不同浅层加固深度对深层真空预压影响分析  

Analysis of Effects on Deep-Layer Vacuum Preloading by Different Shallow Reinforcing Depths

作　　者：张岩 张瑞棋[2] Zhang Yan;Zhang Ruiqi(Tianjin Lingang Construction&Development Co.,Ltd.,Tianjin 300452,China;CCCC Tianjin Port Engineering Institute Co.,Ltd.,Tianjin 300222,China)

机构地区：[1]天津临港建设开发有限公司,天津300452 [2]中交天津港湾工程研究院有限公司,天津300222

出　　处：《港口航道与近海工程》2023年第5期75-78,共4页Port,Waterway and Offshore Engineering

摘　　要：新吹填软土地基在进行软土地基加固过程中,常常会出现排水板弯折,进而影响排水加固效果。选取天津某吹填土地基设计现场试验,采用两种不同浅层插板深度进行浅层真空预压,验证浅层真空预压加固吹填淤泥对深层真空预压排水板弯折的影响程度及对深层真空预压加固效果的影响。对比现场两个试验区加固前后土性指标、地表沉降量和残余沉降量、十字板抗剪强度和地基承载力均有所提高,表明加深浅层真空预压有利于减轻深层真空预压加固时排水板的弯折,有利于提高加固效果。In the process of reinforcing newly dredger-filled foundation,such phenomenon as drain bands being bent often occurs,which lowers the effect of drainage reinforcement.A shallow vacuum preloading test is carried out based on two different shallow drain-band depths within the range of a selected dredger-fill foundation in Tianjin.The testing result will verify the influence of shallow vacuum preloading on the bending rate of deep-layer vacuum preloading drain bands as well as deep vacuum preloading reinforcement effect.The comparative analysis shows that foundation reinforcement improves soil property index,surface settlement and residual settlement,vane shear strength and bearing capacity of two field testing areas,the increased shallow vacuum preloading depth can effectively reduce the bending rate of drain bands and improve the effect of reinforcement during deep-layer vacuum preloading.

关 键 词：浅层加固 排水板弯折 真空预压 残余沉降 承载力 吹填淤泥 

分 类 号：TU43[建筑科学—岩土工程]