真空预压加固吹填土地基承载力评估分析

作者:黄朝煊
单位:浙江省水利水电勘测设计院
摘要:依托浙江省舟山市某吹填工程,对真空预压加固技术进行总结,对真空预压加固过程中真空度传递、土体孔隙水压变化及地基沉降等进行监测,并对加固后的地基承载力进行评估。开展1~4m深度处地基土十字板剪切试验与浅层平板荷载试验,根据十字板抗剪强度推算的地基承载力特征值为51.14kPa,满足≥50kPa的设计要求;根据浅层平板荷载试验结果及相关规范的规定,判定地基承载力特征值≥100kPa,同样满足≥50kPa的设计要求,即认为本工程真空预压加固后的地基承载力特征值满足工程要求。
关键词:软土地基加固真空预压孔隙水压抗剪强度承载力
作者简介:黄朝煊,高级工程师,E-mail:516227811@qq.com。
基金:浙江省基础公益研究计划项目(LGF18E090004);浙江省水利厅科技计划项目(RC1701);浙江省水利水电勘测设计院科标业项目(B1609,B1803)。 -页码-:63-67
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Evaluation and Analysis of the Bearing Capacity for the Dredger Fill Foundation Reinforced by Vacuum Preloading
HUANG Chaoxuan
(Zhejiang Design Institute of Water Conservancy & Hydro-electric Power)
Abstract: Relying on a dredger fill project in Zhoushan City, Zhejiang Province, this paper summarizes the vacuum preloading reinforcement technology. This paper monitors the transfer of vacuity, the change of soil pore water pressure and the settlement of foundation during the process of vacuum preloading reinforcement. This paper evaluates the bearing capacity of the reinforced foundation. The vane shear tests of the foundation soil at a depth of 1 m to 4 m and shallow plate loading tests are carried out. The characteristic value of the foundation bearing capacity calculated according to the vane shear strength is 51.14 kPa, which meets the design requirements of greater or equal to 50 kPa. According to the results of the shallow plate loading tests and the relevant regulations, it is determined that the characteristic value of the foundation bearing capacity is greater or equal to 100 kPa, which also meets the design requirements of greater or equal to 50 kPa. It is considered that the characteristic value of the foundation bearing capacity after the vacuum preloading reinforcement of this project meets the engineering requirements.
Keywords: soft soil foundation; reinforcement; vacuum preloading; pore water pressure; shear strength; bearing capacity
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