Experimental Research On Frost Resistance Of Soil In Bags

With the development of the technology of ground treatment, the technology of soil foundation treatment has been greatly developed. The use of the good reinforcement of the soil and the foundation and the earthquake resistance of the foundation and the engineering examples have been obtained. But investigate its new areas of research, this paper proposes the geotextile bag in the alpine region especially in seasonal frozen soil area to prevent frost heaving of the processing technology. Before engineering practice, a series of laboratory tests are needed. So this paper adjusts the freezing temperature, soil type, soil moisture content of soilbag on soil frost heave effect.According to the needs of indoor test development of frost heaving thaw device, while using a constant temperature freezer, micro displacement meter, data recorder together and test equipment performance is good. Set in the experiment. Three kinds of soil(fine sand, silty clay,clay,- 5 ?,- 10 ?,- 15 ? three temperature, 18.5%, 23.5%, 28.5% three moisture,combined by three factors affecting frost heave, obtained 27 combinations, the test also bare soil of the comparison test, finally unearthed bags under the open system, what form can play the most good working performance.Experimental results show that under the condition of same temperature and the equivalent water content, frost heave of fine sand rate times the smallest, clay and silty clay is the largest,and geotextile bags of frost heave of silty clay is most obvious inhibition; Under the condition of the same soil, the same moisture content, soil freezing rate to decrease with the temperature increasing, soil frost heave rate has a tendency to decrease, and geotextile bags right- 5 ? soil frost heave effect is most obvious; In the same soil, under the condition of same temperature,frost heave rate increased with the increase of water content increasing, the geotextile bags of high water content of the bondage of the soil has obvious effect, but there is a special phenomenon, silty clay in temperature-5 ?, the amount of moisture content of 28.5% cases,compared with bare soil geotextile bags of silty clay bound strength is not particularly strong,analysis the reason, is because of silty clay in high water content, relatively high temperature under the condition of frost heaving ratio is too large, so the degree of geotextile bags in the bondage of the soil also reduced. To sum up, geotextile bags at-5 ? temperature moisture content 23.5% of silty clay bound function is the strongest.The test results of geotextile bags guiding significance to reduce the rate of frost heave engineering practice, also for later form system theory to lay the good foundation.