摘要
为掌握连拱式基坑支护结构的几何设计参数对支护效果的影响,采用数值分析的方法,建立多跨三维基坑模型,并以坑后土体塑性区的分布为研究指标。结果表明,单拱跨度增加,坑后塑性区范围显著增加,受其影响较显著;拱壁厚度增加,坑后塑性区减小,受其影响较小;结构矢跨比的增加,坑后塑性区的扩展深度逐渐减小,水平扩展长度增加;基坑深度的增加,坑后塑性区范围逐渐变大,并且嵌固深度比不变,塑性区扩展角基本不变;嵌固深度比增加,坑后塑性区的扩展范围减小;拱脚直径增加,坑后塑性区范围明显减小。
In order to understand the impact of geometric design parameters on multi-arch supporting structure of foundation excavation, numerical analysis method was used, multi-span three-dimensional models were established, and plastic zone distribution was adopted as the research index. The results show that the scope of plastic zone is increasing with the arch span increasing, and the effect of arch span is significant. The scope of plastic zone is decreasing with the thickness of arch buttress increasing, but the effect is not significant. The depth of plastic zone is decreasing and the horizontal length of plastic is increasing with the rise span ratio increasing. The scope of plastic zone is increasing with the depth of foundation excavation increasing, and if the embedded depth ratio is not changed, the extension angle of plastic zone is almost unchanged. The scope of plastic zone is decreasing with the embedded depth ratio increasing. The scope of plastic zone is decreasing with the diameter of skewback pile increasing.
出处
《施工技术》
CAS
北大核心
2015年第19期81-86,共6页
Construction Technology
关键词
基坑
支护
连拱
塑性区
数值分析
foundation excavation
supports
multi-arch
plastic zone
numerical analysis
