| 浅埋富含水砂层盾构下穿敏感性建筑水平冻结+短钢箱接收技术? |
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| 引用本文： | 马俊,杨平,刘增光,陈亮.浅埋富含水砂层盾构下穿敏感性建筑水平冻结+短钢箱接收技术?[J].防灾减灾工程学报,2020(2):260-267. |
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| 作者姓名： | 马俊 杨平 刘增光 陈亮 |
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| 作者单位： | 南京林业大学土木工程学院，江苏 南京 210037;常州市轨道交通有限公司，江苏 常州 213022 |
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| 基金项目： | 国家自然科学基金项目（51478226）、江苏高校优势学科建设工程资助项目（PAPD）、常州市轨道交通科研项目（DG-DC-16006）资助 |
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| 摘 要： | 盾构始发与接收是盾构法隧道施工的关键风险点,以常州地铁1号线一期工程博爱路站-常州火车站区间下行线盾构接收工程为例,隧道下穿常州火车站站厅,隧道顶部距地下大厅结构底板仅3.75 m,受地面条件限制采用水平冻结加固方式。通过对冻结温度场、卸压孔压力及车站底板隆起进行跟踪监测与分析,结果表明:受地下水影响温度下降缓慢,车站底板因冻胀隆起较大,最大隆起处位于隧道端头中心线处约为46 mm,且底板隆起值与测点温度的变化密切相关;为防止温度低引起冻胀过大造成上部结构破坏,采取在冻结壁外围适度卸水进行卸压措施;在冻结壁交圈但厚度尚未完全达到冻结设计要求情况下,提出加装短钢箱装置进行盾构接收。实践表明,适度卸压水平冻结+加装短钢箱接收方式密封止水效果良好,安全可靠,可为今后类似工程提供可行技术。
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| 关 键 词： | 水平冻结 冻结温度场 隆起监测 加装短钢箱 盾构接收 |
Horizontal Freezing and Short Steel Box Receiving Technology for Shield Beneath Sensitive Building under Shallow Buried Water-rich Sand Layer |
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| MA Jun,YANG Ping,LIU Zengguang,CHEN Liang.Horizontal Freezing and Short Steel Box Receiving Technology for Shield Beneath Sensitive Building under Shallow Buried Water-rich Sand Layer[J].Journal of Disaster Prevent and Mitigation Eng,2020(2):260-267. |
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| Authors: | MA Jun YANG Ping LIU Zengguang CHEN Liang |
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| Affiliation: | School of Civil Engineering, Nanjing Forestry University, Nanjing 210037 , China;Changzhou Urban Rail Transit Construction Ltd, Changzhou 213022 , China |
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| Abstract: | Shield launching and receiving is the key risk point in shield tunnel construction. This paper took the shield receiving project in the downlink line of Changzhou Metro Line 1 of Boai Road station to Changzhou Railway Station as an example. The tunnel is underneath the Changzhou Railway Station and the top of the tunnel is only 3.75 m from the structure floor of the underground hall. Restricted by ground conditions, horizontal freezing method was adopted for the shield receiving construction. The freezing temperature field, the pressure in pressure relief holes and the uplift of the station floor were monitored and analyzed. The results show that the temperature drops slowly and the floor heave is closely related to the change of the temperature at the measuring point. The uplift of the station floor is larger with frost heave. The maximum uplift value is about 46 mm which is located at the center line of tunnel entrance. In order to prevent the overlarge frost heave caused by the low temperature and the damage of the superstructure, a pressure relief measure was adopted by appropriate water discharge around the frozen wall. The short steel box device was installed to receive the shield when the connected freezing wall has not fully met the requirements of the freezing design. The practice shows that the sealing effect of moderate pressure relief horizontal freezing reinforcement and installation short steel box is good. The engineering is safe and reliable. The presented method will provide a feasible technology for similar projects in the future. |
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