滨海软土地基塑料排水板堆载预压处理效果分析  

Analysis of Preloading Treatment Effect of Plastic Drainage Plate on Coastal Soft Soil Foundation

作　　者：邓尚强 DENG Shangqiang(China Railway 11th Bureau Group Co.Ltd.,Wuhan 430061,China)

机构地区：[1]中铁十一局集团有限公司,武汉430061

出　　处：《铁道建筑》2025年第3期126-133,共8页Railway Engineering

基　　金：中铁十一局集团有限公司专题科研项目(AH2022-0386)。

摘　　要：我国滨海区存在大量深厚复杂软弱地基,这种地基具有高压缩性、高含水率、高孔隙比,且厚度大、抗剪强度低、承载能力弱等特点,导致其地基处理难度大,强度与沉降变形均难以符合设计及相关规范要求。依托汕汕(汕头—汕尾)高速铁路动车所停车场地基处理工程,采用塑料排水板堆载预压法进行地基处理,通过建立三维有限元模型初步论证方案可行性,并选取典型区段进行现场监测,分析塑料排水板堆载预压法的地基处理效果。研究表明:相较于仅进行上部堆载,塑料排水板联合堆载预压,激活排水线时路基的最大沉降速率是未激活排水线的2.8倍;现场监测区内最大侧移速率为0.18 mm/d,最大沉降速率为6.67 mm/d,均满足规范和设计要求;施工期地基累计沉降为28.1 cm,达到设计最终沉降的93.7%,地基沉降在施工期已经基本完成。塑料排水板堆载预压法可以有效降低工后沉降,缩短施工周期,具有良好的地基处理效果,可为类似滨海区软弱地基处理提供参考。In coastal regions of China,there are a substantial number of deep,complex and soft foundations.These foundations are characterized by high compressibility,high groundwater levels,high void ratio,considerable thickness,low shear strength and weak bearing capacity,which bring about significant difficulties in foundation treatment and make it challenging for both strength and settlement deformation to meet the requirements of design and relevant specifications.Relying on the foundation treatment project of the parking lot of the Shantou-Shanwei high speed railway depot,the plastic drainage board surcharge preloading approach was adopted for foundation treatment.The feasibility of the scheme was initially demonstrated by establishing a three-dimensional finite element model,and a typical section was selected for on-site monitoring and testing to analyze the foundation treatment effect of the plastic drainage board surcharge preloading method.Research reveals that compared with only conducting the upper surcharge,the combined surcharge preloading of plastic drainage boards increases the maximum settlement rate of the subgrade by 2.8 times when the drainage lines are activated,compared to when they are not activated.The maximum lateral displacement rate within the on-site monitoring area is 0.18 mm/d,and the maximum settlement rate is 6.67 mm/d,both fulfilling the requirements of design codes.The cumulative settlement of the foundation during the construction period is 28.1 cm,reaching 93.7%of the designed final settlement,and the settlement deformation of the foundation has basically been completed during the construction period.The plastic drainage board surcharge preloading method can effectively reduce post-construction settlement,shorten the construction period,and has a favorable foundation treatment effect,providing a reference for the treatment of similar soft foundations in coastal areas.

关 键 词：软基加固 塑料排水板 堆载预压 有限元分析 监测分析 处理效果 

分 类 号：U213.14[交通运输工程—道路与铁道工程]