【摘要】：隧道洞口段往往受到淺埋、偏壓等復(fù)雜地形地質(zhì)條件的影響,巖石較破碎,圍巖不穩(wěn)定,其爆破施工是隧道施工的重點(diǎn)、難點(diǎn)。新建京張高鐵草帽山隧道進(jìn)口洞身106 m長范圍為淺埋偏壓段,圍巖級別為Ⅴ級。在進(jìn)口段進(jìn)行了17次有效的爆破振動速度現(xiàn)場監(jiān)測,通過線性擬合得到合理的薩道夫斯基公式中的系數(shù),計(jì)算出爆破施工時(shí)的最大單響藥量為54.07 kg。對實(shí)測數(shù)據(jù)進(jìn)行傅里葉變換得到爆破振動的頻譜曲線,從中可知:爆破地震波主頻率隨著爆心距的增大而減小,隨著單響最大藥量的增大而減小。為了避免出現(xiàn)共振現(xiàn)象,建議爆破施工時(shí)避免多段雷管同時(shí)起爆,并嚴(yán)格控制最大單響藥量。
[Abstract]:The tunnel entrance section is often affected by the complex topographical and geological conditions such as shallow burial, partial pressure and so on. The rock is relatively broken and the surrounding rock is unstable. The blasting construction of the tunnel is the key and difficult point of the tunnel construction. The new Caomaomaishan Tunnel of Beijing-Zhang High Speed Railway has a 106m long range of shallow burying partial pressure, and the surrounding rock grade is grade 鈪，

本文編號：2216450