洞径对地下洞室的动力应力集中系数和振动加速度影响研究

Research on the Influence of Radius on Dynamic Stress Concentration Factor and Vibration Acceleration of Underground Openings

参考模型试验,利用波的函数展开法推导了平面P波作用下不规则洞室的应力和位移表达式,并以一深埋直墙圆拱形洞室为例得到:除了背爆侧局部范围之外,洞室的洞径越大,动应力集中系数越小;当入射角为270°时,在迎爆侧,洞室洞径越大,径向振动加速度和切向加速度越大,在背爆侧,洞室洞径越大,径向振动加速度和切向加速度越小。并且洞径对应力集中系数的影响程度比对振动加速度的影响程度大。

Based on model tests,the wave function expansion method was used to derive expressions of stress and displacement of the irregular underground opening under P-wave.Taking straight-wall and arched underground opening as an example,the results show that the influence of radius on vibration acceleration is larger than that of radius on dynamic stress concentration factor.Except for local range of back-blast side,with the increase of radius of underground openings,the dynamic stress concentration factor is decreasing.When the angle of incidence is 270°,with the increase of radius of underground openings,the radial acceleration and tangential acceleration of face-blast side are increasing,but the radial acceleration and tangential acceleration of face-blast side are decreasing.