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为了解不同环境参数对经一定次数冻融循环后GCL材料中膨润土膨胀性的影响,通过室内试验研究了不同温度、盐浓度、pH值条件下,经10,20和40次冻融循环后GCL材料中膨润土膨胀指数的变化规律及颗粒粒径分布.结果表明,在相同冻融循环次数下,膨胀指数随温度的升高而增大,最大增幅为30.77%;随盐浓度和溶液酸碱度的增大而减小,最大减幅分别为65.22%和15.38%.在相同盐浓度或pH值条件下,膨胀指数与冻融循环次数无明显关系,而在相同水浴温度下,膨胀指数与冻融循环次数呈明显正相关.激光粒度仪试验结果表明,环境参数会对GCL材料中膨润土的颗粒粒径分布产生显著影响,继而影响试样的膨胀指数.
In order to understand the influence of different environmental parameters on the swelling behavior of bentonite in GCL after a certain number of freeze-thaw cycles, the effects of different temperature, salt concentration and pH on the swelling behavior of bentonite were investigated by laboratory experiments. After 10, 20 and 40 freeze-thaw cycles The results showed that the swelling index increased with the increase of temperature at the same number of freeze-thaw cycles, with the maximum increase being 30.77%. With the increase of salt concentration and solution pH The maximum decrease is 65.22% and the maximum decrease is 15.38% .In the same salt concentration or pH value, the swelling index has no obvious relationship with the number of freeze-thaw cycles, but at the same water bath temperature, the swelling index and the freeze-thaw cycle The results of laser particle size analyzer showed that the environmental parameters would have a significant effect on the particle size distribution of bentonite in GCL materials and then affect the swelling index of the samples.