深基坑支护结构预警技术的探讨

Discussion of Warning Technology of Deep Pit Supporting Structures

围护结构对基坑起着至关重要的作用,其安全性直接关系基坑的风险。然而,目前限于技术发展,以及岩土工程环境的区域性,报警值无法统一,现行有关基坑支护设计规范一般只给出一些原则性的指导意见或使用总位移量作为变形监控预警指标。本文试图通过三次B样条曲线拟合的数学方法将围护结构水平位移的报警转化为弯矩的报警,通过计算出的弯矩值与设计许可弯矩及规范允许的桩体极限弯矩对比,判断围护结构是否安全。

Supporting structure plays a crucial part in deep pit construction, and its security directly influences the risks of the foundation pit. However, limited by the technology and regional environment, the value of alarm could not be unity. The existing criteria for design protection technology of foundation pit only provide some provisions of guiding principles or applying the total displacement to deformation monitor. This paper attempts to use curve fit by cubic B-spline curve to convert the alarm of the lateral displacement to the bending moment, which is compared with the permission of design and the limit of criterion, so as to can determine whether the supporting structure is secure or not.