| It serves to show maturity with foundation reinforcement technology,in this article,by adjusting the number of freezing and thawing of the soil plasticity index,soil,presence of geotextile bags of the early stage of the three major influencing factors,and the resonant column used under different confining pressure,different voltage late two under the force of impact factor,according to the circular measure the weight of soil freezing and thawing cycle and damping ratios to study the effect of the geotextile bags of soil frost heave of soil.Was developed according to the need of the indoor test,method of making the unidirectional freezing box,unidirectional freezing soil physical like under natural state from top to bottom one-way freeze,produced a diameter of 50 mm,100 mm steel drum in the frozen soil lateral restraint,convenient in the later earth do resonant column test soil,not easy to damage,no disturbance,and chooses the damping ratio of measuring equipment for the resonant column apparatus GDS companies RCA system,good stability,high precision,choose high precision electronic scale to measure the change of the soil specimen weight.Experiment chooses the plasticity index of Ip silty sand were 8.8,11.5 of silty clay,12.1 black soil and clay soil test target,18.0 midterm plasticity index Ip 8.8 silty sand as the main research object.Experimental results show that with the increase of resonant column function voltage,the lower the soil specimen resonance frequency,damping ratio is larger.Reached a peak stop growing.The damping ratio of soil and the size of the initial force has strong linear correlation,the greater the force,the damping ratio is larger.With the increase of number of freezing and thawing,soil water loss general situation,bagged soil water loss is bigger.With geotextile bag to protect the specimen,whether it is under the influence of the freeze-thaw cycle or in force increase,shows good stability,narrow the damping and the change of the resonance frequency range;Geotextile bags increased in the process of freezing and thawing of soil displacement,columnar geotechnical bag has a small,thick pore,in does not affect under the condition of drainage,hindered the process of water absorption,geotextile bags in the process of freezing and thawing cycle make water is attainable,prevention and control of the cycle of frost heave growth process,as the soil water loss as a result of the geotextile bags,make its no frost heave necessary materials,frost heave phenomenon will stop.Test results of geotextile bag reduce frost damage has guiding significance of engineering practice,also for later form system theory to lay the good foundation. |
