房屋建筑下水泥搅拌桩复合地基沉降分析
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摘要
复合地基工后沉降已受到工程界越来越多的关注。本文通过理论分析、数值计算和工程实例对比，对采用水泥搅拌桩复合地基的建筑物的沉降和工后沉降进行了较为详细的分析和研究。
首先回顾了复合地基的发展历史，介绍了水泥搅拌桩复合地基的研究和应用现状，并总结了目前常用的几种复合地基的沉降计算方法。在此基础上，着重介绍了有限元程序PDSS在复合地基固结分析和沉降计算中的应用。通过对一维固结问题和平面固结问题的PDSS解和解析解的分析比较，验证了PDSS程序的正确性。进而运用PDSS程序对一教学楼和一实验综合楼的水泥搅拌桩复合地基的固结过程进行了较完整的数值计算，分析了该类复合地基中超静孔压和基底沉降的发展规律，并通过与规范法计算值和现场实测数据的比较，讨论了采用PDSS程序计算建筑物下水泥搅拌桩复合地基沉降和工后沉降的可行性。
本文工作表明，对采用水泥搅拌桩复合地基的建筑物的工后沉降进行计算和控制是十分重要的。PDSS程序为该类复合地基工后沉降的计算，提供了一条有效的途径。
The settlement of composite ground after construction has been received more and more attentions. In this thesis, a detailed study is made on the settlement of composite ground with cement-mixed columns after construction of building through theoretical and numerical as well as case analysis and comparisons.
Firstly, the development history of composite ground is reviewed, and the status of study and application of composite foundation with cement-mixed columns introduced. Then available methods for the computation of settlement of composite ground are listed. On this basis, the applications of FEM computer code PDSS in consolidation and settlement analyses are illustrated by comparing the FEM results with the analytical ones for one or two dimensional consolidation problems. Further more, the computer code PDSS is used to analyze the consolidation process of composite ground with cement-mixed columns under one teaching building and under one laboratory building, respectively, and the principle of the developments of excess pore water pressure in these composite ground and of the settlement is revealed. Finally, the FEM results are compared with the ones obtained from traditional method and field observation, and the feasibility of using PDSS to calculate the settlement of composite ground with cement-mixed colu
mns after construction of building is discussed.
It has been shown that it is very important to estimate and control the settlement of composite ground with cement-mixed columns after construction of building, and the computer code PDSS has provide an effective way for the computation of the settlement of such composite ground.
首先回顾了复合地基的发展历史，介绍了水泥搅拌桩复合地基的研究和应用现状，并总结了目前常用的几种复合地基的沉降计算方法。在此基础上，着重介绍了有限元程序PDSS在复合地基固结分析和沉降计算中的应用。通过对一维固结问题和平面固结问题的PDSS解和解析解的分析比较，验证了PDSS程序的正确性。进而运用PDSS程序对一教学楼和一实验综合楼的水泥搅拌桩复合地基的固结过程进行了较完整的数值计算，分析了该类复合地基中超静孔压和基底沉降的发展规律，并通过与规范法计算值和现场实测数据的比较，讨论了采用PDSS程序计算建筑物下水泥搅拌桩复合地基沉降和工后沉降的可行性。
本文工作表明，对采用水泥搅拌桩复合地基的建筑物的工后沉降进行计算和控制是十分重要的。PDSS程序为该类复合地基工后沉降的计算，提供了一条有效的途径。
The settlement of composite ground after construction has been received more and more attentions. In this thesis, a detailed study is made on the settlement of composite ground with cement-mixed columns after construction of building through theoretical and numerical as well as case analysis and comparisons.
Firstly, the development history of composite ground is reviewed, and the status of study and application of composite foundation with cement-mixed columns introduced. Then available methods for the computation of settlement of composite ground are listed. On this basis, the applications of FEM computer code PDSS in consolidation and settlement analyses are illustrated by comparing the FEM results with the analytical ones for one or two dimensional consolidation problems. Further more, the computer code PDSS is used to analyze the consolidation process of composite ground with cement-mixed columns under one teaching building and under one laboratory building, respectively, and the principle of the developments of excess pore water pressure in these composite ground and of the settlement is revealed. Finally, the FEM results are compared with the ones obtained from traditional method and field observation, and the feasibility of using PDSS to calculate the settlement of composite ground with cement-mixed colu
mns after construction of building is discussed.
It has been shown that it is very important to estimate and control the settlement of composite ground with cement-mixed columns after construction of building, and the computer code PDSS has provide an effective way for the computation of the settlement of such composite ground.
