真空联合堆载预压在连云港道路拓宽工程中的应用  

Application of Vacuum and Surcharge Preloading Method in Improving Lianyungang Soft Marine Clay for Road Widening Project

作　　者：宣有金 王兵 吴军[2] 邓永锋[2] XUAN You-jin;WANG Bing;WU Jun;DENG Yong-feng(Lianyuangang Transportation Construction Group Co.,Ltd,Lianyungang Jiangsu 222006 China;School of Transportation,Southeast University,Nanjing Jiangsu 211189 China)

机构地区：[1]连云港市交通集团有限公司,江苏连云港222006 [2]东南大学交通学院,江苏南京211189

出　　处：《江苏建筑》2020年第2期74-77,共4页Jiangsu Construction

摘　　要：根据连云港近海道路拓宽工程地基处理的监测数据,详细分析了真空联合堆载预压作用下地表沉降、静力触探等变化规律,结果表明真空联合堆载预压能有效加固沿海深厚软土地基,且能极大降低地基失稳的概率。其中,真空联合堆载预压535 d时,实测平均沉降量Sm为1385.5 mm,预估沉降量S∞为1488.0 mm,基于沉降量计算得到平均固结度Us为93.1%。静力触探结果表明锥尖阻力和侧摩阻力在各深度处较处理前均增加了约2~10倍;尽管如此,无论实测沉降量还是根据沉降资料推算的最终沉降量均表明向海侧(靠近现有路基)和背海侧路基(远离现有路基)存在较大的沉降差异。在设计及施工时应予以重视。This paper presents a case study using the combined vacuum and surcharge preloading method to improve the thick soft clay foundation for an embankment widening project in Lianyungang,China.Based on the monitoring data,the detailed analysis of the surface settlement and cone penetration tests(CPTs)were conducted.The results show that after the combined vacuum and surcharge preloading,the ground settled more than 1.4 m,the average consolidation degree was more than 90%,and the cone and sleeve resistance of the soft clays increased by approximately 2-10 times.However,the differential settlement between the inward(close to the current embankment)and outward(away from the current embankment)was also observed.In this case,the pavement performance by this differential settlement would need to be focused on.

关 键 词：真空联合堆载预压 道路拓宽 地表沉降 静力触探 

分 类 号：U41[交通运输工程—道路与铁道工程]