山东大学学报 (工学版) ›› 2023, Vol. 53 ›› Issue (1): 68-75.doi: 10.6040/j.issn.1672-3961.0.2021.456
• • 上一篇
魏焕卫,刘奔奔*
WEI Huanwei, LIU Benben*
摘要： 为研究在黏土砂层交替分布地基条件下间隔分布的黏土层在固结过程中的相互影响,提出一种新的固结计算模型,并通过数值变换法给出模型中各土层超孔压的半解析解。对理论解答分别进行理论验证、数值验证的基础上,分析部分参数对黏土层固结的影响。研究表明,在确定黏土层中不排水面位置的前提下,提出的理论计算方法可以有效计算多级加载工况中两相邻不排水面之间的土层超孔压;这种地基条件下,考虑黏土层在固结过程中的相互影响对保证计算结果的准确性有重要意义;黏土层固结性状对砂层厚度、砂层渗透系数的敏感性相同;大部分堆载预压工程按一维固结理论进行计算时得到的结果误差偏大。研究结果可为以整体分析的方式研究黏土砂层交替分布地基的固结性状提供参考。
中图分类号:
| [1] 朱向荣, 李振, 王金昌. 舟山国家石油储备基地堆载预压加固效果分析[J]. 岩土力学, 2008, 29(4): 881-886. ZHU Xiangrong, LI Zhen, WANG Jinchang. Analysis of consolidation effects of zhoushan national oil reserve base improved by preloading combined with plastic drains[J]. Rock and Soil Mechanics, 2008, 29(4): 881-886. [2] 薛双运, 俞演名, 夏军红, 等. 软土地基堆载预压处理失效及二次处理分析[J]. 浙江工业大学学报, 2020, 48(1): 103-111. XUE Shuangyun, YU Yanming, XIA Junhong, et al. Analysis on failure of surcharge preloading and secondary treatment of soft road subgrade[J]. Journal of Zhejiang University of Technology, 2020, 48(1): 103-111. [3] 张甲峰, 钱建固, 张合青, 等. 塑料排水板联合超载预压处理超大面积深厚软基的数值分析[J]. 岩土工程学报, 2013, 35(增刊2): 892-896. ZHANG Jiafeng, QIAN Jiangu, ZHANG Heqing, et al. Numerical analysis of oversized deep soft foundation improved by plastic drainage plates combined with surcharge preloading[J]. Chinese Journal of Geotechnical Engineering, 2013, 35(Suppl.2): 892-896. [4] DONG H N, HORPIBULSUK S, SUDDEEPONG A, et al. Full scale consolidation test on ultra-soft soil improved by prefabricated vertical drains in MAE MOH mine, Thailand[J]. Geotextiles and Geomembranes, 2021, 49(1): 72-80. [5] 杨爱武, 潘亚轩, 曹宇, 等. 吹填软土低位真空预压室内试验及其数值模拟[J]. 岩土力学, 2019, 40(2): 539-548. YANG Aiwu, PAN Yaxuan, CAO Yu, et al. Laboratory experiment and numerical simulation of soft dredger fill with low vacuum pre-compression[J]. Rock and Soil Mechanics,2019, 40(2): 539-548. [6] 蔡袁强, 周岳富, 王鹏, 等. 考虑淤堵效应的疏浚淤泥真空固结沉降计算[J]. 岩土力学, 2020, 41(11): 3705-3713. CAI Yuanqiang, ZHOU Yuefu, WANG Peng, et al. Calculation on settlement of dredged slurry treated by vacuum preloading method with consideration of clogging effects[J]. Rock and Soil Mechanics, 2020, 41(11): 3705-3713. [7] 马国栋. 浅议排水固结法中的水平排水体[J]. 岩土工程界, 2004, 7(9): 53-54. MA Guodong. Simple discussions on horizontal drainbody for consolidation method[J]. Geotechnical Engineering World, 2004, 7(9): 53-54. [8] GRAY H. Simultaneous consolidation of contiguous layers of unlike compressible soils[J]. Transactions, 1944, 70(2): 149-166. [9] 徐梨丹, 雷国辉. 水平排水砂垫层对天然地基固结效率影响分析[J]. 河海大学学报(自然科学版), 2016, 44(1): 78-83. XU Lidan, LEI Guohui. Effect of horizontal sand drainage cushion on consolidation efficiency of natural ground[J]. Journal of Hehai University(Natural Sciences), 2016, 44(1): 78-83. [10] 范鹤滨, 梅国雄. 