自重湿陷性黄土场地的水分运移规律研究

doi:10.13722/j.cnki.jrme.2015.1512

摘要
图/表
参考文献(18)
相关文章 (15)

全文: PDF (1817 KB) HTML (1 KB)
输出: BibTeX | EndNote (RIS)

摘要依托兰州和平镇大厚度自重湿陷性黄土场地上的大型原位浸水试验，分析TDR水分计实时记录的体积含水率变化数据，研究大厚度自重湿陷性黄土场地水分运移规律。结果表明：自重湿陷性黄土场地浸润区和饱和区均呈现类似椭圆状的形态，可能与试坑未设注水孔等因素有关。水分的扩散并不是沿着某一固定的浸润角向下入渗，早期浸润线基本上是直线入渗，随后过渡为椭圆状入渗。场地中竖向渗透要快于径向渗透，这与黄土的竖向节理结构有着密切联系。当水分运移至埋深较大的土层时，此时径向渗透作用加大，竖向渗透会变缓。湿润锋的竖径比在浸水开始时较大，随着浸水时间的增加湿润锋竖径比会迅速下降，当入渗锋到达15 m之后，竖径比减小并趋于缓和。竖向扩散系数基本呈现出幂函数减小形态，而径向扩散系数呈现“小–大–小”的变化规律，给出了竖向和径向扩散系数随浸水时间变化的数学表达式。研究结果为认识大厚度自重湿陷性黄土场地水分运移规律提供了坚实的试验基础，亦可以为进一步研究大厚度自重湿陷性黄土场地的湿陷变形规律提供科学依据。

	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
	苏立海1
	2
	姚志华2
	黄雪峰3
	李宁1
	屈耀辉4

关键词 ：土力学, 自重湿陷性黄土, 原位浸水试验, 水分运移, 湿润锋, 扩散系数

Abstract：On basis of a large-scale in-situ soaking test in a self weight collapsible loess ground located in Lanzhou City，Gansu Province，volumetric water content recorded in real-time by TDR water meters was analyzed to research water migration morphology in the self weight collapsible loess ground with heavy section. The results show that，infiltration zone and saturated zone similarly take on a elliptical shape in the self weight collapsible loess ground，which would be associated without water injection hole. Water migration is not downward with permanent infiltration angle. The phreatic line is basically linear in advance，then becomes elliptical infiltration. The vertical penetration is faster than the radial penetration. When the moisture penetrates into the deeper soil layer，that vertical penetration will decrease and the radial penetration will increase which would be associated with joint and fissure. Vertical-horizontal ration of wetting front is larger at the beginning of soaking test. With the increase of soaking time，the vertical-horizontal ration decreases rapidly. After the infiltration front reaches 15 m，the vertical-horizontal ration decreases gently. The vertical diffusion coefficient shows a decreasing form of basic power function，and the radial diffusion coefficient shows a variation of“small-big-small”. The mathematical expressions of vertical and radial diffusion coefficient with change of soaking time are given. Analysis results would provide a test foundation to know water migration regularity of self weight collapsible loess ground and some scientific basis for collapsible deformation in self weight collapsible loess area.

Key words： soil mechanics self weight collapse loess in-situ soaking test water migration wetting front diffusion coefficient

引用本文:

苏立海1，2，姚志华2，黄雪峰3，李宁1，屈耀辉4. 自重湿陷性黄土场地的水分运移规律研究[J]. 岩石力学与工程学报, 2016, 35(S2): 4328-4337.
SU Lihai1，2，YAO Zhihua2，HUANG Xuefeng3，LI Ning1，QU Yaohui4. Water migration regularity of self weight collapsible loess ground. , 2016, 35(S2): 4328-4337.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2015.1512 或 https://rockmech.whrsm.ac.cn/CN/Y2016/V35/IS2/4328

