摘要
为探讨在同等地质参数下隧洞开挖初期采用不同的支护类型对隧洞稳定性的影响,结合夏特水电站工程实例,通过现场原位试验取得围岩参数,利用有限元强度折减法,通过有限元模拟软件定量分析了Ⅲ类、Ⅳ类、Ⅴ类围岩在开挖初期裸洞、混凝土喷护、系统锚杆等支护方式时隧洞稳定性的变化规律。结果表明,施加锚杆支护相较于无支护的开挖方式,隧洞的安全系数提高了5%~15%;圆形隧洞的塑性区发展都是从隧洞两侧开始,可对两侧增加支护以提高围岩的稳定性。
In order to explore the influence of different support types on the stability of tunnel at the initial stage of tunnel excavation under the same geological parameters,combined with the project of Xiate Hydropower Station,the parameters of surrounding rock are obtained through field in-situ test,and the finite element simulation software based on the finite element strength reduction method is used to quantitatively analyze the stability variation law of tunnel with Type III,IV and V surrounding rocks at the initial stage of excavation under different support modes of no-support,concrete shotcrete and anchor rod respectively.The results show that the safety factor of the tunnel is increased by 5%-15%compared with that without support,and as the development of the plastic zone of circular tunnel starts from both sides of the tunnel,so the support should be added to both sides to improve the stability of surrounding rock.
作者
胡睿
严新军
欧阳君
田崇磊
HU Rui;YAN Xinjun;OUYANG Jun;TIAN Chonglei(College of Water Conservancy and Civil Engineering,Xinjiang Agricultural University,Urumqi 830052,Xinjiang,China;Hunan Water Conservancy and Hydropower Survey and Design Research Institute,Changsha 410007,Hunan,China)
出处
《水力发电》
2021年第1期34-38,126,共6页
Water Power
基金
国家自然科学基金资助项目(51968071)
2020年自治区研究生科研创新项目(XJ2020G165)。
关键词
隧洞工程
初期支护
稳定性分析
仿真计算
现场原位试验
tunnel engineering
initial support
stability analysis
simulation calculation
field in-situ test
