预制桩处理黄河冲积地层中液化效应的试验研究  

Experimental study on liquefaction effect of the Yellow River alluvial strata using precast piles

作　　者：张文斌 李积涛 李艾银 华斌 ZHANG Wen-bin;LI Ji-tao;LI Ai-yin;HUA Bin(Shandong first geological and mineral exploration institute/Shandong provincial bureau of geological and mineral exploration and development,Key laboratory of iron-rich ore searching and resource evaluation,Jinan 250100,Shandong,China;Ocean University of China,Qingdao 266000,Shandong)

机构地区：[1]山东省第一地质矿产勘查院/山东省地质矿产勘查开发局富铁矿找矿与资源评价重点实验室,山东济南250100 [2]中国海洋大学,山东青岛266000

出　　处：《地下水》2024年第1期151-154,共4页Ground water

摘　　要：桩基在地震工况下,其桩身在可液化土层中的侧摩阻力会失效或有所折减。在桩基选型或设计时,应充分考虑液化效应对桩基承载力的影响。预制桩的挤密作用会减少桩间土颗粒的孔隙比,提高地基土的抗震性能,从而增加地震工况下的单桩承载力。黄河冲洪积平原含有大量的粉土、粉砂地层,均存在不同程度的液化效应。本文以聊城某项目开展的实验区进行研究,探讨预制桩的挤密效应对黄河冲洪积地层中液化效应的处理效果。通过预制桩施工前后的标贯对比、黏粒含量的分析以及与规范推荐计算公式的比较,分析评价了预制桩对处理黄河冲洪积地层中液化效应的可行性。Pile foundation under seismic condition,the lateral friction resistance of pile body in liquefied soil will be invalid or reduced.In the selection or design of pile foundation,the influence of liquefaction effect on the bearing capacity of pile foundation should be fully considered.The compaction of precast piles will reduce the void ratio of soil particles between piles and improve the seismic performance of foundation soil,so as to increase the bearing capacity of single pile under seismic conditions.The alluvial plain of the Yellow River contains a large number of silt and silt strata,which have different degrees of liquefaction effect.Based on the experimental area of a project in Liaocheng,this paper discusses the treatment effect of the compaction effect of precast piles on the liquefaction effect in the alluvial strata of the Yellow River.Through the comparison of standard penetration before and after the construction of precast pile,the analysis of clay content and the comparison with the calculation formula recommended by the code,the feasibility of precast pile in treating the liquefaction effect in the alluvial stratum of the Yellow River is analyzed and evaluated.

关 键 词：预制桩 液化效应 挤密作用 标贯试验 

分 类 号：TU473.13[建筑科学—结构工程]