氯化钙溶液浸泡下压实水泥改性膨胀土的膨胀特性
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摘要
压实膨胀土可用于防止垃圾填埋场中的固体废弃物产生二次污染,这主要取决于压实膨胀土的抗渗特性。向膨胀土中掺加水泥进行改性后,不仅可以增强膨胀土的水稳定性,还能提高膨胀土的抗渗特性,且抗渗特性随着时间的增长而逐渐增强。因此,在制备衬砌方面,水泥改性膨胀土比膨胀土具有更大的优势。为研究水泥改性膨胀土衬砌在化学溶液下的膨胀特性,选取氯化钙溶液为渗透液体,以氯化钙溶液浓度和水泥掺量为控制变量,进行水泥改性膨胀土的自由膨胀率试验及压实膨胀试验。试验结果表明,向处在氯化钙溶液环境下的压实膨胀土中掺加一定量的水泥,可以有效地减小膨胀土的膨胀性、缩短膨胀达到稳定的时间以及增强膨胀土的稳定性。就减小膨胀土的膨胀性和增强膨胀土的稳定性来看,水泥的最佳掺量比应控制在15%左右。就缩短膨胀土达到稳定的时间来看,水泥的最佳掺量比应控制在10%左右。
Compacted expansive soil can be used as impermeable material of lining in the garbage landfill. When the cement is added into the expansive soil,the water stability of the expansive soil can be enhanced,the impermeability of the expansive soil can be improved,and the impermeability will gradually increase with time.Therefore,the cement modified expansive soil has a greater advantage than expansive soil as impermeable material of lining. In order to study the expansion characteristics of the compacted cement modified expansive soil under leaching with calcium chloride solution,the calcium chloride solution is selected as the permeating liquid,free swelling ratio test and compaction expansion test is carried out with the concentration of calcium chloride solution and the amount of cement as the control variables. The test results show that for the compacted cement modified expansive soil under leaching with calcium chloride solution,the expansibility of expansive soil can be decreased,the time of stable expansion can be reduced,and the stability of expansive soil can be enhanced by adding a certain amount of cement to the expansive soil. In terms of reducing the expansibility of expansive soil and enhancing the stability of expansive soil,the optimum mixing ratio of cement should be controlled at about 15%. In terms of shortening the stable time of expansive soil,the optimum mixing ratio of cement should be controlled at about 10%.
Compacted expansive soil can be used as impermeable material of lining in the garbage landfill. When the cement is added into the expansive soil,the water stability of the expansive soil can be enhanced,the impermeability of the expansive soil can be improved,and the impermeability will gradually increase with time.Therefore,the cement modified expansive soil has a greater advantage than expansive soil as impermeable material of lining. In order to study the expansion characteristics of the compacted cement modified expansive soil under leaching with calcium chloride solution,the calcium chloride solution is selected as the permeating liquid,free swelling ratio test and compaction expansion test is carried out with the concentration of calcium chloride solution and the amount of cement as the control variables. The test results show that for the compacted cement modified expansive soil under leaching with calcium chloride solution,the expansibility of expansive soil can be decreased,the time of stable expansion can be reduced,and the stability of expansive soil can be enhanced by adding a certain amount of cement to the expansive soil. In terms of reducing the expansibility of expansive soil and enhancing the stability of expansive soil,the optimum mixing ratio of cement should be controlled at about 15%. In terms of shortening the stable time of expansive soil,the optimum mixing ratio of cement should be controlled at about 10%.
引文
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[21]吴民武,徐涛,刘江磊.石灰、粉煤灰改性膨胀土的对比试验研究[J].中国水运,2008,8(12):181-182
[22] JTG E40—2007,公路土工试验规程[S]
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[2]汪学军.膨胀土的力学特性及改性方法研究[J].工程与建设,2014,(2):236-238
[3]崔颖,缪林昌.非饱和压实膨胀土渗透特性的试验研究[J].岩土力学,2011,32(7):2007-2012
[4]李雄威,张鹤年,张勇.膨胀土渗透性室内试验与非饱和渗透系数预测[J].四川建筑科学研究,2011,37(5):115-118
[5]李东森,夏熙临,陈丛丛,等.石灰、水泥及砂改性膨胀土工程特性的试验研究[J].南水北调与水利科技,2011,9(4):25-27
[6]李红炉,徐秋达.水泥改性膨胀土干密度与自由膨胀率试验研究[J].南水北调与水利科技,2009,7(6):216-219
[7]刘军,黄斌,龚壁卫,等.膨胀土水泥改性均匀性及长期效果试验研究[J].西北地震学报,2011,33(S1):204-208
[8]黄斌,聂琼,徐言勇,等.膨胀土水泥改性试验研究[J].长江科学院院报,2009,26(11):27-30
[9]阎飞.膨胀土改性试验研究[J].土工基础,2012,26(3):104-105
[10]赵春吉,赵红华,常艳,等.水泥改性强膨胀土理化试验研究[J].大连理工大学学报,2014,54(6):604-611
[11]战永亮,黄曾,刘思印.水泥改性安阳中膨胀土的试验研究[J].科学技术与工程,2013,13(25):7418-7421
[12]赵红华,郭靖,赵春吉,等.水泥改性邯郸强膨胀土微观结构变化的长期试验研究[J].三峡大学学报(自然科学版),2014,36(5):46-50
[13]谭松林,黄玲,李玉花.加石灰改性后膨胀土的工程性质研究[J].工程地质学报,2009,17(3):421-425
[14]庄心善,余晓彦.石灰-玄武岩纤维改性膨胀土强度特性的试验研究[J].土木工程学报,2015,(S1):166-170
[15]查甫生,刘松玉,杜延军.石灰-粉煤灰改良膨胀土试验[J].东南大学学报(自然科学版),2007,37(2):339-344
[16]惠会清,胡同康,王新东.石灰、粉煤灰改良膨胀土性质机理[J].长安大学学报(自然科学版),2006,26(2):34-37
[17]冯美果,陈善雄,余颂,等.粉煤灰改性膨胀土水稳定性试验研究[J].岩土力学,2007,28(9):1889-1893
[18]刘伟静,刘冰,杨元明,等.粉煤灰改性膨胀土的试验[J].中国农村水利水电,2011,(3):94-97
[19]周葆春,孔令伟,郭爱国.荆门弱膨胀土的胀缩与渗透特性试验研究[J].岩土力学,2011,(S2):424-429
[20]张京斌,江金亮,徐方媛,等.蒙脱石含量对膨胀土性质的实验研究[J].科技视界,2014,(18):7-8
[21]吴民武,徐涛,刘江磊.石灰、粉煤灰改性膨胀土的对比试验研究[J].中国水运,2008,8(12):181-182
[22] JTG E40—2007,公路土工试验规程[S]
[23]肖杰,王保田,孙衣春,等.水泥石灰复合改良膨胀土试验[J].南水北调与水利科技,2012,10(2):9-13