| 李蕾.小断面引水隧洞初期支护开裂变形影响因素及施工技术优化研究[J].矿产勘查,2023,14(10):1999-2005 |
| 小断面引水隧洞初期支护开裂变形影响因素及施工技术优化研究 |
| Study on influencing factors of initial support cracking deformation of small section headrace tunnel and optimization of construction technology |
| 投稿时间：2022-12-06 修订日期：2023-01-24 |
| DOI：10.20008/j.kckc.202310025 |
| 中文关键词: 小断面引水隧洞 初期支护 开裂变形 施工技术优化 |
| 英文关键词: small section headrace tunnel initial support cracking and deformation construction technology optimization |
| 基金项目:本文受陕西铁路工程职业技术学院科研项目“渭北流域径流序列模拟研究课题”（KY2021-51）资助。 |
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| 中文摘要: |
| 由于小断面引水隧洞开挖和初期支护施工过程易出现开裂变形，可能会引发隧洞结构的破坏，导致隧洞失稳甚至崩塌，给工人和设备带来危险，对周围环境和人员造成严重影响。为确保隧洞施工和使用安全，减少初期支护的开裂变形，降低后期维护和修复的成本，提高工程的经济效益，研究小断面引水隧洞初期支护开裂变形影响因素及施工技术优化方法。采用三台阶开挖法对某地引黄工程交汾灵支线小断面引水隧洞进行初期支护施工，初支的衬砌材料为C25混凝土与H230格栅钢架。按照隧洞初期支护情况，构建初期支护载荷-结构模型，依次输入不同侧压力系数，分析不同侧压力对初期支护造成的开裂变形影响。经试验验证：当侧压力系数为1.0时，水平、竖向位移值最小；当初期支护每次喷射混凝土厚度更均匀时，隧洞的安全系数更高；仰拱在闭合状态下会减少隧洞不同初支位置的位移。针对初支存在的问题，通过加固支撑、围岩径向注浆等方式进行优化，可使初期支护更加稳定，研究结果能够减少初期支护的开裂变形，降低后期维护和修复的成本，提高工程的经济效益。 |
| 英文摘要: |
| Due to the easy occurrence of cracking and deformation during the excavation and initial support construction of small cross-section diversion tunnels， it may cause damage to the tunnel structure， leading to instability and even collapse of the tunnel， posing a danger to workers and equipment， and causing serious impacts on the surrounding environment and personnel. To ensure the safety of tunnel construction and use， reduce the cracking and deformation of initial support， reduce the cost of later maintenance and repair， and improve the economic benefits of the project， the influencing factors of the initial support crack and deformation of small section headrace tunnel and the optimization method of construction technology are studied. The three bench excavation method is used to carry out the initial support construction for the small section diversion tunnel of Jiaofenling Branch of the Yellow River Diversion Project. The lining materials for the initial support are C25 concrete and H230 grid steel frame. According to the initial support of the tunnel， the load structure model of the initial support is built， and different lateral pressure coefficients are input in turn to analyze the impact of different lateral pressures on the cracking deformation of the initial support. The test shows that when the lateral pressure coefficient is 1.0， the horizontal and vertical displacement values are the minimum； when the thickness of shotcrete for initial support is more uniform each time， the safety factor of tunnel is higher； when the inverted arch is closed， it will reduce the displacement of different initial support positions of the tunnel. In view of the problems existing in the initial support， the initial support can be more stable by optimizing the reinforcement support and surrounding rock radial grouting， it can reduce the cracking and deformation of the initial support， reduce the cost of later maintenance and repair， and improve the economic benefits of the project. |
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