长江科学院院报2018，Vol.35Issue(4)：97-103,7.DOI:10.11988/ckyyb.20161140
黄河冲积互层深基坑围护桩插入比优化分析
Optimizing Insertion Ratio of Supporting Pile in Deep Foundation Pit in Yellow River Alluvium
摘要
Abstract
The stability of excavation pit in northwest Ji'nan,which locates in alluvial clayey-sand interbedded zone of downstream Yellow River,is greatly affected by soil strata.The pile insertion ratio (defined as the pile length above excavation bottom to the length below excavation bottom) is directly affected by soil strata quality.In this article,the stability of support piles with different insertion ratios are analyzed through theoretical calculation and numerical simulation.The excavation pit at the Shandong Provincial Cultural and Arts Center is taken as engineering background.Research results reveal that parameters of soil strata quality are in linear relations with insertion ratio.By introducing the earth pressure reduction coefficient into the calculation of embedded depth of pile,we found that the optimum insertion ratio is 0.55.According to measured insertion ratio 0.58,the numerical result is verified.The maximum lateral displacement of pile top is 0.05％ of the pit depth (H),and maximum settlement 0.04％H,indicating that the excavation structure is stable enough with sufficient safety reserve.Therefore,the insertion ratio in the study case can be reduced to cut project cost and shorten construction period.The research results are of reference value for excavation pit construction in special alluvial areas of the Yellow River.关键词
深基坑/围护桩/黄河冲积层/结构变形/插入比/优化分析Key words
deep foundation/supporting pile/the Yellow River alluvium/structural deformation/insertion ratio/optimization analysis分类
建筑与水利引用本文复制引用
陈震,王国富,路林海,王渭明,王丹..黄河冲积互层深基坑围护桩插入比优化分析[J].长江科学院院报,2018,35(4):97-103,7.基金项目
山东省自然科学基金项目(ZR2017MEE065) （ZR2017MEE065）
住房城乡建设部研究开发项目(2016-K4-053) （2016-K4-053）
住房城乡建设部科技示范工程项目(2016-S3-008) （2016-S3-008）
山东省住房和城乡建设厅科学技术项目(2016-KY026,2017-K2-011,2017-K2-012,2017-K4-009,FW-20161001:A7) （2016-KY026,2017-K2-011,2017-K2-012,2017-K4-009,FW-20161001:A7）
济南市优秀创新团队项目(济政字[2016]40号) （济政字[2016]40号）
