永勐高速帮福隧道三维地应力分布规律研究  

Study on three-dimensional ground stress distribution in Bangfu Tunnel of Yongmeng Expressway

作　　者：张向阳 吴勇[1,2,3] 李明枢 佟欣燃 孔德彪 Zhang Xiangyang;Wu Yong;Li Mingshu;Tong Xinran;Kong Debiao(Yunnan Institute Building Research Co.,Ltd.,Kunming 650223,China;Yunnan Geotechnical Engineering Technology Research Center,Kunming 650223,China;Yunnan Key Laboratory of Building Structure and New Materials,Kunming 650223,China)

机构地区：[1]云南省建筑科学研究院有限公司,昆明650223 [2]云南省岩土工程技术研究中心,昆明650223 [3]云南省建筑结构与新材料企业重点实验室,昆明650223

出　　处：《工程勘察》2025年第4期17-23,共7页Geotechnical Investigation & Surveying

基　　金：云南省科技厅科技计划面上项目(202301AT070481)。

摘　　要：通过应力解除法对永勐高速帮福隧道进行三维地应力测量,分析隧址区地应力分布规律,得出帮福隧道存在的应力较高,最大主应力σ_1值为34.62~38.73MPa,且地应力呈现出随埋深增大而增大的趋势,最大主应力方向约为WS225°;最大水平主应力与垂直应力的比值(侧压力系数)为1.80~2.02,最大水平主应力和最小水平主应力比值为2.17~2.46;隧道岩爆以强烈—极强烈岩爆为主,且埋深越大,围岩越易发生岩爆。研究成果可以为永勐高速帮福隧道的设计和施工提供科学的指导和依据,也可为研究该地区应力场分布规律提供数据参考。The three-dimensional ground stress measurement for Bangfu Tunnel of Yongmeng Expressway is carried out by using stress relief method,and the distribution law of in-situ stress in the tunnel site is analyzed.The results show that there is a high stress in Bangfu Tunnel,with the maximum principal stressσ1 ranging from 34.62MPa to 38.73MPa,and the in-situ stress tends to increase with the buried depth,and the maximum principal stress direction is about WS225°.The ratio of maximum horizontal principal stress to vertical stress(lateral pressure coefficient)is 1.80~2.02,and the ratio of maximum horizontal principal stress to minimum horizontal principal stress is 2.17~2.46.The rock burst of the tunnel is mainly strong to extremely strong rock burst,and the greater the buried depth,the more prone the rock burst of surrounding rock.The study results can provide scientific guidance and basis for the design and construction of the tunnel,and also provide data reference for the study on the distribution of stress field in this area.

关 键 词：三维地应力 帮福隧道 岩爆 地质构造 

分 类 号：TU459[建筑科学—岩土工程] TD326[建筑科学—土工工程]