基于水性聚氨酯与膨润土的混合固土效果试验研究  

Experimental study on soil consolidation effect based on waterborne polyurethane and bentonite

作　　者：陈飞[1,2] 罗特 施康 钱乾 CHEN Fei;LUO Te;SHI Kang;QIAN Qian(School of Resources and Environmental Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,Jiangxi,China;Jiangxi Key Laboratory of Mining Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,Jiangxi,China)

机构地区：[1]江西理工大学资源与环境工程学院,江西赣州341000 [2]江西理工大学、江西省矿业工程重点实验室,江西赣州341000

出　　处：《有色金属科学与工程》2023年第2期272-279,共8页Nonferrous Metals Science and Engineering

基　　金：国家重点研发专项资助项目(2019YFC1805101);国家自然科学基金地区资助项目(42067042);赣州市科技成果转移转化资助项目(2020H11)。

摘　　要：水性聚氨酯和膨润土是2种性质不同的固化剂,分别单独固化赣南离子型稀土矿山浸矿场地边坡土壤,均能有效提高土壤抗剪强度,但此2种固化剂使抗剪强度提高的影响因素不同。为提高固化剂固土的利用效果,将水性聚氨酯与膨润土按不同比例混合,重塑含水率为17.09%的浸矿场地边坡土样,土样在相同室内环境下养护3 d后进行快剪试验。结果表明:当控制膨润土比重不变,增加水性聚氨酯比重,黏聚力显著提高,内摩擦角变化较小;当控制水性聚氨酯比重不变,增加膨润土比重,黏聚力变化较小,内摩擦角先增后减。对比19种不同配比实验结果,当m(碳酸氢钠)∶m(水性聚氨酯)∶m(膨润土)∶m(水)=1∶15∶12∶100时,内摩擦角与黏聚力均达到最大值,该混合比例的固土效果最优。Waterborne polyurethane and bentonite are two kinds of curing agents with different properties.Separately curing the slope soil of the leaching site of ionic rare earth mine in southern Jiangxi can effectively improve the shear strength of the soil,but the influencing factors of these two curing agents are different.In order to improve the utilization effect of solidified soil,waterborne polyurethane and bentonite were mixed in different proportions to reshape the slope soil sample of leaching site with moisture content of 17.09%.The quick shear test was carried out to the soil sample after curing for 3 days in the same indoor environment.The test results showed that the cohesion was significantly improved and the internal friction angle changed little when the specific gravity of bentonite was kept constant and the specific gravity of waterborne polyurethane was increased.When controlling the constant specific gravity of waterborne polyurethane and increasing the specific gravity of bentonite,the cohesion changed little,and the internal friction angle increased first and then decreased.When the mass ralio of sodium bicarbonate,waterborne polyurethane,bentonite and water is 1∶15∶12∶100,the internal friction angle and cohesion reached the maximum,and the soil consolidation effect on this mixed ratio was the best by comparing the experimental results of 19 different ratios.

关 键 词：水性聚氨酯 膨润土 快剪试验 抗剪强度 

分 类 号：TU411.7[建筑科学—岩土工程] TD3[建筑科学—土工工程]