沟槽对建筑物减震作用的动光弹研究

DYNAMIC PHOTOELASTIC STUDIES OF THE VIBRATION DAMPING BY A SLOT NEAR A STRUCTURE

本文用动光弹方法实验研究了沟槽对爆炸地震波的衰减作用和对建筑物的保护作用分析表明:在模型实验条件下,当槽深大于20mm时,地震波的大部分能量被槽挡住,地震波对槽后的建筑物影响甚小,当槽深小于15mm时,槽与建筑物之间应力场较强,临界深度在15～20mm左右,这一深度大约是爆生瑞利波波峰深度的3～4倍。槽宽度对地震波衰减作用不大。

The vibration damping by a slot near a structure on the seismic waves generated explosively at the Tree surface was studied by dynamic photoelasticity in this paper. I he analysed results indicated that under the conditions of the model test the slot can intercept a great part of energy in seismic waves and the seismic waves have a little effect on the structure near the slot as the depth of the slot is more than 20mm. the stress fields be-tween the slot and the structure are strong as the depth of the slot is less than 15mm. The critical depth of the slot is about 15-20mm which is about 34 times the distance between the surface and the subsurface peak of the R-wave. The width of the slot has no serious effect on the attenuation of the seismic waves.