条形药包在隧道爆破中产生的应力场的实测分析

基于条形药包的爆破特性，针对隧道爆破的装药形式，把隧道爆破简化成几个条形药包的微差爆破，在隧道爆破区域的径向应力波为柱形，隧道掘进的轴向应力波为几个并列半圆形。应力波强度分布很不均匀，爆破区域的径向应力强度最大，向爆区端部延伸径向应力强度逐渐减小。进入爆区端部后，应力强度减小更明显。随着与爆区轴线夹角的减小，端部应力强度再次减小，爆区端部轴线方向应力强度最小。

Analysis of in-situ measurement results of tunnel’s stress field induced by linear charge explosion

Based on stress and vibration fields resulted from linear charge explosion, according to charge characterizatic used in tunnel blasting, blastholes in tunnel face are considered as linear charges blasted in millisecond blasting methods, shape of stress and vibration fields in radial of blasting zone is shape of pillar; and shape of stress and vibration fields in axis of tunnel is combination of several hemicycles. The intensity of stress field is not very well-proportioned; intensity of stress field in in radial of blasting zone is maximal; intensity of stress field from radial to axial is gradually diminishing; intensity of stress in the port of blasting zone is evidently diminishing; intensity of stress in axis in the port of blasting zone is minimal.