黄土丘陵沟壑区压实回填土地基沉降计算方法

孔洋; 阮怀宁; 黄雪峰

doi:10.11779/CJGE2018S1035

黄土丘陵沟壑区压实回填土地基沉降计算方法 English Version

1. 河海大学岩土力学与堤坝工程教育部重点实验室,江苏南京 210098;
2. 兰州理工大学土木工程学院,甘肃兰州 730050

基金项目: 中央高校基本科研业务费专项资金项目（2016B43414）

详细信息

作者简介:
孔洋(1989- ),男,山东泰安人,博士研究生,主要从事特殊土工程性状与节理岩体水力特性方面的研究。E-mail: gongzuo99033@163.com。

中图分类号: TU444
计量
- 文章访问数: 288
- HTML全文浏览量: 4
- PDF下载量: 126
出版历程
- 收稿日期: 2017-06-10
- 发布日期: 2018-08-24

Method for calculating foundation settlement of compacted backfill in hilly and gully regions of loess

1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Nanjing 210098, China;
2. College of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China

摘要

摘要: 沟谷型黄土高填方工程地基沉降控制问题既是重点也是难点,针对黄土丘陵沟壑区压实回填土地基沉降计算方法研究较少。通过室内人工配制试样与回填场地原位探井取样开展了一系列室内高、中、低压侧限压缩固结试验,探究了压实回填土的变形特性,基于割线模量法与分层总和法研究路径的不同提出了一种改进的沉降计算方法,对比分析了填筑体在不同计算方法下的最终沉降量差异。试验结果发现,采用基于Gunary模型非线性垂直压应力-压应变关系表示的割线模量法,计算所得的最终沉降量数值比分层总和法计算值偏小,两者偏差在4.8%之内。压实回填试验场地的实测压实度基本稳定在（70±5）%,通过提出的计算方法预测回填场地33 m深填方填筑体在水环境未变化时产生的总压缩固结沉降变形量为1523.2 mm,填方区的地基沉降量非常大,填方区的基础设施建设应在地基充分固结变形稳定后,同时,高填方施工应严格控制压实度,努力提升施工质量。该计算方法是对割线模量法沉降计算体系的有益补充,其计算结果可供实际工程建设参考。
- 黄土 /
- 丘陵沟壑区 /
- 回填土 /
- 高填方 /
- 地基沉降
Abstract: The problem of foundation settlement control of high loess filled projects is important and difficult. Because of the lack of researches on methods for calculating settlement of compacted backfill foundation of high embankments in hilly and gully regions of loess, a series of indoor confined consolidation experiments using indoor artificial test samples and field samples are carried out. The deformation characteristics of compacted backfill loess are studied. Based on the different research paths of the secant modulus method and the stratified summation method, a modified foundation settlement method is proposed. The differences of the final settlements under different methods are compared and analyzed. The results show that the calculated values by the secant modulus method based on the vertical stress - strain relation of Gunary Model are smaller than those based on the stratified method, and the difference range is within 4.8%. The compactness of backfill loess is basically stable in (70±5) %. In fact, it is a very low compactness. The final compression and consolidation settlement of the 33 m-deep test site is predicted by the proposed method, and it is 1523.2 mm. The infrastructure construction in backfill area should be carried out after full consolidation of the foundation. In the meanwhile, the compactness should be strictly controlled during construction of high embankments, and the quality of construction should be improved. The new foundation settlement is a useful supplement to the computational system of secant modulus method in settlement calculation, and the calculated results are available to guide the construction and design of practical projects.
- loess /
- hilly and gully region /
- backfill /
- high embankment /
- foundation settlement

HTML全文

参考文献(17)

