基于Midas/GTS的公路隧道爆破施工对地表高层建筑影响的研究

Research on Influence of Highway Tunnel Blasting Construction Based on Midas/GTS on Surface High-rise Buildings

为了研究某城市公路隧道出口浅埋段爆破施工对附近既有高程剪力墙-框架住宅建筑物的影响,在分析其施工难点的基础上,基于有限元软件Midas/GTS建立三维有限元模型,通过在有限元模型中设置软弱夹层,研究了不同软弱夹层厚度(0~20 m)和倾角(0~60°)工况下,爆破施工对住宅楼不同楼层的影响及应力衰减规律。研究表明,随着软弱夹层厚度的增加,轴向拉应力衰减程度逐渐变大,而轴向压应力衰减程度逐渐变小;随着软弱夹层角度的不断变大,轴向压、卡应力衰减程度均变大。当炸药量为34.3 kg时,爆破引起的住宅最大轴向压、拉应力分别为-0.98和0.882 MPa,可保证住宅楼的结构安全。

In order to study the influence of the blasting construction of the shallow tunnel section of a city highway tunnel exit on the existing high-rise shear wall-frame residential buildings,this paper builds a three-dimensional finite element model based on the finite element software Midas/GTS based on the analysis of its construction difficulties.By setting the weak interlayer in the finite element model,the effects of blasting construction on different floors of residential buildings and stress decay laws under different soft interlayer thickness(0~20 m)and dip angle(0~60°)were studied.The results show that with the increase of the thickness of the weak interlayer,the attenuation of the axial tensile stress gradually becomes larger,and the attenuation of the axial compressive stress becomes smaller.As the angle of the weak interlayer becomes larger,the axial pressure and the stress of the card stress decrease.Both become larger.When the explosive quantity is 34.3 kg,the maximum axial pressure and tensile stress of the house caused by blasting are-0.98 MPa and 0.882 MPa,respectively,which can ensure the structural safety of the residential building.