山东大学学报 (工学版) ›› 2021, Vol. 51 ›› Issue (4): 61-70.doi: 10.6040/j.issn.1672-3961.0.2020.523
• • 上一篇
卢光兆1,周博1,徐锋1,2,上官伟1,王刚2,张书博1*
LU Guangzhao1, ZHOU Bo1, XU Feng1,2, SHANGGUAN Wei1, WANG Gang2, ZHANG Shubo1*
摘要: 针对破碎岩体浅埋偏压隧道围岩稳定性问题和进洞工法的取选,选用ABAQUS有限元软件对广西岭顶隧道分别采用三层台阶法、中隔墙法和双侧壁导坑法施工进行数值模拟研究,分析不同施工方法下围岩及支护结构的应力、应变及塑性区分布变化等情况。结果表明:由于隧道存在明显的浅埋和偏压作用,进洞适宜采用中隔墙法和双侧壁导坑法施工作业,能较好地保证隧道的稳定性。在该工程条件下,中隔墙法对拱顶和地表的沉降变形控制较好,而双侧壁导坑法对拱腰处的变形控制更佳。中隔墙法支护结构的内力和弯矩主要集中在拱顶左侧。双侧壁导坑法支护结构的内力和弯矩左右两侧对称分布,隧道拱顶正上方锚杆受力较小。进洞开挖步距不宜过大,确定每次开挖在2 m以内即可。
中图分类号:
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