考虑地下水位影响的砂井地基强度增长计算

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摘要为深入了解真空联合堆载预压条件下深厚吹填软土地基强度增长的实际规律，基于有效应力原理和应力路径法对地基的强度增长机制进行定性分析，分析结果表明：地下水位线以上土体的强度增长规律和地下水位线以下的土体的强度增长规律是不尽相同的。鉴于此，考虑地下水位的影响，基于有效应力唯一性理论推导出砂井地基强度增长解析解。最后，以珠海港高栏港区某软基处理工程为依托，基于该解析解对真空联合堆载预压恒载过程中土体超静孔压消散稳定后的地基强度增长情况进行计算，并分别与室内无侧限抗压强度试验结果和三轴压缩试验结果进行对比分析，分析结果表明：按不排水剪强度考虑时，不同深度土体强度增长量的计算值与实测值之间的平均误差为8.0%；而按破坏面上的强度考虑时，不同深度土体强度增长量的计算值与实测值之间的平均误差为3.2%。因此，该解析解的计算值与实测结果较为吻合。

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关键词 ：地基基础, 砂井地基, 地下水位, 有效应力原理, 应力路径法, 有效应力唯一性理论, 强度增长解析解

Abstract：The actual development of shear strengths of soft soils in the thick hydraulic reclaimed foundations improved by the technology of pumped vacuuming combined with heaped preloading was qualitatively analyzed in terms of the principle of effective stresses and the method of stress paths. The development of soil shear strength under the groundwater level was found to be different from that of above the groundwater level. An analytical solution for soil shear strengths considering the effect of groundwater levels was therefore derived based on the theory of the uniqueness of effective stresses. The increments of soil shear strength at different depths after the dissipation of the excess pore water pressure under constant load in an area at Gaolan，Zhuhai seaport were calculated with the derived analytical solution. Comparisons with the results from the unconfined compression test and triaxial compression test revealed that the averaged error between the calculated and measured values is only 8.0% in terms of the undrained shear strength and is only 3.2% in terms of the shear strength in soil failure surface. Therefore，the calculated results based on the analytical solution agree well with the measured results.

Key words： foundation;sand drain foundation;ground water level;principle of effective stress;stress paths uniqueness of effective stress;analytical solution of strength increasing

收稿日期: 2013-06-18

引用本文:

鲍树峰1，2，3，莫海鸿1，董志良2，3，陈平山2，3. 考虑地下水位影响的砂井地基强度增长计算[J]. 岩石力学与工程学报, 2014, 33(6): 1269-1277.
BAO Shufeng1，2，3，MO Haihong1，DONG Zhiliang2，3，CHEN Pingshan2，3. INCREMENT CALCULATION OF SOIL SHEAR STRENGTH FOR SAND DRAIN FOUNDATIONS CONSIDERING GROUNDWATER LEVEL. , 2014, 33(6): 1269-1277.

链接本文:

