红黏土隧道拱底基础变形控制技术研究

Research on Foundation Deformation Control Technology of Red Clay Tunnel Foundation

为研究红黏土隧道地基的长期变形,保证施工安全和进度,结合某大断面红黏土隧道实测数据和数值模拟,探讨红黏土隧道地基固结机制。结果表明,红黏土由于其特殊的微观结构,游离氧化物带来的强大结构连接力导致在实际工程性质中表现出超固结性,在隧道开挖过程中,根据红黏土压缩沉降特性进行地基加固,经高压旋喷桩加固后,30m沉降范围内,地基中心最大沉降为7.83mm,未出现较大不均匀沉降,研究结果可为红黏土隧道地基处理方式的优化及长期变形研究提供参考。

In order to study on the long-term deformation of the red clay tunnel foundation,ensure the safety and progress of the construction,the consolidation mechanism of the red clay tunnel foundation is discussed in combination with the measured data and numerical simulation of a large section of red clay tunnel. The results show that the strong structural connection force caused by the free oxide caused by the special microstructure of the red clay leads to the superconsolidation of the actual engineering properties,in the process of tunnel excavation,the foundation is strengthened according to the compression and settlement characteristics of red clay. After the reinforcement of the high pressure rotary jet pile,the maximum settlement of the foundation center is 7. 83 mm within the range of 30 m settlement,and there is no larger uneven settlement.The research results can be provided for the optimization of the foundation treatment mode and the long-term deformation study of the red clay tunnel.