【摘要】：為更有效地進(jìn)行薄基巖頂板條件下隧道施工安全控制,以某高速公路隧道為工程背景,運(yùn)用數(shù)值模擬的方法,分別研究不同頂板厚度下隧道爆破施工引起的圍巖振速分布特征及其對(duì)圍巖的損傷情況,并進(jìn)行圍巖穩(wěn)定性分析。結(jié)果表明:1)當(dāng)頂板厚度在5 m及以上時(shí),圍巖是穩(wěn)定的;2)當(dāng)頂板厚度為3 m時(shí),最危險(xiǎn)橫斷面上基巖頂板內(nèi)開始產(chǎn)生嚴(yán)重的拉伸裂縫及一些徑向裂縫,將形成超挖;3)當(dāng)頂板厚度≤2 m時(shí),徑向裂縫貫穿頂板巖體,圍巖穩(wěn)定性較差,在掌子面后1 m內(nèi)可能發(fā)生塌落、掉塊等事故。
[Abstract]:In order to control the safety of tunnel construction under the condition of thin bedrock roof more effectively, the vibration velocity distribution characteristics and damage to surrounding rock caused by blasting under different roof thickness are studied by numerical simulation method, and the stability of surrounding rock is analyzed. The results show that:1)when the thickness of the roof is 5m or above, the surrounding rock is stable;2)When the thickness of the roof is 3m, serious tensile cracks and some radial cracks in the bedrock roof on the most dangerous cross-section will form over-excavation;3)When the thickness of the roof is鈮，

本文編號(hào)：2499408