双层地基水平排水砂垫层位置优化研究

doi:10.16285/j.rsm.2019.0127

岩土力学 ›› 2020, Vol. 41 ›› Issue (2): 437-444.doi: 10.16285/j.rsm.2019.0127

双层地基水平排水砂垫层位置优化研究

李红坡^{1, 2, 3}，陈征⁴，冯健雪^{1, 2, 3}，蒙宇涵^{1, 2, 3}，梅国雄^{1, 2, 3}

1. 广西大学工程防灾与结构安全教育部重点实验室，广西南宁 530004；2. 广西大学广西防灾减灾与工程安全重点实验室，广西南宁 530004； 3. 广西大学土木建筑工程学院，广西南宁 530004；4. 武汉大学水工岩石力学教育部重点实验室，湖北武汉 430072

收稿日期:2019-03-11 修回日期:2019-05-08 出版日期:2020-02-11 发布日期:2020-02-08
通讯作者: 梅国雄，男，1975年生，博士，教授，从事固结理论和土体基本性质等研究。E-mail: meiguox@163.com E-mail:li1994813@126.com
作者简介:李红坡，男，1994年生，硕士研究生，主要从事软土地基固结理论方面的研究工作
基金资助:
国家自然科学基金（No. 51578164，No. 41672296，No. 51878185）；广西自然科学基金创新研究团队项目（No. 2016GXNSFGA380008）；中国国家留学基金（No. 201906660001）

Study on position optimization of horizontal drainage sand blanket of double-layer foundation

LI Hong-po^{1, 2, 3}, CHEN Zheng⁴, FENG Jian-xue^{1, 2, 3}, MENG Yu-han^{1, 2, 3}, MEI Guo-xiong^{1, 2, 3}

1. Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education, Guangxi University, Nanning, Guangxi 530004, China; 2. Guangxi Key Laboratory of Disaster Prevention and Structural Safety, Guangxi University, Nanning, Guangxi 530004, China; 3. College of Civil Engineering and Architecture, Guangxi University, Nanning, Guangxi 530004, China; 4. Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering of Ministry of Education, Wuhan University, Wuhan, Hubei 430072, China

Received:2019-03-11 Revised:2019-05-08 Online:2020-02-11 Published:2020-02-08
Supported by:
This work was supported by the National Natural Science Foundation of China(51578164, 41672296, 51878185), the Innovation Research Team Program of Guangxi Natural Science Foundation (2016GXNSFGA380008) and the China Scholarship Council (CSC) (201906660001).

摘要/Abstract

摘要： 针对吹填土地基内水平排水砂垫层位置的优化问题，考虑双层地基内设置单一砂垫层的情况，采用分离变量法求出了地基超静孔压和平均固结度的解析解答，通过解答退化和有限元方法验证了解答的正确性，并讨论了下层与上层地基的渗透系数之比a、体积压缩系数之比b和厚度之比c对砂垫层最优位置的影响，最后通过算例对比了砂垫层设置在不同位置时地基的固结效率。结果表明：同一时间因数下，下层与上层地基的渗透系数之比 1时，砂垫层的最优位置随着a的增大逐渐向下移动， 1时，则相反；下层与上层地基的体积压缩系数之比 1时，砂垫层的最优位置随着b的增大逐渐向下移动， 1时，则相反；下层地基的固结系数较大时，在固结前期，砂垫层的最优位置随着下层与上层地基厚度之比c的增大逐渐向上移动，在固结后期则相反。算例计算结果显示：地基固结度达到90%时，砂垫层设置在最优位置相比未铺设砂垫层能节省大量时间。

关键词: 双层地基, 水平排水砂垫层, 渗透系数, 砂垫层最优位置

Abstract: To analyze the optimal position of horizontal drainage sand blanket in reclaimed foundation, the case that a double-layer foundation with placement of a single sand blanket is considered, using the method of separation of variables, and the analytical solution of excess pore-water pressure and average degree of consolidation is obtained. Their validity is verified by degeneration and finite element method. The effects of the lower foundation permeability coefficient to the upper foundation permeability coefficient ratio (a), the lower foundation volumetric compression coefficient to the upper foundation volumetric compression coefficient ratio (b) and the lower foundation thickness to upper foundation thickness ratio (c) on the optimal position of the sand blanket are discussed. Finally, an example is given to demonstrate different consolidation efficiencies of the foundation when the sand blanket is placed at different positions. The results show that at the same time factor, when 1, the optimal position of the sand blanket moves downward with the increase of a, but when 1, the opposite becomes the case. The optimal position of the sand blanket moves downward with the increase of b when 1, and when 1, the opposite becomes the case. When the consolidation coefficient of the lower foundation is greater than that of the upper foundation, the optimal position of the sand blanket moves upward with the increase of c in the early stage of consolidation, and the opposite becomes the case in the later stage of consolidation. The calculation results show that when the average degree of consolidation of foundation reaches 90%, the sand blanket is placed at the optimal position, which saves a lot of time compared with the unpaved sand blanket.

Key words: double-layer foundation, horizontal drainage sand blanket, permeability coefficient, optimal position of sand blanket

中图分类号:

TU 449

李红坡, 陈征, 冯健雪, 蒙宇涵, 梅国雄, . 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 Hong-po, CHEN Zheng, FENG Jian-xue, MENG Yu-han, MEI Guo-xiong, . Study on position optimization of horizontal drainage sand blanket of double-layer foundation[J]. Rock and Soil Mechanics, 2020, 41(2): 437-444.

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双层地基水平排水砂垫层位置优化研究

Study on position optimization of horizontal drainage sand blanket of double-layer foundation

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