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

姚志华; 黄雪峰; 陈正汉; 张建华

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 English Version

1. 解放军后勤工程学院建筑工程系，重庆 401331 ； 2. 兰州理工大学土木工程学院，甘肃兰州 730050 ； 3. 中煤邯郸设计工程有限责任公司，河北邯郸 056031

基金项目: 国家自然科学基金项目(11072265)；国家电网公司科学技术项目（ SGKJJSKF[2008]656 ）；重庆市科委自然科学基金项目（2009BB6174）

详细信息

作者简介:
姚志华( 1983 – ) ，男，甘肃成县人，博士研究生，主要从事特殊土地基处理和非饱和土本构关系等方面研究工作。

中图分类号: TU444
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出版历程
- 收稿日期: 2011-05-19
- 发布日期: 2012-01-19

Comprehensive soaking tests on self-weight collapse loess with heavy section in Lanzhou region

1. Department of Architectural Engineering, Logistical Engineering University of PLA, Chongqing 401331, China ; 2. School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China ; 3. Handan Design Engineering China Coal Co., Ltd., Handan 056031, China)

摘要

摘要: 对兰州地区 Q₃ 大厚度自重湿陷性黄土场地进行了不设注水孔，埋设水分计和热传导吸力探头的浸水试验。研究结果表明：大厚度黄土场地的不同深度土层均会出现多次湿陷，湿陷次数随着土层深度的增加将减少；体积含水率在不同深度土层中呈现不同的变化规律， 10 m 以上基本由 6 段组成， 10 ～ 22.5 m 由 5 段组成，而 22.5 m 以下则由 3 段组成； 25 m 以上范围内水分入渗较为容易，该深度以下土层，由于上部土体发生湿陷压密以及空隙中的气体压力增大导致了水分入渗缓慢；离试坑周边较远的裂缝的产生由于试坑较近裂缝剧烈活动引起；水分运移基本呈现椭圆状形态入渗（长轴位于水平向），后期整个椭圆状湿润区的离心率越来越小，椭圆更扁；浸润角随着外部水源不断供给逐渐扩大，本次试验其变化范围在 0 °～ 55 °；场地中水分入渗率基本呈现出幂函数减趋势。
- 大厚度自重湿陷性黄土 /
- 浸水试验 /
- 体积含水率 /
- 吸力 /
- 渗透 /
- 浸润角
Abstract: Soaking tests on self-weight collapse Q3 loess with heavy section located in Lanzhou region are conducted without water injection hole and with moisture meter and heat conduction suction probe embedded. The test results indicate that multiple collapses appear in different soil layers at different depths, and the times of the collapses decrease with the increase of loess depth. The volumetric water content at different depths has different rules: the curve above 10 m in depth is made up of 6 stages, that between 10 m and 22.5 m in depth has 5 stages, and that beneath 22.5 m in depth has 3 stages. The water above 25 m in depth infiltrates easily, and the water beneath 25 m in depth infiltrates slowly because the upper loess has collapsibility inducing the compaction and air pressure among soil pores increases gradually. The cracks far from the test pit are generated by the violent motion of the cracks near the test pit. The wetting front of the self-weight collapse loess with heavy section takes the shape of an ellipse (the major axis is horizontal), and finally the eccentricity of elliptical humidification area becomes less. The soggy angle increases with the increasing supply of water source, and its variation range is 0皛55?. The vertical infiltration velocity presents the reduction tendency of power function.
- self-weight collapse loess with heavy section /
- soaking test /
- volumetric water content /
- matric suction /
- infiltration /
- soggy angle

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参考文献(20)

