基于MIDAS的加筋垫层复合地基变形的研究分析
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摘要
对吹填软土地基固结产生的沉降变形进行研究,使其满足建筑物上部对地基承载力的要求.利用MIDAS有限元软件,建立加筋复合地基固结沉降计算模型,对不同工法下的复合地基进行数值模拟,在此基础上采用二维固结分析计算,研究了复合地基的沉降变化规律、超静孔隙水压力消散规律以及固结度规律.结果表明:采用加筋复合土工格栅垫层处理吹填软土复合地基,可有效调整桩土应力比,减少复合地基沉降量;随时间增加超静孔隙水压力收敛加快,有效应力增大,变形减小.另外,通过数值分析可知,加筋复合土工格栅垫层的使用可减少砂石使用量,节约经济成本.
Based on the research in settlement deformation caused by consolidation of filling soft soil foundation,this paper studies the requirements of the upper part of the building for the bearing capacity of the foundation.Consolidation settlement calculation model of reinforced composite foundation is established by using MIDAS finite element software.The numerical simulation of composite foundation under different construction methods is carried out.On this basis,two-dimensional consolidation analysis and calculation are adopted.The paper analyzes the law of settlement of the composite foundation,the law of excess pore water pressure dissipation and the degree of consolidation.The results show that,the reinforced composite geogrid cushion can be used to treat the soft soil composite foundation,which can effectively adjust the pile-soil stress ratio and reduce the settlement of the composite foundation.The pore water pressure will converge with time,and the effective stress can reduce the deformation.In addition,the numerical analysis shows that the use of reinforced composite geogrid cushion can reduce sand consumption and save economic cost.
Based on the research in settlement deformation caused by consolidation of filling soft soil foundation,this paper studies the requirements of the upper part of the building for the bearing capacity of the foundation.Consolidation settlement calculation model of reinforced composite foundation is established by using MIDAS finite element software.The numerical simulation of composite foundation under different construction methods is carried out.On this basis,two-dimensional consolidation analysis and calculation are adopted.The paper analyzes the law of settlement of the composite foundation,the law of excess pore water pressure dissipation and the degree of consolidation.The results show that,the reinforced composite geogrid cushion can be used to treat the soft soil composite foundation,which can effectively adjust the pile-soil stress ratio and reduce the settlement of the composite foundation.The pore water pressure will converge with time,and the effective stress can reduce the deformation.In addition,the numerical analysis shows that the use of reinforced composite geogrid cushion can reduce sand consumption and save economic cost.
引文
[1]张龙龙,时伟,胡瑞庚,等.沿海公路加筋地基动力特性试验研究[J].青岛理工大学学报,2017,38(5):8-14.ZHANG Long-long,SHI Wei,HU Rui-geng,et al.Experimental study on dynamic characteristics of reinforced foundation of coastal highway[J].Journal of Qingdao University of Technology,2017,38(5):8-14.(in Chinese)
[2]龚晓南.广义复合地基理论及工程应用[J].岩土工程学报,2007(1):1-13.GONG Xiao-nan.Generalized composite foundation theory and engineering application[J].Chinese Journal of Geotechnical Engineering,2007(1):1-13.(in Chinese)
[3]沈才华,任明,许永明.复合地基中砂垫层作用机理研究[J].河海大学学报(自然科学版),2003,31(5):569-572.SHEN Cai-hua,REN Ming,XU Yong-ming.Function of sand cushion in composite foundaion[J].Journal of Hohai University(Natural Science),2003,31(5):569-572.(in Chinese)
[4]刘汉龙,赵明华.地基处理研究进展[J].土木工程学报,2016,49(1):96-115.LIU Han-long,ZHAO Ming-hua.Review of ground improvement technical and its application in China[J].China Civil Engineering Journal,2016,49(1):96-115.(in Chinese)
[5]王斯海,陈海军,王世坚.不同土层结构场地强夯振动效应研究[J].施工技术,2016,45(S1):15-19.WANG Si-hai,CHEN Hai-jun,WANG Shi-jian.Study on vibration effect by dynamic compaction in different site condition of soil layer[J].Construction Technology,2016,45(S1):15-19.(in Chinese)
[6]ZHOU Huabao,WEN Xuejun.Model studies on geogrid-or geocell-reinforced sand cushion on soft soil[J].Geotextiles and Geomembranes,2007,26(3):231-238.
