利用变系数差分法分析吹填土固结特性

闫澍旺; 贾沼淋; 郭炳川; 孙立强

利用变系数差分法分析吹填土固结特性 English Version

闫澍旺^{1, 2},
贾沼淋^{1, 2},
郭炳川^{1, 2},
孙立强^{1, 2}

1. 天津大学建筑工程学院,天津 300072; 2. 天津大学水利工程仿真与安全国家重点实验室,天津 300072

基金项目: 国家自然科学基金面上项目（41272323）

详细信息

作者简介:
闫澍旺(1950- )，男，教授，主要从事岩土工程软土研究方面的工作。E-mail: yan_shuwang@126.com。

中图分类号: TU47
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出版历程
- 收稿日期: 2013-07-16
- 发布日期: 2013-11-24

Consolidation characteristics of fillings by variable coefficients finite difference method

YAN Shu-wang^{1, 2},
JIA Zhao-lin^{1, 2},
GUO Bing-chuan^{1, 2},
SUN Li-qiang^{1, 2}

1. School of Civil Engineering, Tianjin University, Tianjin 300072, China; 2. State Key Laboratory of Hydraulic Engineering Simulation and Safty, Tianjin University, Tianjin 300072, China

摘要

摘要: 按照真空预压规范设计的吹填土固结时间,经常发生吹填土固结度达不到设计要求。规范是根据井径比对固结系数进行折减来考虑吹填土固结特性,而吹填土的固结特性会受到加固过程中土体的孔隙比、渗透系数、压缩系数等因素随时间变化的影响。针对工程中出现的问题,结合模型试验的结果以及对土体的固结特性进行研究,用差分法对土体的固结情况进行数值计算。经与试验结果和差分法模拟结果对比,验证了方法的合理性,可作为实际工程的借鉴。
- 真空预压 /
- 巴隆理论 /
- 变固结系数 /
- 有限差分法
Abstract: In engineering practice, when using the vacuum preloading technique to improve the hydraulic filled slurry, the consolidation degree usually cannot reach the expected value calculated by the current design code in China within the construction period. In the current design code, the consolidation behavior of the slurry is considered by discounting the consolidation coefficient. The observed data show that the consolidation procedure is influenced by several factors, such as the void ratio, permeability and compressibility. Practical engineering problems are discussed combined with the results of model tests by using the finite difference method. The test data agree well with the numerical calculation, indicating that the proposed numerical method is reasonable and can be used to guide the practical design.
- vacuum preloading /
- Barron's theory /
- variable consolidation coefficient /
- finite difference method

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参考文献(8)

[1]	钱家欢, 殷宗泽. 土工原理与计算[M]. 北京: 中国水利水电出版社, 1996. (QIAN Jia-huan, YIN Zong-ze. Earthwork principle and calculation[M]. Beijing: China Water and Power Press, 1996. (in Chinese))
[2]	JTS 147—2—2009 真空预压加固软土地基技术规程[S]. 2009. (JTS 147—2—2009 Technical specification for vacuum preloading technique to improve soft soils[S]. 2009. (in Chinese))
[3]	董志良, 张功新, 周琦, 等. 天津滨海新区吹填造陆浅层超软土加固技术研发及应用[J]. 岩石力学与工程学报. 2011, 30(5): 1073-1080. (DONG Zhi-liang, ZHANG Gong-xin, ZHOU Qi, et al. Research and application of improvement technology of shallow ultra-soft soil formed by hydraulic reclamation in Tianjin Binhai New Area[J]. Chinese Journal of Rock Mechanics and Engineering, 2011, 30(5): 1073-1080. (in Chinese))
[4]	牛飞, 邱长林, 闫澍旺, 等. 真空预压下考虑渗透系数变化的吹填土地基固结分析[J]. 中国港湾建设, 2013(1): 29-34. (NIU Fei, QIU Chang-lin, YAN Shu-wang, et al. Analysis on consolidation of hydraulically reclaimed soil under vacuum preloading with change of permeability[J]. China Harbour Engineering, 2013(1): 29-34. (in Chinese))
[5]	叶正强, 李爱群, 杨国华, 等. 黏性土的渗透规律性研究[J]. 东南大学学报, 1999(5): 121-125. (YE Zheng-qiang, LI Ai-qun, YANG Guo-hua, et al. Study of permeability for cohesive soil[J]. Journal of Southeast University (Natural Science Edition), 1999(5): 121-125. (in Chinese))
[6]	谢新宇, 朱向荣, 谢康和, 等. 饱和土体一维大变形固结理论新进展[J]. 岩土工程学报, 1997, 19(4): 30-38. (XIE Xin-yu, ZHU Xian-grong, XIE Kang-he, et al. New development of saturated soil one-dimensional large-strain consolidation theories[J]. Chinese Journal of Geotechnical Engineering, 1997, 19(4): 30-38. (in Chinese))
[7]	高长胜, 汪肇京, 魏汝龙. 井阻和涂抹作用在排水板地基设计中的应用[J]. 水利水运科学研究, 1999(3): 213-221. (GAO Chang-sheng, WANG Zhao-jing, WEI Ru-long. Application of well resistance and smear effect in foundation design using prefabricated drains[J]. Journal of Nanjing Hydraulic Research Institute, 1999(3): 213-221. (in Chinese))
[8]	江辉煌. 砂井处理超软地基的固结计算[J]. 岩石力学与工程学报, 2010(2): 433. (JIANG Hui-huang. Consolidation calculation of super-soft ground with vertical drains[J]. Chinese Journal of Rock Mechanics and Engineering, 2010(2): 433. (in Chinese))