新型混凝土桩基承载特性研究  

Research on Bearing Characteristics of New Concrete Pile Foundation

作　　者：朱小伟 丁辰 薛凯喜[1] 易光胜 周朝慧 韩凯敏 李明吉 ZHU Xiaowei;DING Chen;XUE Kaixi;YI Guangsheng;ZHOU Chaohui;HAN Kaimin;LI Mingji(East China University of Technology,School of Civil and Architecture Engineering,Nanchang 330013,China;College of Civil and Transportation Engineering,Shenzhen University,Shenzhen 518060,China;Department of Building Engineering,Guangzhou City Construction College,Guangzhou 510925,China;College of Civil and Transportation Engineering,Hohai University,Nanjing 210098,China;Geotechnical Engineering Department,Nanjing Hydraulic Research Institute,Nanjing 210024,China)

机构地区：[1]东华理工大学土木与建筑工程学院,南昌330013 [2]深圳大学土木与交通工程学院,广东深圳518060 [3]广州城建职业学院建筑工程学院,广州510925 [4]河海大学土木与交通学院,南京210098 [5]南京水利科学研究院岩土工程研究所,南京210024

出　　处：《森林工程》2025年第2期379-392,共14页Forest Engineering

基　　金：国家自然科学基金项目(42167024);江西省自然科学基金项目(20192BAB206045);江西省教育厅科技项目(GJJ170485);国网宁夏公司科技计划项目(SGTYHT/20-JS-224)。

摘　　要：砂石骨料属于不可再生资源,然而砂石资源短缺与建筑领域大规模扩张之间的供需矛盾日益升级。在我国“双碳”政策的大背景下,将西北地区丰富的风积沙、卵石资源应用到桩基骨料当中,是工程领域实现绿色环保、降本增效的重要手段。基于前期试验得到的新型卵石-风积沙混凝土配合比浇筑混凝土模型桩,再通过模型试验研究新型卵石-风积沙混凝土桩与土复合之后的承载性能变化规律。结果表明,优化配比后的卵石-风积沙混凝土能较好地满足复合地基的强度要求;增加桩长,减小桩径和桩间距,有助于减小地基的沉降量;在400 kPa加载作用下,桩的长度提升至一倍,地基总沉降量减小89%,在桩径和桩间距减小的工况对比可知,沉降量分别减小24%和36.4%。对于桩身应力,提高桩长、桩径,减小桩距,应力均表现出变大的趋势;对于桩土应力,提高桩长、桩径,减小桩距,地基土均表现出应力水平有所降低;对于桩土应力比,桩长越长桩土应力比越大。研究成果可以为卵石和风积沙的推广应用提供数据支持。Sand aggregate is a non-renewable resource,but the contradiction between supply and demand between the shortage of sand and stone resources and the large-scale expansion of the construction field is escalating.Under the background of the dual carbon policy of various countries,the application of abundant aeolian sand and pebble resources in northwest China to pile aggregate is an important means to achieve green environmental protection,cost reduction and efficiency increase in the engineering field.Based on the new pebble-aeolian sand concrete mix ratio obtained in the previous test,the concrete model pile was poured,and the bearing performance of the new pebble-aeolian sand concrete pile combined with soil was studied by model test.Results showed that:the optimized ratio of pebble-eolian sand concrete can better meet the strength requirements of composite foundation.Increasing pile length and decreasing pile diameter and pile spacing were helpful to reduce the settlement of foundation.Under 400kPa loading,the pile length was doubled,and the total settlement of the foundation was reduced by 89%.Compared with the condition of decreasing pile diameter and pile spacing,the settlement decreased by 24%and 36.4%,respectively.For the pile body stress,increasing the pile length,pile diameter,reducing the pile distance,the stress showed a trend of increasing.For pile soil stress,increasing pile length,pile diameter and decreasing pile distance can reduce the stress level of foundation soil.For the pile-soil stress ratio,the longer the pile length,the greater the pile-soil stress ratio.The research results of this paper can provide data support for the popularization and application of pebbles and aeolian sand.

关 键 词：桩土复合地基 卵石-风积沙混凝土 模型试验 砂石资源 湿陷性黄土 

分 类 号：TU473.12[建筑科学—结构工程]