[7]陈运涛,王贵君,孟凡强,等.土工织物复合垫层法在新吹填软土地基加固中的应用与效果分析[J].岩土工程学报,2016,38(S1):169-172.CHEN Yun-tao,WANG Gui-jun,MENG Fan-qiang,et al.Application and analysis of the geotextile composite cushion in the ground improvement of the new dredger fill[J].Chinese Journal of Geotechnical Engineering,2016,38(S1):169-172.(in Chinese)
[8]刘开富,许家培,曹玲珑.刚柔性桩加筋垫层复合地基承载性状数值分析[J].浙江理工大学学报(自然科学版),2018,39(3):372-377.LIU Kai-fu,XU Jia-pei,CAO Ling-long.Numerical analysis on bearing behavior of rigid-flexible pile composite foundation with reinforced cushion[J].Journal of Zhejiang Sci-Tech University(Natural Sciences),2018,39(3):372-377.(in Chinese)
[9]陈蕾.排水粉喷桩复合地基固结理论研究[D].南京:东南大学,2006.CHEN Lei.Theory of consolidation of soft clay improved by GIM combined with PVD method[D].Nanjing:Southeast University,2006.(in Chinese)
[2]龚晓南.广义复合地基理论及工程应用[J].岩土工程学报,2007(1):1-13.GONG Xiao-nan.Generalized composite foundation theory and engineering application[J].Chinese Journal of Geotechnical Engineering,2007(1):1-13.(in Chinese)
[3]沈才华,任明,许永明.复合地基中砂垫层作用机理研究[J].河海大学学报(自然科学版),2003,31(5):569-572.SHEN Cai-hua,REN Ming,XU Yong-ming.Function of sand cushion in composite foundaion[J].Journal of Hohai University(Natural Science),2003,31(5):569-572.(in Chinese)
[4]刘汉龙,赵明华.地基处理研究进展[J].土木工程学报,2016,49(1):96-115.LIU Han-long,ZHAO Ming-hua.Review of ground improvement technical and its application in China[J].China Civil Engineering Journal,2016,49(1):96-115.(in Chinese)
[5]王斯海,陈海军,王世坚.不同土层结构场地强夯振动效应研究[J].施工技术,2016,45(S1):15-19.WANG Si-hai,CHEN Hai-jun,WANG Shi-jian.Study on vibration effect by dynamic compaction in different site condition of soil layer[J].Construction Technology,2016,45(S1):15-19.(in Chinese)
[6]ZHOU Huabao,WEN Xuejun.Model studies on geogrid-or geocell-reinforced sand cushion on soft soil[J].Geotextiles and Geomembranes,2007,26(3):231-238.
[7]陈运涛,王贵君,孟凡强,等.土工织物复合垫层法在新吹填软土地基加固中的应用与效果分析[J].岩土工程学报,2016,38(S1):169-172.CHEN Yun-tao,WANG Gui-jun,MENG Fan-qiang,et al.Application and analysis of the geotextile composite cushion in the ground improvement of the new dredger fill[J].Chinese Journal of Geotechnical Engineering,2016,38(S1):169-172.(in Chinese)
[8]刘开富,许家培,曹玲珑.刚柔性桩加筋垫层复合地基承载性状数值分析[J].浙江理工大学学报(自然科学版),2018,39(3):372-377.LIU Kai-fu,XU Jia-pei,CAO Ling-long.Numerical analysis on bearing behavior of rigid-flexible pile composite foundation with reinforced cushion[J].Journal of Zhejiang Sci-Tech University(Natural Sciences),2018,39(3):372-377.(in Chinese)
[9]陈蕾.排水粉喷桩复合地基固结理论研究[D].南京:东南大学,2006.CHEN Lei.Theory of consolidation of soft clay improved by GIM combined with PVD method[D].Nanjing:Southeast University,2006.(in Chinese)