排水条件对不同固结度软黏土动力特性影响试验研究

doi:10.11779/CJGE201505015

摘要
图/表
参考文献
相关文章 (15)

全文: PDF (605 KB) HTML (1 KB)
输出: BibTeX | EndNote (RIS)

摘要地铁隧道下卧土层由于施工扰动通常存在不同固结度,列车荷载下土体应变规律也有所差异,进而产生不均匀沉降。通过室内动三轴试验系统对杭州饱和软黏土进行动力测试,研究了排水条件、固结度、振动次数对软黏土动孔压和应变的影响,在试验和现有研究成果的基础上建立了考虑初始固结度、振动次数、排水条件的应变软化模型。结果表明：固结度愈高的土体,孔压发展愈缓慢,并且随振动次数增加,在较低的孔压水平就可达到稳定,排水条件下的孔压发展规律可由不排水试验获取。土体应变随循环次数的增加而增加,随固结度的增加而降低;提出的应变模型考虑了荷载循环过程中土体的排水,可以较好地模拟不同固结度下饱和软黏土的应变发展规律。

	服务

	把本文推荐给朋友
	加入我的书架
	加入引用管理器
	E-mail Alert
	RSS
	作者相关文章
	丁智
	张涛
	魏新江
	张孟雅

关键词 ：饱和软黏土, 固结度, 排水条件, 孔压, 应变

Abstract：The underlying soil, which is disturbed by subway tunneling, will show a different degree of consolidation which is associated with the strain of soil, and thus cause uneven settlement. Hangzhou saturated soft clay is studied using a dynamic triaxial test system to find the effects of drainage conditions, degrees of consolidation and cyclic times on dynamic pore pressure and strain. A new strain-degradation model considering degrees of initial consolidation, cyclic stress ratios and drainage conditions is proposed on the basis of the experiments and the existing research findings. The results show that the higher the degree of consolidation, the slower the increase of the pore pressure. Furthermore, the pore pressure will be stabilized at a lower level with the increment of cyclic times, and the law of pore pressure under drainage conditions may be obtained from undrained tests. The dynamic strain increases with the increase of the cyclic times and decreases with the decrease of the degrees of consolidation. The proposed strain model considers the drainage of the soil during the loading cycles, and it can well simulate dynamic strain changes under different degrees of consolidation.

Key words： saturated soft clay degree of consolidation drainage condition pore pressure strain

收稿日期: 2014-04-22

基金资助:国家自然科学基金项目（51278463）; 杭州市科技计划项目（20130533B28）

作者简介: 丁智（1983- ）,男,安徽铜陵人,博士,讲师,主要从事地铁施工及运营对周边环境影响方面的研究与教学工作。E-mail: dingz@zucc.edu.cn

引用本文:

丁智, 张涛, 魏新江, 张孟雅. 排水条件对不同固结度软黏土动力特性影响试验研究[J]. 岩土工程学报, 2015, 37(5): 893-899. DING Zhi, ZHANG Tao, WEI Xin-jiang, ZHANG Meng-ya. Experimental study on effect of different drainage conditions on dynamic characteristics of soft clay under different degrees of consolidation. Chinese J. Geot. Eng., 2015, 37(5): 893-899.

链接本文:

http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/10.11779/CJGE201505015 或 http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/Y2015/V37/I5/893

