移动射流加固吸力式沉箱基础承载特性试验研究  

Experimental study on bearing characteristics of reinforced suction caisson foundation with mobile jet technology

作　　者：毛龙 朱文波[2,3] 杨嘉毅[1] 李勇海 邓会元 程丹莲 MAO Long;ZHU Wenbo;YANG Jiayi;LI Yonghai;DENG Huiyuan;CHENG Danlian(China Railway Fourth Division Group Co.,Ltd.,Hefei 230022,China;Advanced Ocean Institute of Southeast University,Nantong 226010,China;School of Civil Engineering,Southeast University,Nanjing 211189,China;CCCC Highway Consultants Co.,Ltd.,Beijing 100032,China)

机构地区：[1]中铁四局集团有限公司,安徽合肥230022 [2]东南大学南通海洋高等研究院,江苏南通226010 [3]东南大学土木工程学院,江苏南京211189 [4]中交公路规划设计院有限公司,北京100032

出　　处：《岩土工程学报》2024年第S02期226-230,241,共6页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(52208333,51878160,52378328);中国交建集团揭榜挂帅项目(2023-ZJKJ-01)。

摘　　要：吸力式沉箱基础基础因其尺寸范围广、极限水深大、经济性好、施工便捷等优势,受到了广大工程师青睐。然而软黏土中吸力式沉箱基础水平与竖向承载力较低,尚未形成一套有效的吸力式沉箱基础承载力提升技术。为了有效提高吸力式沉箱基础承载力,创新性提出了移动射流加固技术及劲性复合吸力式沉箱基础形式。通过吸力式沉箱基础移动射流加固试验以及加固后模型试验,研究加固后吸力式沉箱基础水平与竖向承载特性。试验结果表明:加固后的沉箱模型水平承载力是未加固沉箱模型的2.5~3.5倍,加固后的沉箱模型竖向抗拔承载力是未加固沉箱模型的3.5~5.0倍,可以看出加固后沉箱基础水平与竖向承载提升较为明显。通过后移动射流加固技术,不仅提高桩土接触面积同时提升桩周土体强度,移动射流管道布置越多,浆液包裹越好,包络线面积越大,荷载玫瑰越均匀,承载力差异较小。在移动射流管道布置时需考虑射流参数、土体特性等因素,移动射流管道布置需满足相邻破土半径搭接要求。通过对移动射流加固吸力式沉箱基础承载特性的初步探究,为吸力式沉箱基础移动射流加固技术工程应用以及劲性复合吸力式沉箱基础理论分析提供参考。The suction caisson foundation has been favored by many engineers due to its advantages such as wide size range,large ultimate water depth,good economy and convenient construction.However,the horizontal and vertical bearing capacities of suction caisson foundations are relatively low in soft clay.There is still no effective method to improve the bearing capacity of the suction caisson foundations.In order to effectively improve the bearing capacity of the suction caisson foundations,the mobile jet reinforcement technology and the form of rigid composite suction caisson foundation are innovatively proposed.The bearing characteristics of a suction caisson foundation reinforced by the mobile jet technology are studied through the model tests.The results shwo that the horizontal bearing capacity of the rigid composite suction caisson foundation is about 2.5~4.0 times higher than that of the ordinary caisson.The uplift bearing capacity of the rigid composite suction caisson foundation is about 3.5~5.0 times higher than that of the ordinary caisson.The propesed method increases the contact area between the pile and the soil and enhances the strength of the soil around the pile.The cement slurry evenly wraps around the caisson and the grouting effects are satisfactory.The jet parameters and soil characteristics need to be considered in the design of the new suction caisson foundation.It can provide reference for the engineering application of the mobile jet reinforcement technology and the theoretical analysis of the rigid composite suction caisson foundation.

关 键 词：吸力式沉箱基础 承载力提升 移动射流技术 软黏土 

分 类 号：TU443[建筑科学—岩土工程]