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CONTROL METHOD ANALYSIS ON FROST HEAVE WITH GEOTEXTILES AS THE EFFECT OF CAPILLARY BREAKS IN SOILS

土工织物毛细管破裂效应对冻胀的控制方法分析

基本信息

批准号：
04806033
负责人：
TSUCHIYA Fujio
金额：
$ 1.15万
依托单位：
OBIHIRO UNIVERSITY OF AGRICULTURE AND VETERINAY MEDICINE
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1993
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04806033/
关键词：
GEOTEXTILE SOIL FREEZING FROST HEAVE CAPILLARY RISE FILTER LAYER

项目摘要

In order to develop the method of capillary breaks for the practical use, the laboratory experiments to prove the mechanism were conducted using several geotextiles, and field investigation was also carried out during three winters. The capillary rise experiment was first conduced to evaluate the potential of the several geotextiles. Then each geotextile was emplaced at mid-height in the soil column and water level was maintained at the same position. If a volcanic ash soil with high retention and high frost susceptivity was used, the potential of geotextiles was recognized for the effect of capillary breaks. In laboratory frost heave tests, the specimen was kept on the bottom at 4 C and was frozen from the too at -6 C.Consequently two kinds of thick geotextiles interpreted the uptake of water and indicated the effect of frost heave reduction by amounts below 50 percent. They were polyester geotextiles with three-layred structure and resin-bonding mat-shaped fabric, ranging from 7.5 mm to 10 mm in thickness. Some thin geotextiles did not show the effect of the reduction on frost heave. The field experiment was performed with several lysimeters under the constant water level conditions that was maintained at the 120 cm deep from the surface during three winters. The geotextiles were installed between the maximum frost penetration depth and the groundwater level. thick geotextiles, the same kinds used in the laboratory tests showed to be durable to reduce frost heave through three winters. In conclusion, it appears likely that the method of capillary breaks with geotextiles is significant for the remedies of frost heave control and the polyester geotextiles with thick structure were most effective to mitigate frost heave in soils.

为了使毛管破裂法在实际工程中得到应用，采用几种土工织物进行了室内试验，并进行了三个冬季的现场调查。首先进行了毛细上升实验，以评估几种土工织物的潜力。然后将每个土工织物放置在土柱中的中间高度，并将水位保持在相同的位置。如果使用具有高保持力和高抗冻性的火山灰土壤，则认识到土工织物的毛细管断裂效应的潜力。在实验室的冻胀试验中，试样保持在4 C的底部，并在-6 C的温度下从底部冻结。因此，两种厚土工织物解释了吸水性，并表明了50%以下的量的冻胀减少效果。这些土工布为聚酯土工布，具有三层结构和树脂粘合垫状织物，厚度由7.5毫米至10毫米不等。一些薄土工织物没有表现出减少对冻胀的影响。田间试验采用多台蒸渗仪，在距地表120 cm的恒定水位条件下进行，历时3个冬季。土工布安装在最大霜冻深度和地下水位之间。实验室测试中使用的厚土工织物表明，在三个冬天里，这种土工织物都能持久地减少冻胀。因此，土工织物的毛细破裂法对防治土体的冻胀具有重要意义，厚结构聚酯土工织物对抑制土体的冻胀最为有效。