The simulation principle and model of blasting excavation of tunnels are analyzed and introduced in the essay, 3D simulation of blasting excavation of the double-line tunnels with extra-large sections is performed by means of dynamic finite element ANSYS/LS-DYNA software. The rule and character of the mutual influence of blasting excavation in double line tunnel with extra-large sections are got. Dynamic effect of blasting excavation in the left line and the right line is respectively researched, the locations of velocity extreme values of different sections are studied, as well as the occurrence time and declining rule. The character of occurrence time of velocity extreme values in different directions is got, the stress of double line tunnel is also analyzed, and the occurrence time and locations of the stress extreme values are obtained.更多还原