薄基岩顶板隧道爆破施工围岩稳定性分析
发布时间：2019-06-14 13:03
【摘要】：为更有效地进行薄基岩顶板条件下隧道施工安全控制,以某高速公路隧道为工程背景,运用数值模拟的方法,分别研究不同顶板厚度下隧道爆破施工引起的围岩振速分布特征及其对围岩的损伤情况,并进行围岩稳定性分析。结果表明:1)当顶板厚度在5 m及以上时,围岩是稳定的;2)当顶板厚度为3 m时,最危险横断面上基岩顶板内开始产生严重的拉伸裂缝及一些径向裂缝,将形成超挖;3)当顶板厚度≤2 m时,径向裂缝贯穿顶板岩体,围岩稳定性较差,在掌子面后1 m内可能发生塌落、掉块等事故。
[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，
本文编号：2499408
[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，
本文编号：2499408
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