摘要
广州市轨道交通四号线南延段[施工3标]土建工程塘坑站~大涌站盾构区间采用复合式土压平衡盾构机施工。目前,关于盾构掘进比较成熟的工艺仅限于单一地层,而类似于本标段有关上软下硬地层条件下盾构掘进研究相对滞后。国内、外许多在上软下硬地层条件下盾构掘进时出现不同程度的喷涌、刀盘结泥饼、刀具损坏甚至地表坍塌等现象。经本标段的现场实践,在能实现半仓气压法掘进的情况下,采用该方法进行施工,能有效地降低刀盘扭矩和刀具损坏的速度,减少喷涌和地表坍塌的风险,极大地提高掘进效率。
Composite earth pressure balance shield machine is adopted in the interval construction of Tangkeng Station to Dayong Station in the south extension [ construction bid 3 ] civil engineering of Guangzhou Metro Line 4. At present, a shield tunneling is relatively mature technology only limited to single stratum, while the research on shield tunneling in up- per-soft lower-hard layer similar to this section is relatively lagging behind. Different degrees of spewing, mud caking on cutter head, tool damage and even surface collapse appeared in domestic and abroad when shield tunneling in upper-soft lower-hard layers. Through the field practice of this bid section, the half chamber pressure method was used under the con- dition that the tunneling could be realized, which would effectively reduce the torque of the cutter head and the speed of the cutter damage, decrease the risk of spewing and surface collapse, and greatly improve the efficiency of tunneling.
出处
《铁道建筑技术》
2016年第6期40-42,共3页
Railway Construction Technology
基金
中铁十九局集团有限公司科技发展计划项目(15-14B)
关键词
盾构掘进模式
上软下硬地层
喷涌
泥饼
刀具损坏
地表坍塌
半仓气压法
shield tunneling mode
upper-soft lower-hard layer
spewing
mud cake
tool damage
surface collapse
halfchamber pressure method