[1]	常茂德, 郑新民, 柏跃勤, 等. 黄土丘陵沟壑区小流域坝系相对稳定及水土资源开发利用研究[M]. 郑州: 黄河水利出版社, 2007. (CHANG Mao-de, ZHENG Xin-min, BAI Yue-qin, et al.Study on the relative stability of the dam system and the development and utilization of water and soil resources in the small watershed of the loess hilly gully region[M]. Zhengzhou: Yellow River Water Conservancy Press, 2007. (in Chinese))
[2]	蔡怀恩, 张继文, 秦广平. 浅谈延安黄土丘陵沟壑区地形地貌及工程地质分区[J]. 土木工程学报, 2015(增刊2): 386-390. (CAI Huai-en, ZHANG Ji-wen, QIN Guang-ping.Simple discuss on topography and engineering geology zoning in loess hilly gully region of Yan'an[J]. China Civil Engineering Journal, 2015(S2): 386-390. (in Chinese))
[3]	刘保健, 张军丽. 土工压缩试验成果分析方法与应用[J]. 中国公路学报, 1999, 12(1): 37-41. (LIU Bao-jian, ZHANG Jun-li.Application and analyzing method for soil compression test[J]. China Journal of Highway and Transport, 1999, 12(1): 37-41, 100. (in Chinese))
[4]	张茂花, 谢永利, 刘保健. 增(减)湿时黄土的压缩变形特性分析[J]. 湖南科技大学学报(自然科学版), 2007, 22(3): 50-55. (ZHANG Mao-hua, XIE Yong-li, LIU Bao-jian.Analysis of compression deformation characteristics of loess during moistening and demoistening process[J]. Journal of Hunan University of Science & Technology (Natural Science Edition), 2007, 22(3): 50-55. (in Chinese))
[5]	陈开圣, 沙爱民. 压实黄土变形特性[J]. 岩土力学, 2010, 31(4): 1023-1029. (CHEN Kai-sheng, SHA Ai-min.Study of deformation characteristic of compacted loess[J]. Rock and Soil Mechanics, 2010, 31(4): 1023-1029. (in Chinese))
[6]	胡长明, 梅源, 王雪艳. 吕梁地区压实马兰黄土变形与抗剪强度特性[J]. 工程力学, 2013, 30(10): 108-114. (HU Chang-ming, MEI Yuan, WANG Xue-yan.Deformation and shearing strength characteristic of compacted Malan loess in Lvliang region[J]. Engineering Mechanics, 2013, 30(10): 108-114. (in Chinese))
[7]	黄雪峰, 孔洋, 李旭东, 等. 压实黄土变形特性研究与应用[J]. 岩土力学, 2014(增刊2): 37-44. (HUANG Xue-feng, KONG Yang, LI Xu-dong, et al.Study and application of deformation characteristics of compacted loess[J]. Rock and Soil Mechanics, 2014(S2): 37-44. (in Chinese))
[8]	张俊. 高填方黄土路基沉降规律研究[D]. 西安: 长安大学, 2004. (ZHANG Jun.Study on settlement law of high filled subgrade[D]. Xi'an: Chang'an University, 2004. (in Chinese))
[9]	资建民. 高填方路基快速施工与沉降控制研究[D]. 武汉:华中科技大学, 2008. (ZI Jian-min.Research on rapid construction and settlement control of high filled subgrade[D]. Wuhan: Huazhong University of Science and Technology, 2008. (in Chinese))
[10]	崔晓如. 高填方路基沉降变形分析与预测及其控制标准研究[D]. 长沙: 长沙理工大学, 2010. (CUI Xiao-ru.Study on settlement of high embankment on analysis and forecast and settlement control standards[D]. Changsha: Changsha University of Science & Technology, 2010. (in Chinese))
[11]	LANCELLOTTA R, PREZIOSI L.A general nonlinear mathematical model for soil consolidation problems[J]. International Journal of Engineering Science, 1997, 35(10): 1045-1063.
[12]	BASMA A A, KALLAS N.Modeling soil collapse by artificial neural networks[J]. Geotechnical and Geological Engineering, 2004, 22(3): 427-438.
[13]	杨晶, 白晓红. 压实黄土非线性压缩应力-应变关系在地基沉降计算中的应用[J]. 岩土力学, 2015, 36(4): 1002-1008. (YANG Jing, BAI Xiao-hong.Nonlinear compression stress-strain relationship of compacted loess and its application to calculation of foundation settlement[J]. Rock and Soil Mechanics, 2015, 36(4): 1002-1008. (in Chinese))
[14]	MEERSCHAERT M M.Mathematical modeling fourth edition[M]. Beijing: China Machine Press, 2014.
[15]	丁洲祥, 龚晓南, 李又云, 等. 割线模量法在沉降计算中存在的问题及改进探讨[J]. 岩土工程学报, 2005, 27(3): 313-316. (DING Zhou-xiang, GONG Xiao-nan, LI You-yun, et al.Study on some problems of settlement calculation with secant modulus method and its modification[J]. Chinese Journal of Geotechnical Engineering, 2005, 27(3): 313-316. (in Chinese))
[16]	杨晶, 白晓红. 对采用割线模量法进行沉降计算所存在问题的探讨[J]. 太原理工大学学报, 2014, 45(3): 274-277. (YANG Jing, BAI Xiao-hong.Study on some problems of settlement calculation with secant modulus method[J]. Journal of Taiyuan University of Technology, 2014, 45(3): 274-277. (in Chinese))
[17]	董琪, 段旭, 李阳, 等. 黄土沟壑高填方工后12个月沉降变形规律研究[J]. 煤田地质与勘探, 2016, 44(2): 89-95, 105.(DONG Qi, DUAN Xu, LI Yang, et al. Subsidence deformation law of high embankment after 12 months in loess ravine[J]. Coal Geology & Exploration, 2016, 44(2): 89-95, 105. (in Chinese))