化学电渗法加固软基位移场观测透明土模型试验
|
摘要
化学电渗法是通过电极添加化学溶液以提高电渗效率、增强加固效果的新技术。基于新型透明黏土材料和PIV技术,开展化学电渗法加固软基透明土模型试验,可视化观测土体内部位移场、排水量等变化规律;着重分析了电压梯度、电渗时长、以及化学溶液浓度等因素对软基加固效果的影响规律。研究结果表明:本文试验条件下,电压梯度每增大0.2V/cm,电流峰值平均增大35%,排水速率峰值平均增大30%;加入化学溶液能降低40%的有效电阻,试剂浓度每增大0.5 mol/L,排水速率峰值平均增幅为25%。
Chemical electro-osmosis is one of new technologies to increase the electro-osmotic efficiency and enhance the reinforcing effects by adding chemical solution through the electrode. Based on one new transparent clay material and PIV technology, model tests on the soft ground reinforcement by chemical electro-osmosis method are carried out. The internal displacement field and drainage are measured, and the reinforcement effects influenced by voltage gradient, electro-osmotic duration, chemical solution concentration, and other factors are discussed and analyzed. Under this model test condition, the results show that the current peak value increases by about 35%, and the drainage rate increases by about 30% under every 0.2 V/cm increase of the voltage gradient. The addition of chemical reagent can reduce the effective resistance by 40%. Every 0.5 mol/L increase in the concentration of the reagent, the average increase in the peak rate of the drainage rate is 25%.
Chemical electro-osmosis is one of new technologies to increase the electro-osmotic efficiency and enhance the reinforcing effects by adding chemical solution through the electrode. Based on one new transparent clay material and PIV technology, model tests on the soft ground reinforcement by chemical electro-osmosis method are carried out. The internal displacement field and drainage are measured, and the reinforcement effects influenced by voltage gradient, electro-osmotic duration, chemical solution concentration, and other factors are discussed and analyzed. Under this model test condition, the results show that the current peak value increases by about 35%, and the drainage rate increases by about 30% under every 0.2 V/cm increase of the voltage gradient. The addition of chemical reagent can reduce the effective resistance by 40%. Every 0.5 mol/L increase in the concentration of the reagent, the average increase in the peak rate of the drainage rate is 25%.
引文
[1]李一雯,周建,龚晓南,等.电极布置形式对电渗效果影响的试验研究[J].岩土力学,2013,34(7):1972-1978.(LIYi-wen,ZHOU Jian,GONG Xiao-nan,et al.Experimental research on influence of electrode array on electroosmotic effect[J].Rock and Soil Mechanics,2013,34(7):1972-1978.(in Chinese))
[2]陶燕丽,周建,龚晓南,等.基于杭州软土的电渗迁移过程试验研究[J].中南大学学报(自然科学版),2018,49(2):448-453.(TAO Yan-li,ZHOU Jian,GONG Xiao-nan,et al.Experimental study on transport process of electro-osmosis based on Hangzhou soft soil[J].Journal of Central South University(Science and Technology),2018,49(2):448-453.(in Chinese))
[3]周昌,胡新丽,徐楚,等.基于电磁驱动的滑坡模型水分迁移理论及试验研究[J].岩土力学,2018,39(9):1001-1008.(ZHOU Chang,HU Xin-li,XU Chu,et al.Theory and experimental study of moisture migration of landslide model test based on electromagnetic drive[J].Rock and Soil Mechanics,2018,39(9):1001-1008.(in Chinese))
[4]OU C Y,CHIEN S C,LEE T Y.Development of a suitable operation procedure for electroosmotic chemical soil improvement[J].Journal of Geotechnical and Geoenvironmental Engineering,ASCE,2012,139(6):993-1000.
[5]CHIEN S C,TENG F C,OU C Y.Soil improvement of electroosmosis with the chemical treatment using the suitable operation process[J].Acta Geotechnica,2015,10(6):813-820.
[6]任连伟,肖扬,孔纲强,等.化学电渗法加固软黏土地基对比室内试验研究[J].岩土工程学报,2018,40(7):1247-1256.(REN Lian-wei,XIAO Yang,KONG Gang-qiang,et al.Laboratory tests on soft ground improvement by chemical electro-osmosis method[J].Chinese Journal of Geotechnical Engineering,2018,40(7):1247-1256.(in Chinese))
[7]KONG G Q,CAO Z H,ZHOU H,et al.Analysis of pile under oblique pullout load using transparent soil models[J].Geotechnical Testing Journal,ASTM,2015,38(5):725-738.
