走马湖工程软基处理超载预压影响因素研究  

Influencing Factors of Preloading Method in the Soil Improvement in Zouma Lake Project

作　　者：朱方海 胡胜刚[2] ZHU Fanghai;HU Shenggang(Hubei International Logistics Airport Group,Ezhou 436000;Key Laboratory for Geotechnics and Geotechnical Engineering of Water Resources Ministry,Yangtze River Scientific Research Institute,Wuhan 430010)

机构地区：[1]湖北国际物流机场有限公司,湖北鄂州436000 [2]长江科学院水利部岩土力学与工程重点实验室,武汉430010

出　　处：《土工基础》2022年第2期122-126,共5页Soil Engineering and Foundation

基　　金：青年科学基金项目(51709016);长江科学院“中央级公益性科研院所基本科研业务费”项目(CKSF2019199/YT)。

摘　　要：机场工程对飞行区的工后沉降和工后差异沉降要求严格,在进行大面积的软基处理时,多采用排水固结+超载预压方案,方案中排水板间距和超载比是影响软基处理质量和效果的关键因素。然而地基处理规范中对排水板间距规定为0.7 m~2.1 m,可取值范围较大,超载比则需根据理论计算确定,没有对取值的进一步限定,无法保证软基处理的质量和效果。以走马湖工程为对象,通过理论分析和室内模型试验,研究排水板间距和荷载超载比对固结沉降的影响;基于现场沉降监测数据,以预测的最终沉降量及土层固结度为指标,对比分析两因素对软土固结效果的影响,为同类工程建设提供参考。In airport engineering projects,there are strict requirements for the post construction settlement and post construction differential settlement in runways.The prefabricated vertical drainage method with surcharge preloading is often applied for the treatment of large soft soil areas.The spacing of the vertical drains as well as the surcharge ratio are the direct factors that affecting the quality and effect of the soft soil improvement.In the current design code for the soil improvement,the recommended vertical spacing varies between 0.7 m and 2.1 m with no clear theoretical recommendations on the applied surcharge ratio.Therefore,the quality and effect of soft improvement could not be guaranteed without careful engineering evaluation.In this paper,the Zouma Lake soil improvement was studied throughout the theoretical analysis and the model tests to illustrate the influence of spacing of the vertical drains and the surcharge ratio on the consolidation settlement.Based on the field settlement monitoring data,the influence effect of both factors on the soft soil consolidation was compared and analyzed,with indices of the predicted final settlement and the degree of soft soil consolidations.

关 键 词：软土 排水固结 超载预压 工后沉降 走马湖工程 

分 类 号：TU472[建筑科学—结构工程]