真空—堆载联合预压法加速滩涂固结的参数敏感性分析
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摘要
本文就真空-堆载联合预压法在加速滩涂软土固结方面进行了研究,主要是应用有限元分析软件ABAQUS进行了参数敏感性的分析研究。
首先就滩涂开发中碰到的如何加快软土固结沉降速率的问题,引入软基处理方法—真空-堆载联合预压法,分析了这个问题的研究背景和研究现状。整理了真空-堆载联合预压法的施工工艺流程,对这一施工工法作了全面的介绍。接着系统介绍了软土固结的有限元分析基础Biot固结理论,并介绍了适用于进行土体弹塑性分析的Mohr-Coulomb本构模型。
在此基础上,通过有限元分析软件ABAQUS对实际工程进行有限元的建模分析。首先验证了弹塑性有限元分析在滩涂软土固结分析中的可靠性与合理性。然后针对真空-堆载联合预压工程中影响土体固结沉降效率的因素进行了参数敏感性的分析,分析了土体在经过真空-堆载联合预压处理的加固效果以及变形位移随参数变化的规律,结合施工对参数进行合理性分析,提出各种如何加快滩涂软土固结沉降速率以及尽量减少工程对周围环境的影响等的工程措施,对真空-堆载联合预压法在加速滩涂固结等方面的工程应用提供设计与施工上的参考和帮助。
This paper mostly studied how to advance and accelerate the consolidation of soft clay in shoal using surcharge incorporating vacuum preloading method. Then the sensitivity of parameters in engineering were analyzed by use of a finite element software named ABAQUS.
At first, when we explore the land resources in shoal, many problems are presented, such as how to advance and accelerate the consolidation of soft clay. Surcharge incorporating vacuum preloading method is a good method to reinforce soft foundation. This method has been used to improve the shoal soil. This matter is very significant and important. The construction technology of surcharge incorporating vacuum preloading was also studied. The basis of the finite element analysis, Biot's Consolidation Theory, was presented in detail. In analysis, Mohr-Coulomb constitutive model was used.
Secondly, on the basis of elasto-plastic model proposed in the paper, the consolidation analysis of soft clay in shoal was reliability and reasonable. Then the sensitivity of parameters in engineering were analyzed. According to the analysis, consolidation and lateral displacement were transformed in rule with the change of parameters. Linked with the construction technology, this paper proposed various methods to accelerate the settlement of consolidation and reduce the effect of surcharge to environment around. This could be useful and helpful to engineering design and construction.
首先就滩涂开发中碰到的如何加快软土固结沉降速率的问题,引入软基处理方法—真空-堆载联合预压法,分析了这个问题的研究背景和研究现状。整理了真空-堆载联合预压法的施工工艺流程,对这一施工工法作了全面的介绍。接着系统介绍了软土固结的有限元分析基础Biot固结理论,并介绍了适用于进行土体弹塑性分析的Mohr-Coulomb本构模型。
在此基础上,通过有限元分析软件ABAQUS对实际工程进行有限元的建模分析。首先验证了弹塑性有限元分析在滩涂软土固结分析中的可靠性与合理性。然后针对真空-堆载联合预压工程中影响土体固结沉降效率的因素进行了参数敏感性的分析,分析了土体在经过真空-堆载联合预压处理的加固效果以及变形位移随参数变化的规律,结合施工对参数进行合理性分析,提出各种如何加快滩涂软土固结沉降速率以及尽量减少工程对周围环境的影响等的工程措施,对真空-堆载联合预压法在加速滩涂固结等方面的工程应用提供设计与施工上的参考和帮助。
This paper mostly studied how to advance and accelerate the consolidation of soft clay in shoal using surcharge incorporating vacuum preloading method. Then the sensitivity of parameters in engineering were analyzed by use of a finite element software named ABAQUS.
At first, when we explore the land resources in shoal, many problems are presented, such as how to advance and accelerate the consolidation of soft clay. Surcharge incorporating vacuum preloading method is a good method to reinforce soft foundation. This method has been used to improve the shoal soil. This matter is very significant and important. The construction technology of surcharge incorporating vacuum preloading was also studied. The basis of the finite element analysis, Biot's Consolidation Theory, was presented in detail. In analysis, Mohr-Coulomb constitutive model was used.
