分散性土改性效果干湿循环模型试验研究
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摘要
现行水利工程上主要采用掺入改性剂消除分散性土的分散性,但在部分工程应用中效果并不理想。为了消除分散性土的分散性,提高分散性土的性能,以更好地应用于工程实际中,从改性剂对分散性土改性效果方面进行研究。选取掺入量为4%粉煤灰、1%生石灰及1%水泥的组合改性剂,采用干湿循环模型试验研究组合改性剂对分散性土的改性效果,并通过25次干湿循环试验分析改性后分散性土的工程耐久性能。试验揭示了干湿循环下分散性土及其改性土坡面降雨冲刷破坏形态及干燥裂化特征。研究结果表明:改性后的分散性土在干湿循环下性能优于分散性土,改性土相对流失减少率主要集中在40%～60%之间,最大可达到74.92%。组合改性剂能够消除分散性土的分散性,提高其抗冲刷能力,且具有良好的工程耐久性。研究方法和研究结果可为分散性土改性工作提供参考。
Currently, hydraulic engineering mainly adopts the method of modifier to treat dispersive soil, but the effect is not satisfactory in the practical application of some projects. In order to eliminate the dispersibility of dispersive soil and improve the performance of dispersive soil, we make the study on the effect of modifier on the modification of dispersive soil to better apply dispersive soil to engineering practice. A combination modifier containing 4% fly ash, 1% quicklime and 1% cement is selected based on laboratory tests. The dry-wet cycle model test is used to study the modification effect of combined modifiers on dispersive soils. The engineering durability of the modified dispersible soil is analyzed by 25 dry-wet cycle tests. The experiment reveals the characteristics of rainfall erosion and dry cracking of the dispersive soil and its modified soil on the slope of dry and wet circulation. The results show that the modified dispersive soil is better than the dispersive soil under the dry-wet cycle. The relative loss reduction rate of the modified soil is mainly in the range of 40%～60% and the maximum can reach 74.92%. The combination modifier can eliminate the dispersibility of the dispersible soil, improve its anti-scour ability, and has good engineering durability. Research methods and results can provide reference for the work of dispersive soil modification.
Currently, hydraulic engineering mainly adopts the method of modifier to treat dispersive soil, but the effect is not satisfactory in the practical application of some projects. In order to eliminate the dispersibility of dispersive soil and improve the performance of dispersive soil, we make the study on the effect of modifier on the modification of dispersive soil to better apply dispersive soil to engineering practice. A combination modifier containing 4% fly ash, 1% quicklime and 1% cement is selected based on laboratory tests. The dry-wet cycle model test is used to study the modification effect of combined modifiers on dispersive soils. The engineering durability of the modified dispersible soil is analyzed by 25 dry-wet cycle tests. The experiment reveals the characteristics of rainfall erosion and dry cracking of the dispersive soil and its modified soil on the slope of dry and wet circulation. The results show that the modified dispersive soil is better than the dispersive soil under the dry-wet cycle. The relative loss reduction rate of the modified soil is mainly in the range of 40%～60% and the maximum can reach 74.92%. The combination modifier can eliminate the dispersibility of the dispersible soil, improve its anti-scour ability, and has good engineering durability. Research methods and results can provide reference for the work of dispersive soil modification.
引文
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[9] MURAT T,PINAR V. The effects of cement and natural zeolite additives on problematic clay soils[J]. Science and Engineering of Composite Materials,2013,20(4):395- 405.
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[2] 洪有纬,盛守田.黑龙江省西部地区分散性粘土工程特性及处理措施[J].岩土工程学报,1984(6):42- 52.
[3] 任佳宽. 吉林省镇赉地区分散性土冲蚀机理研究[D].长春:吉林大学,2017.
[4] JAFAR B B,HAMIDREZA S B. Proceedings of the 17th International Conference on Soil Mechanics and Geotechnical Engineering[C]. Alexandria: IOS Press,2009.
[5] NILO C C,RUBéN A Q S,NéSTOR M K V. Durability,strength and stiffness of dispersive clay-lime blends[J]. Journal of Materials in Civil Engineering,2016, 28(11):04016124.
[6] 樊恒辉,孔令伟,李洪良,等. 马家树水库大坝防渗土料分散性判别和改性试验[J].岩土力学,2010,31(1):193- 198,222.
[7] VAKILI A H,SELAMAT M R B,AZIZ H B A. Treatment of dispersive clay soil by ZELIAC[J]. Geoderma, 2017, 285:270- 279.
[8] 严应佳,樊恒辉,杨秀娟. 粉煤灰改性分散性土的工程特性试验研究[J].水力发电学报,2017,36(4):86- 94.
[9] MURAT T,PINAR V. The effects of cement and natural zeolite additives on problematic clay soils[J]. Science and Engineering of Composite Materials,2013,20(4):395- 405.
[10] 徐向舟,张红武,董占地,等. SX200管网式降雨模拟装置的试验研究[J].中国水土保持,2006(4):8- 10.
[11] 陈金波,王立坤. 小波随机耦合模型在胖头泡蓄滞洪区年降水量预测中的应用[J].水利科技与经济,2012,18(2):38- 40.