分布式排水边界下均质地基固结有限元分析[J].解放军理工大学学报(自然科学版), 2016, 17(5): 438-444. FAN Hebin, MEI Guoxiong. Finite element consolidation analysis with distributed drainage boundaries in homogeneous ground[J]. Journal of PLA University of Science and Technology(Natural Science Edition), 2016, 17(5): 438-444. [11] GIBSON R E, SHEFFORD G C. The efficiency of horizontal drainage layers for accelerating consolidation of clay embankments[J]. Geotechnique, 1968, 18(3): 327-335. [12] TAN S A, LIANG K M, YONG K Y, et al. Drainage efficiency of sand layer in layered clay-sand reclamation[J]. Journal of Geotechnical Engineering,1992, 118(2): 209-228. [13] 蒙宇涵, 张必胜, 陈征, 等. 线性加载下含砂垫层地基固结分析[J]. 岩土力学, 2020, 41(2): 461-468. MENG Yuhan, ZHANG Bisheng, CHEN Zheng, et al. Consolidation analysis of foundation with sand blankets under ramp loading[J]. Rock and Soil Mechanics, 2020, 41(2): 461-468. [14] 雷国辉, 李赞, 徐梨丹. 含砂垫层地基二维固结自由应变解[J]. 岩土工程学报. 2016, 38(2): 193-201. LEI Guohui, LI Zan, XU Lidan. Free-strain solutions for two-dimensional consolidation with sand blankets[J]. Chinese Journal of Geotechnical Engineering, 2016, 38(2): 192-201. [15] 李红坡, 陈征, 冯健雪, 等. 双层地基水平排水砂垫层位置优化研究[J]. 岩土力学, 2020, 41(2): 437-444. LI Hongpo, CHEN Zheng, FENG Jianxue, et al. Study on position optimization of horizontal drainage sand blanket of double layer foundation[J].Rock and Soil Mechanics, 2020, 41(2): 437-444. [16] 蒙宇涵, 陈征, 冯健雪, 等. 初始孔压非均布下一维地基砂垫层优化研究[J].岩土力学, 2019, 40(12): 4793-4800. MENG Yuhan, CHEN Zheng, FENG Jianxue, et al. Optimization of one-dimensional foundation with sandblankets under the non-uniform distribution of initial excess pore water pressure[J]. Rock and Soil Mechanics, 2019, 40(12): 4793-4800. [17] 李勇义. 连续排水边界下一维固结理论及其不排水面研究[D]. 南宁: 广西大学, 2018. LI Yongyi. Study of one-dimensional consolidated theory and undrained plane with continuous drainage boundaries[D]. Nanning: Guangxi University, 2018. [18] VALSA J, LUBOMÍR B. Approximate formulae for numerical inversion of Laplace transforms[J]. International Journal of Numerical Modelling Electronic Networks, Devices and Fields, 2015, 11(3): 153-166. [19] HOOG F D, KNIGHT J H, STOKES A N. An improved method for numerical inversion of Laplace transforms[J]. SIAM Journal on Scientific and Statistical Computing, 1982, 3(3):357-366. [20] STEHFEST H. Algorithm 368: numerical inversion of Laplace transforms[J]. Communications of the ACM, 1970, 13(1): 47-49. |
| [1] | 何剑平1,3,陈卫忠2. 碎石排水层地下结构非自由场液化数值试验分析[J]. 山东大学学报(工学版), 2011, 41(3): 93-100. |
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