Secondly, on the basis of elasto-plastic model proposed in the paper, the consolidation analysis of soft clay in shoal was reliability and reasonable. Then the sensitivity of parameters in engineering were analyzed. According to the analysis, consolidation and lateral displacement were transformed in rule with the change of parameters. Linked with the construction technology, this paper proposed various methods to accelerate the settlement of consolidation and reduce the effect of surcharge to environment around. This could be useful and helpful to engineering design and construction.
引文
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[15]楼永良.真空预压法加固深厚软土地基现场试验与设计理论研究.浙江大学硕士学位论文,2005
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[20]王强.塑料排水预压法加固软基机理及沉降计算方法研究.河海大学硕士学位论文,2004
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[23]蒋鑫,邱延峻,周成.深厚层软土地基袋装砂井处治的数值模拟.2005,26(1):31-35
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[43]周刚,傅少君,侯建国.软粘土地基弹粘塑性比奥固结理论的有限元分析.长江科学院院报,2004,21(1):18-25
[44]Cholachat Rujikaitkamjorn and Buddhimalndraratna.Improvement of Soft Clays UsingVacuum-assisted Consolidation Method.Geo Congress,2006
[45]J.Chu and S.W.Yan.Estimation of Degree of Consolidation for Vacuum Preloading Projects.International Journal of Geomechaanics,2005,5(2):158-165
[46]谢康和,曾国熙等.应变条件下的砂井地基固结解析理论.岩土工程学报,1989,11(2):3-17
[47]徐立新,陈云敏等.真空预压法加固高速公路软基的有限元分析.河海大学学报,2004,32(5):597-591
[48]刘汉龙,彭劼,陈永辉.真空-堆载联合预压的地基沉降简化计算方法.岩土力学,2006,27(5):745-748
[49]刘汉龙,彭劼,陈永辉等.真空-堆载联合预压处理高速公路软基三维有限元计算.岩土力学,2003,24(6):247-252
[50]刘吉福,黄腾,魏金霞.影响真空堆载预压加固路基效果的主要因素.路基工程,2007,133(4):53-54
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[2]浙江省滩涂围垦技术开发与研究展望.浙江水利科技,2005,142(6):1-2
[3]徐承祥,周柏水.浙江滩涂围垦的现状与展望.东海海洋,2004,22(4):53-58
[4]裘江海,蒋鹏.国内外滩涂开发与研究进展.浙江水利科技,2005,139(3):12-14
[5]ABAQUS6.5,Analysis User's Manual
[6]赵维炳,陈永辉,龚有平.平面应变有限元分析中砂井的处理方法.水利学报,1998,20(6):53-57
[7]陈远洪,洪宝宁,龚道勇.软土地基真空联合堆载预压的粘弹塑性有限元分析.水运工程,2002,339(4):9-12
[8]B.Indraratna,I.Sathananthan and C.Rujikiatkamjorn.Analytical and Numerical Modeling of Soft Soil Stabilized by Prefabricated Vertical Drains Incorporating Vacuum Preloading.International Journal of Geomechanics,2005,5(2):114-124
[9]J.C.Chai,S.Hayashi and J.P.Carter.Vacuum Consolidation and Its Combination with Embankment Loading.Ground Modification and Seismic Mitigation,2006,GSP 152:177-184
