某深基坑土钉墙支护位移控制的设计与观测

The Displacement-control Design and Monitoring of a Soil-nailed Wall

针对一开挖深度为12.6m深基坑土钉墙锚喷支护过程中的位移问题,本文在按稳定控制进行设计的基础上,采用FLAC3D三维快速拉格朗日差分程序,基于莫尔-库伦破坏准则和理想弹塑性模型,对基坑外土体的下沉和墙后土体的水平位移采用数值计算方法进行了变形控制设计,并对基坑开挖边坡水平位移和沉降量进行了现场观测。结果表明,现场水平位移和沉降量监测值与设计值较为接近。本文进行的土钉墙位移控制设计方法可为相关的深基坑支护工程提供参考。

To deal with the displacement problem in a soil-nailing-wall of a 12.6m excavating deep foundation pit, displacement-control design of vertical settlement and lateral displacement behind the retaining wall were conducted on the basis of stability-control design. The analysis is conducted applying Three Dimensional Fast Lagrangian Analysis of Continua （FLAC3D） and Mohr-Coulomb failure criteria and ideal elastoplastic model. Field observations of lateral and vertical displacement had been carried out. The results show that in situ monitoring values of lateral displacement and settlement are in good accordance with the designed ones. This displacement-control design of soil nailing wall in this paper provides valuable mathodology for other relevant engineering practices in deep excavation retaining.