[1]	刘祖典 . 黄土力学与工程 [M]. 西安 : 陕西科技出版社 , 1996.LIU Zu-dian. Mechanics and engineering of loess[M]. Xi'an: Shanxi Sciences and Technology Press, 1996.in Chinese))
[2]	王永焱 , 林在贯 . 中国黄土的结构特征与物理力学性质 [M]. 北京 : 科学出版社 , 1990 .WANG Yong-yan, LIN Zai-guan. Structure characteristics and physical mechanics of Chinese loess[M]. Beijing: Science Press, 1990.in Chinese))
[3]	陈正汉 , 许镇鸿 , 刘祖典 . 关于黄土湿陷的若干问题 [J]. 土木工程学报 , 1986, 193): 62 – 69.CHEN Zheng-han, XU Zheng-hong, LIU Zu-dian. Some problems of collapsed loess[J]. Chinese Journal of civil Engineering, 1986, 193): 62 – 69.in Chinese) )
[4]	陈正汉 , 刘祖典 . 黄土的湿陷变形机理 [J]. 岩土工程学报 , 1986, 82): 1 – 12.CHEN Zheng-han, LIU Zu-dian. Mechanism of collapse deformation of loess[J]. Chinese Journal of Geotechnical Engineering, 1986, 82): 1 – 12.in Chinese) ).
[5]	杨运来 . 黄士湿陷机理的研究 [J]. 中国科学 , 1988(7): 756 – 765.YANG Yun-lai. Research on collapsibility mechanism of loess [J]. Scientia Sinica, 1988(7): 756 – 765.in Chinese))
[6]	高国瑞 . 黄土湿陷变形的结构理论 [J]. 岩土工程学报 , 1990, 124): 1 – 10.GAO Guo-rui. A structure theory for collapsing deformation of loess soils[J]. Chinese Journal of Geotechnical Engineering, 1990, 124): 1 – 10.in Chinese) )
[7]	苗天德 , 刘忠玉 , 任九生 . 湿陷性黄土的变形机理与本构关系 [J]. 岩土工程学报 , 1999, 214): 383 – 387 .MIAO Tian-de, LIU Zhong-yu, REN Jiu-sheng. Deformation mechanism and constitutive relation of collapsed loess[J]. Chinese Journal of Geotechnical Engineering, 1999, 214): 383-387.in Chinese) )
[8]	汪国烈 , 等 . 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 Guo-lie, et al. Test research on collapse loess under overburden pressure[R]. Lanzhou: Gansu Province Building Research Institute, 1975.in Chinese))
[9]	涂光祉 , 等 . 渭北张桥自重湿陷性黄土的试验研究 [R]. 西安 : 西安冶金建筑学院等 , 1975 .TU Guang-zhi, et al. Test research on collapse loess under overburden pressure in Weibei Zhangqiao[R]. Xi'an: Xi'an Metallurgy Building Institute, 1975.in Chinese) )
[10]	廖盛修 . 湿陷性黄土地基预浸水 [J]. 有色冶金建筑 , 1983(2): 1 – 13.LIAO Sheng-xiu. Study on presoaking of collapsible loess [J]. Nonferrous Metallurgy Construction, 1983(2): 1 – 13.in Chinese))
[11]	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, 146): 1 – 9.QIAN Hong-jing, ZHU Mei, XIE Shuang. Experimental study on the regularities of collapsible deformation of loess foundation in Hejin, Shanxi[J]. Chinese Journal of Geotechnical Engineering, 1992, 146): 1 – 9.in Chinese) )
[12]	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, 152): 1 – 11.LI Da-zhan, HE Yi-hua, SUI Guo-xiu. Study and test on immersion of Q₂ loess in large area[J]. Chinese Journal of Geotechnical Engineering, 1993, 152): 1 – 11.in Chinese))
[13]	罗宇生 , 等 . 宝鸡第二发电厂大面积试坑浸水试验报告 [R]. 西安 : 西北电力设计院 , 1994.LUO Yu-sheng, et al. Large area soaking test of the second power plant in Baoji[R]. Xi'an: Northwest Electric Power Design Institute, 1994.in Chinese))
[14]	黄雪峰 , 陈正汉 , 哈双 , 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, 283): 382 – 389.HUANG Xue-feng, CHEN Zheng-han, HA Shuang, et al. Large area field immersion test on characteristics of deformation of self weight collapse loess under overburden pressure[J]. Chinese Journal of Geotechnical Engineering, 2006, 283): 382 – 389.in Chinese))
[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, 2324): 4156 – 4160.LIU Bao-jian, XIE Yong-li, YU You-cheng. In-situ testing study on infiltration in unsaturated loess[J]. Chinese Journal of Rock Mechanics and Engineering, 2004, 2324): 4156 – 4160.in Chinese))
[16]	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, 324): 500 – 506. HUANG Xue-feng, LI Jia, CUI Hong, et al. Distribution characteristics of earth pressure for unsaturated intact loess[J]. Chinese Journal of Geotechnical Engineering, 2010, 324): 500 – 506.in Chinese))
[17]	GB50025 — 2004 湿陷性黄土地区建筑规范 [S]. 2004.GB50025 — 2004 Code for building construction in collapsible loess regions[S]. 2004.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 Guo-lie ， MING Wen-shan. Immersion deformation of collapse loess and engineering technologies[C]// Research and Engineering of Collapsed Loess. Beijing: China Architecture and Building Press, 2001: 21 – 32.in Chinese))
[19]	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, 66): 39 – 44.WANG Zhi-rong , WANG Wen-yan , WANG Quan-jiu . Experimental study on soil water movement from a point source [J] . Journal of Hydraulic Engineering , 2000, 66): 39 – 44.in Chinese))
[20]	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, 236): 1 – 4.ZHANG Zhen-hua, CAI Huan-jie, YANG Run-ya, et al. Characteristic pattern of drip irrigation infiltration under surface ponding[J]. Journal of Irrigation and Drainage, 2004, 236): 1 – 4.in Chinese))