http://www.rockmech.org/CN/Y2014/V33/I6/1269

[1]	赵令炜，沈珠江. 排水砂井预压法的理论与实践研究报告[R]. 南京：南京水利科学研究所，1963：25-30.(ZHAO Lingwei，SHEN Zhujiang. Theory and practice study for the preloading method with sand drains[R]. Nanjing：Nanjing Hydraulic Research Institute，1963：25-30.(in Chinese)) " target="_blank">
[8]	付天宇. 真空堆载联合预压下地基抗剪强度计算的研究[J]. 水运工程，2007，(11)：120-122.(FU Tianyu. On calculation method of ground shear strength under vacuum-surcharge preloading[J]. Port and Waterway Engineering，2007，(11)：120-122.(in Chinese)) " target="_blank">
[19]	RENDULIC L. Relation between void ratio and effective principal stresses for a remoulded silty clay[C]// Proceedings of 1st International Conference on Soil Mechanics and Foundation Engineering. [S. l.]：[s. n.]，1936：48-51. " target="_blank">
[21]	魏汝龙. 软黏土的强度与变形[M]. 北京：人民交通出版社，1987：38-40.(WEI Rulong. Strength and deformation of soft soil[M]. Beijing：China Communications Press，1987：38-40.(in Chinese)) " target="_blank">
[2]	沈珠江. 软土工程特性和软土地基设计[J]. 岩土工程学报，1998，20(1)：100-110.(SHEN Zhujiang. Engineering properties of soft soils and design of soft ground[J]. Chinese Journal of Geotechnical Engineering，1998，20(1)：100-111.(in Chinese))
[7]	麦远俭. 真空预压加固中软黏土不排水剪切强度的增长[J]. 水运工程，1998，(12)：53-57.(MAI Yuanjian. Total stress shear strength increment of soft clay under vacuum preloading[J]. Port and Waterway Engineering，1998，(12)：53-57.(in Chinese)) " target="_blank">
[9]	赵明华. 真空预压下土体强度增长机制及其计算方法研究[J]. 勘察科学技术，2006，(1)：3-5.(ZHAO Minghua. Study on mechanism and calculation of shear strength of soil body consolidated by vacuum preloading[J]. Investigation Science and Technology，2006，(1)：3-5.(in Chinese)) " target="_blank">
[11]	高海江，龚晓南，金小荣. 真空预压降低地下水位机制探讨[J]. 低温建筑技术，2005，(6)：97-99.(GAO Haijiang，GONG Xiaonan，JIN Xiaorong. Mechanism of groundwater declining in vacuum preloading[J]. Low Temperature Architecture Technology，2005，(6)：97-99.(in Chinese)) " target="_blank">
[12]	董志良. 堆载及真空预压法加固地基地下水位及测管水位高度的分析与计算[J]. 水运工程，2001，(8)：15-19.(DONG Zhiliang. Analysis and calculation of the soil foundation?s groundwater level and measuring tube?s water level under the situations of surcharge preloading and vacuum preloading[J]. Port and Waterway Engineering，2001，(8)：15-19.(in Chinese))
[14]	张功新，董志良，莫海鸿，等，真空预压中地下水位测试技术探讨与改进[J]. 岩土力学，2007，28(9)：1 899-1 903.(ZHANG Gongxin，DONG Zhiliang，MO Haihong，et a1. Discussion and reform of groundwater level measuring technique in soft soil reinforced by vacuum preloading[J]. Rock and Soil Mechanics，2007，28(9)：1 899- l 903.(in Chinese))
[16]	张庆生，汤连生，廖化荣，等. 真空预压下土体有效应力增量的计算与应用[J]. 岩石力学与工程学报，2006，25(增2)：3 565-3 571. (ZHANG Qinghua，TANG Liansheng，NIAO Huarong，et al. Calculation of incremental effective stress by vacuum preloading and its application to engineering[J]. Chinese Journal of Rock Mechanics and Engineering，2006，25(Supp.2)：3 565-3 571.(in Chinese)) " target="_blank">
[3]	沈珠江. 基于有效固结应力理论的粘土压力公式[J]. 岩土工程学报，2000，22(3)：353-356.(SHEN Zhujiang. Earth pressure of clay based on effective consolidation stress theory[J]. Chinese Journal of Geotechnical Engineering，2000，22(3)：353-356.(in Chinese))
[4]	曾国熙. = 0分析法——一种对于饱和黏性土值得推广应用的方法[J]. 地基处理，2001，12(3)：3-16.(ZENG Guoxi. On the application of = 0 analysis for saturated cohesive soils[J]. Ground Improvement，2001，12(3)：3-16.(in Chinese)) " target="_blank">
[5]	魏汝龙. 预压加固中软基的固结度和强度[C]// 第七届土力学及基础工程学术会议论文集. 北京：中国建筑工业出版社，1994：88-91.(WEI Rulong. Consolidation degree and strength of soft soil foundation under preloading[C]// Proceedings of the 7th Soil Mechanics and Foundation Engineering. Beijing：China Architecture and Building Press，1994：88-91.(in Chinese)) " target="_blank">
[6]	娄炎. 真空预压加固软基技术[M]. 北京：人民交通出版社，2001：12-48.(LOU Yan. Technique of vacuum preloading improving soft foundation[M]. Beijing：China Communications Press，2001：12-48.(in Chinese)) " target="_blank">
[10]	齐永正，赵维炳. 排水固结加固软基强度增长理论研究[J]. 水利水运工程学报，2008，2(6)：78-83.(QI Yongzheng，ZHAO Weibing. Study on theory of shear strength increment of soil body by draining consolidation for improving soft clay[J]. Hydro-Science and Engineering，2008，2(6)：78-83.(in Chinese))
[13]	明经平，赵维炳. 真空预压中地下水位变化的研究[J]. 水运工程，2005，(1)：1-6.(MING Jingping，ZHAO Weibing. Study on groundwater level in vacuum preloading[J]. Port and Waterway Engineering，2005，(1)：1-6.(in Chinese))
[17]	胡中雄. 土力学与环境土工学[M]. 上海：同济大学出版社，1997：127.(HU Zhongxiong. Soil mechanics and geotechnical environmental science[M]. Shanghai：Tongji University Press，1997：127.(in Chinese)) " target="_blank">
[20]	HENKEL D J. The shear strength of saturated remolded clays[C]// Proceedings of Research Conference on Shear Strength of Cohesive Soils. Colorado：ASCE，1960：533-554. " target="_blank">
[15]	刘汉龙，周琦，顾长存. 真空预压条件下地下水位测试新方法及其应用[J]. 岩土工程学报，2009，31(1)：48-51.(LIU Hanlong，ZHOU Qi，GU Changcun. New method for measuring groundwater under vacuum preloading[J]. Chinese Journal of Geotechnical Engineering，2009，31(1)：48-51.(in Chinese))
[18]	陈仲颐，周景星，王洪瑾. 土力学[M]. 北京：清华大学出版社，1994：182.(CHEN Zhongyi，ZHOU Jingxing，WANG Hongjin. Soil mechanics[M]. Beijing：Tsinghua University Press，1994：182.(in Chinese)) " target="_blank">