›› 2016, Vol. 37 ›› Issue (S2): 243-249.doi: 10.16285/j.rsm.2016.S2.029

• 基础理论与实验研究 • 上一篇    下一篇

钱塘江冲海积粉土渗透破坏试验研究

杨迎晓1, 2,龚晓南2,周春平3,金兴平4   

  1. 1.浙江树人大学 城建学院,浙江 杭州 310015;2.浙江大学 滨海和城市岩土工程研究中心,浙江 杭州 310058; 3.浙江中材工程勘测设计有限公司,浙江 杭州 310022;4.杭州市城市建设发展有限公司,浙江 杭州 310001
  • 收稿日期:2016-04-09 出版日期:2016-11-11 发布日期:2018-06-09
  • 作者简介:杨迎晓,女,1963年生,博士,教授,主要从事土力学的研究与教学工作。
  • 基金资助:
    国家自然科学基金(No.51338009);国家大学生创新训练计划项目(No.201511842003);浙江省科技计划项目(No.2008C33002);浙江省大学生科技创新活动计划(新苗人才计划)(No.2013R420018)。

Experimental study of seepage failure of Qiantang River alluvial silts

YANG Ying-xiao1, 2, GONG Xiao-nan2, ZHOU Chun-ping 3, JING Xing-ping4   

  1. 1. Urban Construction College, Zhejiang Shuren University, Hangzhou, Zhejiang 310015, China; 2. Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou, Zhejiang 310058, China; 3. Zhejiang Zhongcai Engineering Survey Design Co., Ltd., Hangzhou, Zhejiang 310022, China; 4. Hangzhou Urban Construction and Development Co., Ltd., Hangzhou, Zhejiang 310001, China
  • Received:2016-04-09 Online:2016-11-11 Published:2018-06-09
  • Supported by:
    This work was supported by the National Natural Science Foundation of China(51338009), National Training Program of Innovation and Entrepreneurship for Undergraduates(201511842003),Science and technology project of Zhejiang Province(2008C33002), and Students in Zhejiang Province Science and Technology Innovation Plan(Xinmiao Talents Program) (2013R420018).

摘要: 钱塘江冲海积粉土以砂质粉土为主,呈“高粉性、低黏性”的地区特点,在地下水动水压力作用下极易产生渗透破坏。粉土是介于砂性土和黏性土之间的一种过渡类型土,工程性质既与砂性土不同又与黏性土有较大区别。采用自行研制的粉土抗渗强度测定设备,对钱塘江冲海积粉土5种典型样本和微层理原状样本进行了渗透稳定试验。结果表明,钱塘江冲海积粉土渗透稳定性差,抗渗强度低;砂质粉土临界水力比降icr为1.01~1.25,破坏形式为局部流土,从临界水力比降icr发展到破坏比降iF的过程是瞬间的,基坑开挖遇到该类土层极易产生渗透破坏;黏质粉土临界水力比降icr随黏粒含量增加而增加,从临界水力比降icr发展到破坏比降iF有个短暂的过程,是整体流土破坏;钱塘江冲海积粉土渗透稳定各向异性;渗流垂直微层理方向的临界水力比降icr最大,是渗流沿微层理方向icr的2.5倍左右。研究结果为粉土地基渗透破坏防治提供参考。

关键词: 钱塘江冲海积粉土, 渗透变形, 渗透破坏, 临界水力比降

Abstract: Qiangtang alluvial layers are mainly composed of sandy silt and have “highly silty and weakly clayey” characteristics. Seepage failures can be easily induced in these layers by the hydrodynamic pressure of underground water. Silt is a kind of complex transitional soil between sand and clay; and its property is different from both sand and clay. Seepage stability tests are conducted with the testing apparatus developed by authors on samples of five typical types of silt in Qiangtang alluvial layers (including sandy silt and clayey silt) as well as samples of undisturbed soil with horizontal beddings. The results of the tests show that Qiantang alluvial silt has poor seepage stability and low impermeability. In terms of the sandy silt from Qiangtang alluvial layers. (1) The critical hydraulic gradient (icr) of sandy silt ranges from 1.01 to 1.25. (2) It turns into local flowing soil when failure occurs. (3) Its transition from the critical state to the failure state occurs instantaneously; and thus deep excavation in such sandy silt layers can very easily cause seepage failure. As with the Qiangtang clayey silt. (1) Its critical hydraulic gradient increases with the content of clay. (2) Its transition from the critical state to the failure state is relatively slow compared to the sandy silt. (3) It fails in the form of whole flowing soil. The tests also reveal that the seepage stability of Qiantang alluvial layers is anisotropic. The seepage perpendicular to the horizontal beddings has the maximum icr, which is about 2.5 times the icr of the seepage parallel with the beddings. The research provides more knowledge on the prevention of silt seepage failure.

Key words: Qiantang alluvial silt, seepage deformation, seepage failure, critical hydraulic gradient

中图分类号: 

  • TU 443
[1] 袁 涛,蒋中明,刘德谦,熊小虎,. 粗粒土渗透损伤特性试验研究[J]. , 2018, 39(4): 1311-1316.
[2] 黄 达 ,曾 彬 ,顾东明,. 基于Copula理论的粗粒土渗透破坏临界水力比降估值[J]. , 2015, 36(5): 1253-1260.
[3] 陈 群,刘 黎,何昌荣,朱分清. 缺级粗粒土管涌类型的判别方法[J]. , 2009, 30(8): 2249-2253.
[4] 张家发,定培中,张 伟,胡智京. 水布垭面板堆石坝垫层料渗透与渗透变形特性试验研究[J]. , 2009, 30(10): 3145-3150.
[5] 周晓杰,介玉新,李广信1. 基于渗流和管流耦合的管涌数值模拟[J]. , 2009, 30(10): 3154-3158.
[6] 冉 龙,胡 琦. 粉砂地基深基坑渗透破坏研究[J]. , 2009, 30(1): 241-245.
[7] 胡 琦,凌道盛,陈仁朋,陈云敏,贾官伟. 粉砂地基深基坑工程土体渗透破坏机理及其影响研究[J]. , 2008, 29(11): 2967-2972.
[8] 夏艳华,白世伟,张 超. 某水利枢纽厂房基坑开挖渗透变形评估[J]. , 2007, 28(11): 2435-2439.
[9] 周 健,姚志雄, 江建洪. 渗透破坏若干问题的解析解及机理分析[J]. , 2006, 27(S2): 55-60.
[10] 邢万波 ,徐卫亚 ,魏文白 ,王 凯 ,闫 旭,. 板桥河左岸堤防渗透破坏风险分析[J]. , 2006, 27(8): 1272-1276.
[11] 罗长军 ,胡 峰 ,张磊奇 ,王会午,. 陡坡水库大坝渗透稳定性及渗透变形分析[J]. , 2006, 27(8): 1305-1311.
[12] 钱玉林. 筑堤土防渗性状试验研究[J]. , 2004, 25(5): 824-826.
[13] 金仁祥. 某水库坝基渗透稳定性研究[J]. , 2004, 25(1): 157-159.
[14] 刘建刚,陈建生,焦月宏,赵维炳. 双层结构堤基渗透变形发展过程的数值模拟[J]. , 2002, 23(6): 706-708.
Viewed
Full text


Abstract

Cited

  Shared   
  Discussed   
No Suggested Reading articles found!