爆破荷载作用下埋地钢管的动态响应实验研究

摘要

爆破荷载作用下埋地管道的动态响应问题是城市爆破施工中亟需解决的课题之一,具有重要的理论和现实意义.在理论分析的基础上,通过改变药量、爆心距、管道内压以及爆源埋深中某一参数对埋地无缝钢管进行现场爆破实验,其中药量为50～200 g,每次实验改变25 g共七次;爆心距分别为2.2 m、2.7 m和3.2 m;管道内压分别为0 MPa、0.2 MPa、0.4 MPa和0.6 MPa;爆源埋深分别为0.5 m、1 m、1.5 m和2 m.结果表明:在正常工作压力下钢管内径和管壁厚度的比值越大,管道容许压缩应变值越小;管道应变与比例距离成反比,随着比例距离增大,应变减小;并得出了在实验条件下的应变峰值与爆心距和药量计算公式.%The dynamic response of buried pipeline under blasting load is one of the most important problems in urban blasting construction,which has important theoretical and practical significance.On the basis of theoretical a-nalysis,the field blasting experiment of buried seamless steel pipe was carried out by changing one of the parameters such as the amount of medicine,burst center distance,pipe internal pressure and explosion source depth.The amount of medicine was 50～200 g,and 25 g was changed in each experiment for seven times.The distance to blast source is 2.2m,2.7 m and 3.2 m respectively;the internal pressure of the pipeline is 0 MPa,0.2 MPa,0.4 MPa and 0.6 MPa.The buried depth was 0.5 m,1 m,1.5 m and 2 m.The results show that the larger the ratio of the inner diame-ter and the thickness of pipe wall under normal working pressure,the smaller the allowable compression strain value of the pipe.The strain of the pipeline is inversely proportional to the proportional distance,and the strain decreases as the proportion distance increases.In this paper,the formula of strain peak and distance to blast source and the formu-la of dosage are obtained.