[1]	罗宇生. 湿陷性黄土地基评价[J]. 岩土工程学报，1998，20(4)：87-91.(LUO Yusheng. Assessment of collapsibility of collapsible loessfoundation[J]. Chinese Journal of Geotechnical Engineering，1998，20(4)：87-91.(in Chinese))
[2]	钱鸿缙，朱梅，谢爽. 河津黄土地基湿陷变形试验研究[J]. 岩土工程学报，1992，14(6)：1-9.(QIANHongjin，ZHU Mei，XIE Shuang. Experimental study on the regularities of collapsible deformation of loess foundation in Hejin，Shanxi[J]. Chinese Journal ofGeotechnical Engineering，1992，14(6)：1-9.(in Chinese))
[3]	汪国烈. 自重湿陷性黄土的试验研究(试坑浸水及载荷试验报告)[R]. 兰州：甘肃省建工一局建筑科学研究所，1975.(WANG Guolie. Test research on collapse loessunder overburden pressure[R]. Lanzhou：Gansu ProvinceBuilding Research Institute，1975.(in Chinese))
[4]	李大展，何颐华，隋国秀. Q2 黄土大面积浸水试验研究[J].岩土工程学报，1993，15(2)：1-11.(LI Dazhan，HE Yihua，SUI Guoxiu. Study and test on immersion of Q2loess inlarge area[J]. Chinese Journal of Geotechnical Engineering，1993，15(2)：1-11.(in Chinese))
[5]	黄雪峰，哈双，陈正汉，等. 大厚度自重湿陷性黄土场地湿陷变形特征的大型现场浸水试验研究[J]. 岩土工程学报，2006，28(3)：382-389.(HUANG Xuefeng，HA shuang，CHENZhenghan，etal. Large area field immersion test on characteristics ofdeformation of self weight collapse loess under overburden pressure[J]. Chinese Journal ofGeotechnical Engineering，2006，28(3)：382-389.(in Chinese) )
[6]	王小军，米维军，熊志文，等. 郑西客运专线黄土地基湿陷性现场浸水试验研究[J].铁道学报，2012，34(1)：83-90.(WANG Xiaojun，MI Weijun，XIONG Zhiwen，et al. Water immersion field tests of collapsibility of loess foundation of Zhengzhou-Xi¢an Passenger Dedicated Line[J]. Journal of the China Railway Society，2012，34(1)：83-90.(in Chinese))
[7]	王文焰，张建丰. 田间土壤入渗试验装置的研究[J]. 水土保持学报，1991，5(4)：38-44.(WANG Wenyan，ZHANG Jianfeng. Research on field soil water penetration testing device[J]. Journal of Soil and Water Conservation，1991，5(4)：38-44.(in Chinese))
[8]	孙西欢. 蓄水坑灌法及其水土保持作用[J].水土保持学报，2002，16(1)：130-131.(SUN Xihuan. Water storage pit irrigation and its
	effect on water and soil conservation[J]. Journal of Soil and Water Conservation，2002，16(1)：130-131.(in Chinese))
[9]	李明思，康绍忠，孙海燕. 点源滴灌滴头流量与湿润体关系研究[J]. 农业工程学报，2006，22(4)：32-35.(LI Mingsi，KANG Shaozhong，SUN Haiyan. Relationships between dripper discharge and soil wettingpattern for drip irrigation[J]. Transactions of the CSA E，2006，22(4)：32-35.(in Chinese))
[10]	汪志荣，王文焰，王全九. 点源入渗土壤水分运动规律实验研究[J]. 水利学报，2000，6(6)：39-44.(WANG Zhirong，WANG Wenyan，WANG Quanjiu. Experimental study on soil water movement from a point source[J]. Journal of Hydraulic Engineering，2000，6(6)：39-44.(in Chinese))
[11]	赵伟霞，蔡焕杰，陈新明，等. 无压灌溉土壤湿润体含水率分布规律与模拟模型研究[J]. 农业工程学报，2007，23(3)：7-12.(ZHAO Weixia，CAIHuanjie，CHEN Xinming，et al. Distribution rule o f soil moisture and simulation model in wettingfront under non-pressure irrigation[J]. Transactions of the CSAE，2007，23(3)：7-12.(in Chinese))
[12]	张振华，蔡焕杰，杨润亚，等. 地表积水条件下滴灌入渗特性研究[J]. 灌溉排水学报，2004，23(6)：1-4.(ZHANG Zhenhua，CAI Huanjie，YANG Runya，et al. Characteristic pattern of drip irrigation infiltration under surface ponding[J]. Journal of Irrigation and Drainage，2004，23(6)：1-4.(in Chinese))
[13]	黄雪峰，李佳，崔红，等. 非饱和原状黄土垂直高边坡潜在土压力原位测试试验研究[J]. 岩土工程学报，2010，(4)：500-506. (HUANGXuefeng，LIJia，CUI Hong，et al. Distribution characteristics of earth pressure for unsaturated intact loess[J]. Chinese Journal of Geotechnical Engineering，2010，(4)：500-506.(in Chinese))
[14]	黄雪峰，刘长玲，姚志华，等. 采用TDR 水分计研究非饱和黄土入渗及自重湿陷变形规律[J]. 岩石力学与工程学报，2012，31(增1)：3231-3238.(HUANG Xuefeng，LIU Changling，YAO Zhihua，et al. Study of infiltration and collapsible deformation law of unsaturated loess under over burden pressure by using TDR soil water probe[J]. Chinese Journal of Rock Mechanics and Engineering，2012，31(Supp.1)：3231-3238.(inChinese))
[15]	刘保健，谢永利，于友成. 黄土非饱和入渗规律原位试验研究[J]. 岩石力学与工程学报，2004，23(24)：4156-4160.(LIU Baojian，XIEYongli，YU Youcheng.In-situ testing study on infiltration in unsaturated loess[J].Chinese Journal of Rock Mechanics and Engineering，2004，23(24)：4156-4160.(inChinese))
[16]	马闫，王家鼎，彭淑君. 大厚度黄土自重湿陷性场地浸水湿陷变形特征研究[J]. 岩土工程学报，2013，36(3)：537-546.(MA Yan，WANG Jiading，PENG Shujun. Immersion tests on characteristics of deformation of self-weight collapsible loess under overburden pressure[J].Chinese Journalof Geotechnical Engineering，2013，36(3)：537-546.(inChinese))
[17]	姚志华，黄雪峰，陈正汉，等. 兰州地区大厚度自重湿陷性黄土场地浸水试验综合观测研究[J]. 岩土工程学报，2012，34(1)：65-74. (YAO Zhihua，HUANG Xuefeng，CHEN Zhenghan，et al. Comprehensive soaking tests on self-weight collapse loess with heavy section in Lanzhou region[J]. Chinese Journal of Geotechnical Engineering，2012，34(1)：65-74.(in Chinese))
[18]	汪国烈，明文山. 湿陷性黄土的浸水变形规律与工程对策[C]//湿陷性黄土研究与工程(第四届全国黄土学术会议论文集).北京：中国建筑出版社，2001：21-32.(WANG Guolie，MING Wenshan. Immersion deformation ofcollapse loess and Engineering technologies[C]//Researchand Engineering of Collapsed Loess. Beijing：ChinaArchitecture and Building Press，2001：21-32.(inChinese))