养护龄期和固化剂浓度对稀土矿山堆场土体固化效果的影响  

Influence of curing age and solidifying agent concentration on solidification effect of soil in rare earth mine storage yard

作　　者：陈飞[1,2] 叶东胜 张仕彬 朱合毅 陈雯敬 CHEN Fei;YE Dongsheng;ZHANG Shibin;ZHU Heyi;CHEN Wenjing(School of Resources and Environmental Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,China;Jiangxi Provincial Key Laboratory of Environmental Pollution Prevention and Control in Mining and Metallurgy,Ganzhou 341000,China)

机构地区：[1]江西理工大学资源与环境工程学院,赣州341000 [2]矿冶环境污染防控江西省重点实验室,赣州341000

出　　处：《江西冶金》2024年第5期367-374,共8页Jiangxi Metallurgy

基　　金：国家重点研发计划项目(2019YFC1805101)。

摘　　要：为了探究复合土壤固化剂浓度和养护龄期对废弃稀土矿山堆场土体固化效果的影响,通过21组直剪实验,定量分析固化剂浓度(αw=2%、3%、4%、5%、6%)和养护龄期(t=3、7、14、28 d)对重塑土样抗剪强度以及剪切应力的影响规律。结果表明,随着固化剂浓度增大和养护龄期延长,土体黏聚力和内摩擦角均明显增大。当竖向压力为100 kPa、固化剂浓度为2%、3%、4%、5%、6%时,土样对应的峰值剪切应力分别为97.69、122.46、139.46、186.49、220.97 kPa。当固化剂浓度为6%、养护龄期为3、7、14、28 d时,土体的剪切应力峰值分别为158.24、189.29、210.61、220.97 kPa。当固化剂浓度为2%时,土样在剪切过程中剪切应力随着剪切位移增加而增大;当固化剂浓度为6%时,土样的剪切应力随剪切位移增加呈先增大再减小最后保持稳定的趋势。In order to investigate the effects of the concentration and curing age of composite soil solidifying agents on the solidification effect of abandoned rare earth mine yard soil,21 sets of direct shear tests were conducted to quantitatively analyze the concentration of solidifying agents(αw=2%,3%,4%,5%and 6%),and curing age(t=3,7,14 and 28 d)on the shear strength index and shear stress of remolded soil samples.The experimental results show that soil cohesion and internal friction angle both significantly increase with the increase in curing agent concentration and curing age.Under a vertical pressure of 100 kPa,the peak shear stresses corresponding to soil samples with curing agent concentrations of 2%,3%,4%,5%and 6%are 97.69,122.46,139.46,186.49 and 220.97 kPa,respectively.αw=6%,the peak shear stress values of solidified soil with curing ages of 3,7,14 and 28 days are 158.24,189.29,210.61 and 220.97 kPa,respectively.When the concentration of the curing agent is 2%,the shear stress of the soil sample increases with the increase of shear displacement during the shear process.When the concentration of the curing agent increases to 6%,the shear stress of the soil sample shows a characteristic of first increasing,then decreasing,and finally maintaining stability with the increase of shear displacement.

关 键 词：复合土壤固化剂 浓度 养护龄期 直剪实验 剪切应力 

分 类 号：TU411.7[建筑科学—岩土工程] TD325[建筑科学—土工工程]