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PS非饱和入渗的现场试验
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作者邵明申;裴强强;王思敬;李最雄;王恩志
机构清华大学水沙科学与水利水电工程国家重点实验室;敦煌研究院;中国科学院地质与地球物理研究所
中文关键词PS入渗;非饱和土;湿润锋;基质势;重力势
中文摘要针对土遗址中的表面风化层,在交河故城现场夯筑模拟试验墙,研究PS溶液在滴渗条件下的入渗规律。结果表明,非饱和条件下PS入渗主要受基质势和重力势的控制,在入渗初期,基质势起主导作用,水平方向和竖直方向的湿润锋推进速率较大,后期重力势发挥更大作用,速率逐渐减小,并最终达到稳定的入渗状态;对PS入渗过程中湿润锋的推进距离与时间做了函数关系拟合,其中乘幂函数关系式拟合最好;墙体干密度对入渗有较大影响,密度越大湿润锋运移距离和入渗速率越低,入渗量越小;对于密度普遍较小的风化层而言,PS完全可以提供足够的渗透量和入渗速率,满足加固要求。
英文篇名Field tests of PS infiltration for unsaturated earthen sites
英文作者SHAO Mingshen1 PEI Qiangqiang2 WANG Sijing1,3 LI Zuixiong2 WANG Enzhi1(1.State Key Laboratory of Hydroscience and Engineering,Tsinghua University,Beijing 100084,China; 2.Conservation Institute of Dunhuang Academy,Dunhuang,Gansu 736200,China; 3.Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China)
英文摘要The regularity of PS infiltration under unsaturated condition was studied by using the artificial wall built on the platform of the ruins of Jiaohe city instead of the weathering crust in earthen sites.The results indicated that PS infiltration for unsaturated earthen sites was determined dominatingly by matrix potential and gravitational potential,relatively matrix potential was more important in the beginning of infiltration,gravitational potential in anaphase,which resulted in that the wetting front movement possesses were gradually fasted in the beginning and became slower in anaphase under the drip infiltration.And the relation about wetting front distance and time was simulated and it conformed to power function laws.In addition,the infiltration capacity decreased with soil compactness increasing.The study proved PS infiltration totally can meet a demand for conserving the earthen sites.
英文关键词PS infiltration;unsaturated soil;wetting front;matrix potential;gravitational potential
中文刊名敦煌研究
拼音刊名DHYJ
英文刊名Dunhuang Research
2012
03
CN62-1007/K
ISSN1000-4106
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