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为评价公路采空区泡沫轻质土新型注浆材料在水环境下工作性能的变化以及在西北部寒冷地区环境下的抗冻融性能,制备了气泡轻质土试样,分析了气泡轻质土试样在浸水和冻融循环条件下密度和无侧限抗压强度的变化幅度和规律。研究结果表明:试样的吸水过程主要发生在浸水初期的14d内,浸水30d至60d后,密度和吸水率维持为一稳定值;试样强度降低主要发生在浸水初期的7d内;试样水固比越大,其强度损失率越大。从试验结果看:试样浸水前后强度损失值并不大,能够适应水环境下的工作需要;试样在冻融第5次时强度损失率最大,在其后的冻融循环过程中,强度下降幅度降低,趋于平稳;气泡轻质土水灰比越大,抗冻融循环能力越弱;15次冻融循环后,水固比1∶1~1∶2的试样,其强度损失率为16.9%~10.7%;试样的密度和无侧限抗压强度随着泡沫溶液掺量的增加呈线性减小。研究提出了适用于公路富水采空区和冻融环境下采空区注浆处治新材料的配比范围。
In order to evaluate the change of working performance of the new grouting material in the mined area of highway goaf and its resistance to freeze-thaw under the environment of cold region in the northwestern part of China, the samples of bubble light soil were prepared, Variation and regularity of density and unconfined compressive strength of soils under immersion and freeze-thaw cycles. The results showed that the water absorption of the sample mainly occurred within 14 days in the initial immersion period, and the density and water absorption remained stable after 30 days to 60 days of immersion. The strength of the samples mainly occurred within 7 days in the initial immersion period. The greater the solid ratio, the greater the rate of strength loss. From the test results, the sample before and after immersion strength loss value is not large, to adapt to the needs of the work under water environment; sample in the fifth freeze-thaw the greatest loss of strength, in the subsequent freeze-thaw cycle, the strength The decreasing rate decreased and tended to be stable. The larger the water-cement ratio was, the weaker the resistance to freeze-thaw cycles. After 15 freeze-thaw cycles, the water-solid ratio of 1: 1 to 1: 2 The rate was 16.9% ~ 10.7%. The density and the unconfined compressive strength of the samples decreased linearly with the increase of foam solution dosage. The research proposes a range of proportioning ratio of new material applied to the grouting treatment of goaf in water-rich areas and frozen-thawed environments.