引文
[1] 龚晓南，高等土力学，浙江大学出版社，1996。
[2] 龚晓南，地基处理新技术，陕西科学技术出版社，1997．6。
[3] 龚晓南，复合地基理论及工程应用，中国建筑工业出版社，2002．11。
[4] 李远秀，水泥粉喷桩在软土地基加固处理中应用，深层搅拌法设计、施工经验交流会论文集，1993。
[5] 林琼，水泥搅拌桩复合地基试验研究，浙江大学硕士学位论文，1989。
[6] 刘一林，水泥搅拌桩复合地基变形性研究，浙江大学硕士学位论文，1990。
[7] 钱加欢、殷宗泽，土工原理与计算，水利电力出版社，1995。
[8] 沈珠江，用有限单元法计算软土地基的固结变形，水利水运科技情报，第1期，1977。
[9] 颜景忠，深层搅拌桩加固软土地基的施工实践，深层搅拌法设计、施工经验交流会论文集，1993。
[10] 谢康和、周健，岩土工程用限元分析理论与应用，科学出版社，2002．5。
[11] 徐刚毅，超长水泥搅拌桩复合地基工程应用，浙江大学硕士学位论文，2002。
[12] 杨光煦，深层搅拌桩复合地基的过渡层与过渡段，深层搅拌法设计、施工经验交流会论文集，1993。
[13] 杨位洸，地基及基础，中国建筑工业出版社，2001。
[14] 张土乔，水泥土的应力应变关系及搅拌桩破坏特性研究，浙江大学博士学位论文，1992。
[15] 章胜南，深层水泥搅拌桩应用的一些探讨，深层搅拌法设计、施工经验交流会论文集，1993。
[16] 郑松华，深层水泥搅拌桩在软土地基中应用，深层搅拌法设计、施工经验交流会论文集，1993。
[17] 曾小强，水泥土力学特性和复合地基变形计算研究，浙江大学硕士学位论文，1993。
[18] 朱伯芳，有限单元法原理与应用，水利电力出版社，1990。
[19] 朱百里、沈珠江等，计算土力学，上海科学技术出版社，1990。
[20] H. Shinsha, et al.. Consolidation settlement and lateral displacement
of soft ground improved by sand drain. Soils & Foundations(in Japanese),1982.
[21] I.M. Smith & R. Hobbs. Biot anaiysis of consolidation beneath embankments. Geotechnique, Vol. 26, No.1, 1976.
[22] M. A. Biot. General theory of three dimensional consolidation. J. App. Physics, Vol. 12, 1941.
[23] R. S. Sandhu & E. L. Wilson. Finite Element Analysis of Seepage in Elastic Media. JEMD, ASCE, Vol. 95, No. EM3, 1969.
[24] Y. K. Cheung, P. K. K. Lee & K.H. Xie, Some remarks on two and three dimensional consolidation analysis of sand-drained ground. Computers and Geotechnics 12, 1991.
[2] 龚晓南，地基处理新技术，陕西科学技术出版社，1997．6。
[3] 龚晓南，复合地基理论及工程应用，中国建筑工业出版社，2002．11。
[4] 李远秀，水泥粉喷桩在软土地基加固处理中应用，深层搅拌法设计、施工经验交流会论文集，1993。
[5] 林琼，水泥搅拌桩复合地基试验研究，浙江大学硕士学位论文，1989。
[6] 刘一林，水泥搅拌桩复合地基变形性研究，浙江大学硕士学位论文，1990。
[7] 钱加欢、殷宗泽，土工原理与计算，水利电力出版社，1995。
[8] 沈珠江，用有限单元法计算软土地基的固结变形，水利水运科技情报，第1期，1977。
[9] 颜景忠，深层搅拌桩加固软土地基的施工实践，深层搅拌法设计、施工经验交流会论文集，1993。
[10] 谢康和、周健，岩土工程用限元分析理论与应用，科学出版社，2002．5。
[11] 徐刚毅，超长水泥搅拌桩复合地基工程应用，浙江大学硕士学位论文，2002。
[12] 杨光煦，深层搅拌桩复合地基的过渡层与过渡段，深层搅拌法设计、施工经验交流会论文集，1993。
[13] 杨位洸，地基及基础，中国建筑工业出版社，2001。
[14] 张土乔，水泥土的应力应变关系及搅拌桩破坏特性研究，浙江大学博士学位论文，1992。
[15] 章胜南，深层水泥搅拌桩应用的一些探讨，深层搅拌法设计、施工经验交流会论文集，1993。
[16] 郑松华，深层水泥搅拌桩在软土地基中应用，深层搅拌法设计、施工经验交流会论文集，1993。
[17] 曾小强，水泥土力学特性和复合地基变形计算研究，浙江大学硕士学位论文，1993。
[18] 朱伯芳，有限单元法原理与应用，水利电力出版社，1990。
[19] 朱百里、沈珠江等，计算土力学，上海科学技术出版社，1990。
[20] H. Shinsha, et al.. Consolidation settlement and lateral displacement
of soft ground improved by sand drain. Soils & Foundations(in Japanese),1982.
[21] I.M. Smith & R. Hobbs. Biot anaiysis of consolidation beneath embankments. Geotechnique, Vol. 26, No.1, 1976.
[22] M. A. Biot. General theory of three dimensional consolidation. J. App. Physics, Vol. 12, 1941.
[23] R. S. Sandhu & E. L. Wilson. Finite Element Analysis of Seepage in Elastic Media. JEMD, ASCE, Vol. 95, No. EM3, 1969.
[24] Y. K. Cheung, P. K. K. Lee & K.H. Xie, Some remarks on two and three dimensional consolidation analysis of sand-drained ground. Computers and Geotechnics 12, 1991.