Research on Influencing Factors of Bearing Characteristics of Cement-Soil Composite Piles in Soft Soil Foundations
-
摘要: 水泥土复合桩在承载能力、沉降控制及地基稳定性等方面表现良好,因此在软土地区应用潜力显著。为推广其工程应用,开展了软土地基中水泥土复合桩的承载特性研究。以某实际工程软土地基中应用的水泥土复合桩为研究对象,采用ABAQUS软件建立了考虑芯桩-水泥土-桩周土界面作用的数值模型。通过对比现场静载试验与数值模拟结果,验证了该模型的可靠性。基于验证后的模型,研究了水泥土复合桩的承载特性,并进一步考察了芯桩截面尺寸、水泥土厚度、水泥土强度对水泥土复合桩承载特性的影响。研究结果表明:在保证芯桩-水泥土界面接触强度的情况下,软土地基中水泥土复合桩受荷时,表现出摩擦桩的受力特征;增加芯桩截面尺寸与水泥土强度对水泥土复合桩承载能力影响较小,增加水泥土厚度能有效提高水泥土复合桩承载能力;当芯桩截面尺寸较小、水泥土强度较低时,水泥土复合桩有发生芯桩-水泥土界面脆性破坏的风险。Abstract: Owing to its excellent performance in terms of bearing capacity, settlement control, and foundation stability, the cement-soil composite pile exhibits significant application potential in soft ground. To promote its engineering application,this study investigated the bearing characteristics of cement-soil composite piles in soft soil foundations. Taking the cement-soil composite piles applied in the soft soil foundations of a practical project as the research object, a finite element model considering the interface interaction among the core pile, the cement-soil layer, and the surrounding soil was established using ABAQUS software. The reliability of the model was verified by comparing the results of in-situ static load tests and numerical simulations. Based on the verified model, the bearing characteristics of the cement-soil composite pile were studied, and the effects of core pile section size, cement-soil thickness, and cement-soil strength on its bearing characteristics were further examined. The research results showed that: provided that the interface contact strength between the core pile and cement-soil was ensured, the cement-soil composite pile in soft soil foundations exhibited the mechanical characteristics of a friction pile when subjected to loads; increasing the core pile section size and cement-soil strength had a relatively small effect on the bearing capacity of the cement-soil composite pile, while increasing the cement-soil thickness effectively improved its bearing capacity; When the core pile section size was small and the cement-soil strength was low, the cement-soil composite pile was at risk of brittle failure at the interface between the core pile and cement-soil.
-
[1] 宋义仲,程海涛,卜发东,等.管桩水泥土复合基桩工程应用研究[J].施工技术,2012,41(5):89-91. [2] 刘汉龙,赵明华.地基处理研究进展[J].土木工程学报,2016,49(1):96-115. [3] 高文生,王涛.地基基础技术创新与发展[J].建筑科学,2018,34(9):66-75. [4] 刘松玉,周建,章定文,等.地基处理技术进展[J].土木工程学报,2020,53(4):93-110. [5] 董平,陈征宙,秦然.砼芯水泥土搅拌桩在软土地基中的应用[J].岩土工程学报,2002(2):204-207. [6] 王卫东,杨昱,吴江斌,等.软土地区预制桩搅拌植桩承载变形特性现场试验研究[J].岩土工程学报,2025,47(10):2136-2144. [7] 刘维正,刘弟民,雷陈鹏,等.软土地区加芯搅拌桩竖向承载与破坏模式分析[J].中南大学学报(自然科学版),2025,56(10):4235-4249. [8] 张永刚,李俊才,邓亚光.管桩水泥土复合桩荷载传递机制试验研究[J].南京工业大学学报(自然科学版),2013,35(6):79-85. [9] 施胜挺,李俊才,陆忠,等.管桩水泥土复合基桩抗拔荷载传递规律试验研究[J].南京工业大学学报(自然科学版),2017,39(6):124-129. [10] 王岩峻,姚建平,魏少伟,等.水泥土复合预制桩荷载传递机理[J].铁道建筑,2021,61(9):112-116. [11] 陈昌富,陈苏淑,朱世民,等.柔性基础下等芯型水泥土复合桩荷载传递特性分析[J].湖南大学学报(自然科学版),2023,50(1):152-160. [12] 文磊,刘钟,马晓华,等.粉土地基中劲性复合桩抗压承载特性与荷载传递机制研究[J].岩土力学,2024,45(2):511-524. [13] 王安辉,章定文,刘松玉,等.水平荷载下劲性复合管桩的承载特性研究[J].中国矿业大学学报,2018,47(4):853-861. [14] 王建,朱志慧,王洪玉,等.黏土地基劲性复合桩水平承载性能数值分析[J].铁道科学与工程学报,2020,17(6):1382-1389. [15] 周威,包华,彭杰,等.劲扩复合桩竖向抗压承载特性对比试验[J].科学技术与工程,2022,22(9):3696-3701. [16] 丁诗佳,朱志慧,杨鑫,等.劲性复合桩复合地基水平承载特性数值分析[J].公路,2022,67(10):106-112. [17] 张晓笛,段冰,吴健,等.混凝土芯水泥土复合桩竖向承载特性分析方法[J].岩土力学,2024,45(1):173-183. [18] 周友飞,刘成龙,吕海亮,等.复杂软弱土-砂土地基中劲性复合桩承载性能数值分析[J].科学技术与工程,2025,25(19):8187-8197. [19] 包华,洪俊青,夏胞刚,等.劲性复合桩外界面侧阻强化效应试验研究[J].建筑科学,2022,38(1):107-113. [20] 俞建霖,徐嘉诚,周佳锦,等.混凝土芯水泥土复合桩混凝土-水泥土界面摩擦特性试验研究[J].土木工程学报,2022,55(8):93-104. [21] 朱锐,周峰,盛强,等.水泥掺入量对劲性复合桩界面剪切特性的影响[J].南京工业大学学报(自然科学版),2023,45(5):546-553. [22] 中华人民共和国住房和城乡建设部.建筑基桩检测技术规范:JGJ 106-2014[S].北京:中国建筑工业出版社,2014. [23] DASSAULT S. ABAQUS/Standard:user's manual[M]. RI,USA:Dassault Systemes Simulia Corporation,2024. [24] 中华人民共和国住房和城乡建设部.水泥土复合管桩基础技术规程:JGJ/T 330-2014[S].北京:中国建筑工业出版社,2014. [25] 钱家欢,殷宗泽.土工原理与计算[M]. 2版.北京:中国水利水电出版社,1996. [26] 任建飞,周佳锦,龚晓南,等.方桩-水泥土接触面摩擦特性试验研究[J].浙江大学学报(工学版),2023,57(7):1374-1381. [27] 中华人民共和国住房和城乡建设部.劲性复合桩技术规程:JGJ/T 327-2014[S].北京:中国建筑工业出版社,2014. [28] POTTS D M,ZDRAVKOVIĆ L. Finite element analysis in geotechnical engineering:application[M]. London:Telford,2001. [29] 张石友,孙海建,赵自文.混凝土芯水泥土搅拌桩复合地基现场试验研究[J].地下空间与工程学报,2016,12(6):1702-1709. [30] 任连伟,刘汉龙,张华东,等.高喷插芯组合桩承载力计算及影响因素分析[J].岩土力学,2010,31(7):2219-2225. -
点击查看大图
计量
- 文章访问数: 29
- HTML全文浏览量: 10
- PDF下载量: 0
- 被引次数: 0
登录
注册
E-alert
登录
注册
E-alert
下载: