利用自制冻胀试验装置，对淤泥质黏土、淤泥质粉质黏土、粉砂在不同冷端温度、含水率及 荷载作用下的冻胀规律进行试验研究。结果表明：在试验含水率及干密度范围内，土体冻胀率随冷 端温度下降线性降低，随土样含水率增加线性增大，随干密度增加而增大，随上部荷载增大呈指数 规律降低。同时对淤泥质黏土进行了正交冻胀试验，表明各因素对土体冻胀率的影响程度的由大到 小顺序为：含水率、冷端温度、干密度、上部荷载。最后给出了不同因素对黏性土冻胀的预测模型 。
Abstract
The shallow top soil in Nanjing is selected as the sample to investigate, and the frost heave deformation is measured by independently developed equipment to study the frost heave disciplinarian of soils in different cold junction temperature, moisture content and load effect. The results showed that the soils’ frozenheave factor reduces linearly with cold junction temperature decreasing, enhances linearly with moisture content increasing, exponential declining with load effect increasing. On the other hand, carrying on four factors three levels orthogonal experiments to the muddy clay, analyzing various factors from the test result to the soil frost heave disciplinarian influence primary and secondary order, namely, moisture content> cold junction temperature> load effect. Lastly，compositive forecasting model can be found which reflecting the relationship between influence factor and soil’s frost heave disciplinarian. The mathematical model is an evidence to freezing method’s designing and construction in Nanjing.
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
参考文献
[1]杨平,佘才高,董朝文,等. 人工冻结法在南京地铁张府园车站的应用[J]. 岩土力学,2003,24(增 2):388-391.
[2]齐吉琳,马巍. 冻融作用对超固结土强度的影响[J]. 岩土工程学报,2006,28(12):2082-2086.
[3]杨成松,何平,程国栋,等. 冻融作用对土体干容重和含水量影响的试验研究[J]. 岩石力学与工程 学报,2003,22(增2):2695-2699.
[4]Radd F J, Oertle D H. Experimental pressure studies of frost heave mechanisms and the growth fusion hehavior[C]//2nd Int. Conf on Permafrost. Washington: National Academy Press, 1973.
[5]Miller R D. Freezing and heaving of saturated and un saturated soils[J]. Highway Research Board, 1972, 393: 1-11.
[6]柯洁铭,杨平.冻土冻胀融沉的研究进展[J].南京林业大学学报:自然科学版,2004,28(4):105- 108.
[7]柯洁铭,杨平. 有限单元法在人工冻土冻胀数学模型分析中的应用[J]. 公路工程,2009,34 (1):25-29.
[8]杨平,张婷. 人工冻融土物理力学性能研究[J]. 冰川冻土,2002,24(5):665-667.
[9]Ping Yang, Jieming Ke, Wang J G, et al. Numerical simulation of frost heave with coupled water freezing, temperature and stress fields in tunnel excavation[J]. Computer and Geotechnics, 2006, 33: 6-7.
[10]陈湘生,濮家骝,殷昆亭,等. 地基冻融循环离心模型试验研究[J]. 清华大学学报,2002,42 (4):531-534.
[11]王效宾,杨平,王海波,等. 冻融作用对黏土力学性能影响的试验研究[J]. 岩土工程学 报,2009,31(11):1768-1772.
[12]王效宾,杨平,张婷. 人工冻土融沉特性试验研究[J]. 南京林业大学学报:自然科学版,2008,32 (4):108-112.
[13]王效宾,杨平. 基于BP人工神经网络的冻土融沉系数预测方法研究[J]. 森林工程,2008,24 (5):18-21.
[14]中国标准化技术委员会. GB/T 50123—1999土工试验方法标准[S]. 北京:中国标准出版 社,1999.
[15]徐学祖,邓友生. 冻土中水分迁移的实验研究[Ｍ]. 北京:科学出版社,1991. (责任编辑李燕文)第34卷第4期2010年7月南京林业大学学报(自然科学版)Journal of Nanjing Forestry University (Natural Science Edition)Vol.34, No.4Jul., 2010
基金
收稿日期：2009-12-05修回日期：2010-04-07基金项目：江苏省政府资助“ 六大人才高峰”项目(2004);苏州市科技局苏州轨道交通专项(ZXJ0802)作者简介：张婷(1976—),讲 师,博士生。*杨平(通信作者)，教授。Email: yangping@njfu.com.cn。引文格式：张婷,杨平,王 效宾. 浅表土人工冻土冻胀特性的研究[J]. 南京林业大学学报:自然科学版,2010,34(4):65-68.
PDF(701677 KB)