[1] 王常晶, 姬美秀, 陈云敏. 列车荷载作用下饱和软黏土地基的附加沉降[C]// 中国土木工程学会第九届土力学及岩土工程学术会议论文集. 北京: 清华大学出版, 2003: 1118-1122. (WANG Chang-jing, JI Mei-xiu, CHEN Yun-min. Train-load-induced settlements of soft clay subgrade[C]// Proceedings of 9th Chinese National Conference on Soil Mechanics and Geotechnical Engineering. Beijing: Tsinghua University Press, 2003: 1118-1122. (in Chinese))
[2] 叶耀东, 朱合华, 王如路. 软土地铁运营隧道病害现状及成因分析[J]. 地下空间与工程学报, 2007, 3(1): 157-160, 166. (YE Yao-dong, ZHU He-hua, WANG Ru-lu. Analysis on the current status of metro operating tunnel damage in soft ground and its causes[J]. Chinese Journal of Underground Space and Engineering, 2007, 3(1): 157-160, 166. (in Chinese))
[3] 陈德智. 广州地铁隧道运营期沉降监测及分析[J]. 都市快轨交通, 2011, 24(4): 94-98. (CHEN De-zhi. Subsidence monitoring and analysis for Guangzhou subway tunnels[J]. Urban Rapid Rail Transit, 2011, 24(4): 94-98. (in Chinese))
[4] 葛世平, 廖少明, 陈立生, 等. 地铁隧道建设与运营对地面房屋的沉降影响与对策[J]. 岩石力学与工程学报, 2008, 27(3): 550-556. (GE Shi-ping, LIAO Shao-ming, CHEN Li-sheng, et al. Influence of construction and operation of metro tunnel on settlement of ground buildings and countermeasures[J]. Chinese Journal of Rock Mechanics and Engineering, 2008, 27(3): 550-556. (in Chinese))
[5] 周建. 循环荷载作用下饱和软黏土特性研究[D]. 杭州: 浙江大学, 1998. (ZHOU Jian. Properties of saturated clay under cyclic loading[D]. Hangzhou: Zhejiang University, 1988. (in Chinese))
[6] EIGENBROD K D, GRAHAM J, BURAK J P. Influence of cycling pore-water pressures and principal stress ratios on drained deformations in clay[J]. Canadian Geotechnical Journal, 1992, 29(2): 326-333.
[7] 张茹, 何昌荣, 费文平, 等. 固结应力比对土样动强度和动孔压发展影响规律的影响[J]. 岩土工程学报, 2006, 28(1): 101-105. (ZHANG Ru, HE Chang-rong, FEI Wen-ping, et al. Effect of consolidation stress ratio on dynamic strength and dynamic pore water pressure of soil[J]. Chinese Journal of Geotechnical Engineering, 2006, 28(1): 101-105. (in Chinese))
[8] HYODO M, YASUHARA K, HIRAO K. Prediction of clay behaviour in undrained and partially drained cyclic triaxial tests[J]. Soils and Foundations, 1992, 32(4): 117-127.
[9] 王军, 蔡袁强, 郭林, 等. 分阶段循环加载条件下温州饱和软黏土孔压和应变发展规律[J]. 岩土工程学报, 2012, 34(7): 1349-1354. (WANG Jun, CAI Yuan-qiang, GUO Lin, et al. Pore pressure and strain development of Wenzhou saturated soft soil under cyclic loading by stages[J]. Chinese Journal of Geotechnical Engineering, 2012, 34(7): 1349-1354. (in Chinese))
[10] MONISMITH C L, OGAWA N, FREEME C R. Permanent deformation characteristics of subgrade soils due to repeated loading[J]. Transportation Research Record, 1975, 537: 1-17.
[11] LI D, SELIG E T. Cumulative plastic deformation for fine-grained subgrade soils[J]. Journal of Geotechnical Engineering, 1996, 122(12): 1006-1013.
[12] CHAI J C, MIURA N. Traffic-load-induced permanent deformation of road on soft subsoil[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2002, 128(11): 907-916.
[13] PUPPALA A J, MOHAMMAD L N, ALLEN A. Permanent deformation characterization of subgrade soils from RLT test[J]. Journal of Materials in Civil Engineering, 1999, 11(4): 274-282.
[14] 陈颖平, 黄博, 陈云敏. 循环荷载作用下软黏土不排水累积变形特性[J]. 岩土工程学报, 2008, 30(5): 764-768. (CHEN Ying-ping, HUANG Bo, CHEN Yun-min. Reliability analysis of high level backfill based on chaotic optimization[J]. Chinese Journal of Geotechnical and Engineering, 2008, 30(5): 764-768. (in Chinese))
[15] 黄茂松, 李进军, 李兴照. 饱和软黏土的不排水循环累积变形特性[J]. 岩土工程学报, 2006, 28(7): 891-895. (HUANG Mao-song, LI Jin-jun, LI Xing-zhao.Cumulative deformation behavior of soft clay in cyclic undtained tests[J]. Chinese Journal of Geotechnical and Engineering, 2006, 28(7): 891-895. (in Chinese))
[16] 龚晓南. 土力学[M]. 北京: 中国建筑工业出版社, 2002. (GONG Xiao-nan. Soil mechanics[M]. Beijing: China Architecture and Building Press, 2002. (in Chinese))
[17] 王常晶, 陈云敏. 交通荷载引起的静偏应力对饱和软黏土不排水循环性状影响的试验研究[J]. 岩土工程学报, 2007, 29(11): 1742-1747. (WANG Chang-jing, CHEN Yun-min. Study on effect of traffic loading induced static deviator stress on undrained cyclic properties of saturated soft clay[J]. Chinese Journal of Geotechnical and Engineering, 2007, 29(11): 1742-1747. (in Chinese))
[18] 黄博, 丁浩, 陈云敏. 高速列车荷载作用的动三轴实验模拟[J]. 岩土工程学报, 2011, 33(2): 195-202. (HUANG Bo, DING Hao, CHEN Yun-min. Simulation of high-speed train load by dynamic triaxial tests[J]. Chinese Journal of Geotechnical Engineering, 2011, 33(2): 195-202. (in Chinese))
[19] 魏新江, 张涛, 丁智, 等. 地铁荷载下不同固结度软黏土的孔压试验模型[J]. 岩土力学, 2014, 35(10): 2761-2768. (WEI Xin-jiang, ZHANG Tao, DING Zhi, et al. Experimental study of pore pressure model of soft clay with different consolidation degrees under subway loading[J]. Rock and Soil Mechanics, 2014, 35(10): 2761-2768. (in Chinese))
[20] HYDE A F L, BROWN S F. The plastic deformation of a silty clay under creep and repeated loading[J]. Géotechnique, 1976, 26(1): 173-184.