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

作　　者：陈震 王国富 路林海 王渭明 王丹 CHEN Zhen;WANG Guo-fu;LU Lin-hai;WANG Wei-ming;WANG Dan(College of Civil Engineering&Architecture,Shandong University of Science and Technology,Qingdao 266590,China;Ji’nan Rail Transit Group Co.,Ltd.,Ji’nan 250101,China)

机构地区：[1]山东科技大学土木工程与建筑学院,山东青岛266590 [2]济南轨道交通集团有限公司,济南250101

出　　处：《长江科学院院报》2018年第4期97-103,共7页Journal of Changjiang River Scientific Research Institute

基　　金：山东省自然科学基金项目(ZR2017MEE065);住房城乡建设部研究开发项目(2016-K4-053);住房城乡建设部科技示范工程项目(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);济南市优秀创新团队项目(济政字[2016]40号)

摘　　要：济南西北部为黄河下游冲积黏-砂互层地质结构,深基坑稳定性受地层条件影响较大,土层质量直接影响围护桩插入比的取值。以山东省会文化艺术中心深基坑为工程背景,通过理论计算和数值模拟对桩体在不同插入比下的稳定性进行分析。研究发现:土层质量参数与插入比存在线性关系,可引入土压力折减系数计算围护桩入土深度;通过实际工程数值分析得到最佳插入比为0.55;根据现场0.58插入比实测数据对数值模拟进行验证,结果发现桩顶侧向位移最大值为0.05%H(H为基坑深度),沉降最大值为0.04%H,基坑结构足够稳定且有相当大的安全储备,因此,可减小插入比以降低工程造价,缩短施工工期,实现工程的绿色建设。研究成果对济南特殊的黄河冲积层地区深基坑建设具有借鉴意义。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 

分 类 号：TU433[建筑科学—岩土工程]