[10]C.Rujikiatkamjorn and B.Indraratna.Analysis of Radial Vacuum-Assisted Consolidation Using 3D Finite Element Method.New Peaks in Geotechnics,ASCE,2007
[11]郭佑雄,汪肇京等.塑料排水带堆载法在围海造陆工程中的应用.岩石力学与工程学报,2004.23(6):1025-1031
[12]高晖.ABAQUS在软基固结过程分析中的应用研究.武汉理工大学硕士学位论文,2006
[13]连志龙.水力压裂扩展的流固耦合数值模拟研究.中国科学技术大学博士学位论文,2007
[14]孙立川.塑料排水板堆载预压法沉降计算研究.同济大学硕士学位论文,2005
[15]楼永良.真空预压法加固深厚软土地基现场试验与设计理论研究.浙江大学硕士学位论文,2005
[16]娄炎,娄斌.真空联合堆载预压加固软基中的几个问题.地基处理理论与实践,2006,65-70
[17]娄炎,伊敬泽.真空联合堆载预压加荷速率的控制.公路,2006,8:279-282
[18]鲁绪文,刘慈军,娄炎等.真空堆载联合预压技术加固高速公路桥头软基试验研究.水利水运工程学报,2007,1:21-26
[19]段冰.真空-堆载联合预压法的影响因素研究及数值分析.浙江大学硕士学位论文,2005
[20]王强.塑料排水预压法加固软基机理及沉降计算方法研究.河海大学硕士学位论文,2004
[21]朱向荣,王金昌.ABAQUS软件中部分土模型简介及其工程应用.岩土力学,2004,25(2):144-148
[22]王金昌,陈页开.ABAQUS在土木工程中的应用.浙江大学出版社,2006
[23]蒋鑫,邱延峻,周成.深厚层软土地基袋装砂井处治的数值模拟.2005,26(1):31-35
[24]陈小丹,赵维炳.考虑井阻和涂抹的砂井地基平面应变等效方法分析.岩土力学,2005,4:567-571
[25]石亦平,周玉蓉.ABAQUS有限元分析实例详解.机械工业出版社,2006
[26]谢康和,周健.岩土工程有限元分析理论与应用.科学出版社,2002
[27]龚晓南.土力学.中国建筑工业出版社,2002
[28]G.W.Holton.Vacuum stabilization of subsoil beneath runway extension at Philadelphia.International airport Proc of VI ECSMFE,1965
[29]吴家兴.真空-堆载联合预压软基处理技术研究.西南交通大学硕士学位论文,2005
[30]杨震,陈宾.浅谈我国高等级公路软基处理研究现状与发展.西部探矿工程,2006,11:209-210
[31]韩莹莹.软土地基处理方法综述及其应用.中国水运,2007,6:33-34
[32]沈珠江,陆舜英.软土地基真空排水预压的固结变形.岩土工程学报,1986,8(3):7-15
[33]娄炎等.真空排水预压加固软土地基的理论与实践.南科院,1988
[34]李丽慧,王清等.真空排水预压下土体变形的应力路径分析.工程地质学报,2001,9(2):170-174
[35]丁绿芳,郭志平,赵维炳.真空预压加固软基时土体的损伤.河海大学学报,30(4):57-60
[36]王炳龙等.真空联合堆载预压法加固软土地基的试验研究.同济大学学报,2006,34(4):499-503
[37]钱家欢,赵维炳.真空预压砂井地基固结分析的半解析方法.中国科学(A辑),1988,4:439-448
[38]陈环.真空预压加固软土地基的机理研究.真空预压加固软土地基论文集汇编,1986
[39]林丰,陈环.真空和堆载作用下砂井地基固结的边界元分析.岩土工程学报,1987,9(4):13-21
[40]叶柏荣,董志良.堆载及真空预压法加固地基竖向固结解析理论.华南港工,1990
[41]董志良.堆载及真空预压砂井地基固结解析理论.水运工程,1992,9:1-7
[42]殷宗泽,龚晓南.地基处理工程实例.中国水利水电出版社,2000
[43]周刚,傅少君,侯建国.软粘土地基弹粘塑性比奥固结理论的有限元分析.长江科学院院报,2004,21(1):18-25
[44]Cholachat Rujikaitkamjorn and Buddhimalndraratna.Improvement of Soft Clays UsingVacuum-assisted Consolidation Method.Geo Congress,2006
[45]J.Chu and S.W.Yan.Estimation of Degree of Consolidation for Vacuum Preloading Projects.International Journal of Geomechaanics,2005,5(2):158-165
[46]谢康和,曾国熙等.应变条件下的砂井地基固结解析理论.岩土工程学报,1989,11(2):3-17
[47]徐立新,陈云敏等.真空预压法加固高速公路软基的有限元分析.河海大学学报,2004,32(5):597-591
[48]刘汉龙,彭劼,陈永辉.真空-堆载联合预压的地基沉降简化计算方法.岩土力学,2006,27(5):745-748
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