摘要
某地铁的盾构出洞位置处采用了深层搅拌桩进行加固。从竖直和水平方向对成桩质量进行了评估,结果表明质量不合格,不能满足盾构出洞的技术要求。为保证施工安全,又分别利用液氮和盐水冻结对左、右线隧道的端头井地层进行了加固补强。实践表明两种方法都能满足盾构出洞的技术要求。经对比分析认为,液氮和盐水冻结法比搅拌桩更适合应用于粉细砂地层的盾构端头井加固。
The cement mixing method is used to reinforce the shield launching shaft in fine sand layer, but the quality is not good enough to meet the requirements of shield launching. In order to ensure the safety of construction, liquid nitrogen and brine freezing are used respectively to reinforce the shield launching shaft, and the result shows that the quality could meet the needs of shield launching, while the liquid nitrogen and brine freezing are more suitable than cement mixing method to reinforce the shield launching shaft in fine sand layer.
出处
《城市轨道交通研究》
北大核心
2011年第5期61-64,共4页
Urban Mass Transit
关键词
地铁
盾构端头井加固
粉细砂地层
搅拌桩
液氮冻结
盐水冻结
metro
shield launching shaft reinforcement
fine sand layer
cement mixing piles
liquid nitrogen freezing
brine freezing
