山东大学学报 (工学版) ›› 2024, Vol. 54 ›› Issue (3): 70-80.doi: 10.6040/j.issn.1672-3961.0.2023.024
• 土木工程 • 上一篇
李连祥1,2,韩志霄1,2,张潇潇3,陈家财4
LI Lianxiang1,2, HAN Zhixiao1,2, ZHANG Xiaoxiao3, CHEN Jiacai4
摘要： 为了探究土岩双元基坑的破坏模式及判定标准,依托具体案例,采用PLAXIS 3D有限元数值模拟软件,利用强度折减法,得到下卧岩体稳定时不同上覆土层厚度的4种基坑破坏模式演变规律和不同下卧岩体的基坑破坏模式判定标准。利用条分法推导出圆弧、圆弧-平面、切面和滑切破坏模式整体稳定性统一解析解,针对切面和滑切破坏模式,得到不同下卧岩体发生破坏时的临界上覆土层厚度,推导出保持岩体切角稳定的最小支护作用力计算公式。结合多个基坑工程案例进行验证,结果表明:土岩双元基坑的破坏模式有别于土体基坑,应充分考虑岩体的强度和稳定性。下卧岩体稳定时,随上覆土层厚度增大,土岩双元基坑的破坏模式逐渐从圆弧破坏向圆弧-平面、切面和滑切破坏过渡转变,破坏模式判定标准及稳定性解析解具有合理性研究结果,可以为土岩双元基坑合理支护提供支持和参考。
中图分类号:
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