以色列地铁粉砂地层盾构连续穿越河道和铁路施工技术

Construction Technology of Metro Shield Continuously Crossing underneath Riverway and Railway in Silt Layer in Israel

为解决土压平衡盾构连续下穿河道和铁路的施工技术难题,结合以色列TelAviv地铁红线盾构隧道施工实例,研究土压平衡盾构在浅埋粉砂层中2次连续切削钢筋混凝土桩基并穿越河道、运营铁路施工控制技术。综合采用深层旋喷桩加固技术、建(构)筑物自动化监测系统、盾构切削钢筋混凝土桩基试验、盾构掘进施工沉降控制施工技术,顺利实现2台盾构安全穿越河道、铁路、桩基等危险区域。通过实时监测数据对沉降、盾构切割桩基试验数据、近距离下穿河道和铁路整个过程进行调查、研究与分析,得出以下结论:1)提出盾构下穿河道和运营铁路时沉降控制的有效技术措施;2)总结形成一套土压平衡盾构在辅助工法配合下穿越河道、铁路等危险建(构)筑物工法,拓宽土压平衡盾构的使用范围;3)验证盾构不同刀具配置与有效切割钢筋混凝土桩基的关系,为类似工程提供技术支撑和经验。

The construction and control technology of metro earth pressure balanced(EPB) shield continuously cutting reinforced concrete pile foundations and crossing riverway and railway in silt layer is studied by taking Red Line shield tunnel of Tel Aviv Metro in Israel for example. A series of technologies, i. e. deep jet pile reinforcement technology, automatic monitoring system for buildings, shield cutting reinforced concrete pile foundation test and shield tunneling construction settlement control technology, are adopted, and the safe riverway, railway, pile foundation crossing of the 2 shields has been successfully realized. The settlement, test data of shield cutting pile foundations, closely crossing underneath riverway and railway are analyzed according to monitoring data. Some conclusions are drawn as follows:(1) Effective technical measures for settlement control of shield tunneling through riverway and railway in operation are put forward.(2) A set of construction methods for EPB shield crossing underneath dangerous structures such as riverway and railway is formed to broaden the application scope of EPB shield.(3) The relationship between different tool configurations of shield and effective cutting of reinforced concrete pile foundation is verified. The results can provide technical support and experience for similar projects in the future.