[8]孔纲强,刘璐,刘汉龙,等.透明砂土变形特性三轴试验研究[J].岩土工程学报,2013,35(6):1140-1146.(KONGGang-qiang,LIU Lu,LIU Han-long,et al.Triaxial tests on deformation characteristics of transparent glass sand[J].Chinese Journal of Geotechnical Engineering,2013,35(6):1140-1146.(in Chinese))
[9]孔纲强,周杨,刘汉龙,等.新型透明黏土制配及其物理力学特性研究[J].岩土工程学报,2018,40(12):2208-2214.(KONG Gang-qiang,ZHOU Yang,LIU Han-long,et al.Study on new transparent clay manufacture and its physical and mechanical properties[J].Chinese Journal of Geotechnical Engineering,2018,40(12):2208-2214.(in Chinese))
[10]孔纲强,孙学瑾,刘汉龙,等.孔隙液体对透明土渗透特性影响对比试验[J].水利学报,2017,48(11):1303-1310.(KONG Gang-qiang,SUN Xue-jin,LIU Han-long,et al.Contrast experiments on permeability of transparent soil influenced by pore fluids[J].Journal of Hydraulic Engineering,2017,48(11):1303-1310.(in Chinese))
[2]陶燕丽,周建,龚晓南,等.基于杭州软土的电渗迁移过程试验研究[J].中南大学学报(自然科学版),2018,49(2):448-453.(TAO Yan-li,ZHOU Jian,GONG Xiao-nan,et al.Experimental study on transport process of electro-osmosis based on Hangzhou soft soil[J].Journal of Central South University(Science and Technology),2018,49(2):448-453.(in Chinese))
[3]周昌,胡新丽,徐楚,等.基于电磁驱动的滑坡模型水分迁移理论及试验研究[J].岩土力学,2018,39(9):1001-1008.(ZHOU Chang,HU Xin-li,XU Chu,et al.Theory and experimental study of moisture migration of landslide model test based on electromagnetic drive[J].Rock and Soil Mechanics,2018,39(9):1001-1008.(in Chinese))
[4]OU C Y,CHIEN S C,LEE T Y.Development of a suitable operation procedure for electroosmotic chemical soil improvement[J].Journal of Geotechnical and Geoenvironmental Engineering,ASCE,2012,139(6):993-1000.
[5]CHIEN S C,TENG F C,OU C Y.Soil improvement of electroosmosis with the chemical treatment using the suitable operation process[J].Acta Geotechnica,2015,10(6):813-820.
[6]任连伟,肖扬,孔纲强,等.化学电渗法加固软黏土地基对比室内试验研究[J].岩土工程学报,2018,40(7):1247-1256.(REN Lian-wei,XIAO Yang,KONG Gang-qiang,et al.Laboratory tests on soft ground improvement by chemical electro-osmosis method[J].Chinese Journal of Geotechnical Engineering,2018,40(7):1247-1256.(in Chinese))
[7]KONG G Q,CAO Z H,ZHOU H,et al.Analysis of pile under oblique pullout load using transparent soil models[J].Geotechnical Testing Journal,ASTM,2015,38(5):725-738.
[8]孔纲强,刘璐,刘汉龙,等.透明砂土变形特性三轴试验研究[J].岩土工程学报,2013,35(6):1140-1146.(KONGGang-qiang,LIU Lu,LIU Han-long,et al.Triaxial tests on deformation characteristics of transparent glass sand[J].Chinese Journal of Geotechnical Engineering,2013,35(6):1140-1146.(in Chinese))
[9]孔纲强,周杨,刘汉龙,等.新型透明黏土制配及其物理力学特性研究[J].岩土工程学报,2018,40(12):2208-2214.(KONG Gang-qiang,ZHOU Yang,LIU Han-long,et al.Study on new transparent clay manufacture and its physical and mechanical properties[J].Chinese Journal of Geotechnical Engineering,2018,40(12):2208-2214.(in Chinese))
[10]孔纲强,孙学瑾,刘汉龙,等.孔隙液体对透明土渗透特性影响对比试验[J].水利学报,2017,48(11):1303-1310.(KONG Gang-qiang,SUN Xue-jin,LIU Han-long,et al.Contrast experiments on permeability of transparent soil influenced by pore fluids[J].Journal of Hydraulic Engineering,2017,48(11):1303-1310.(in Chinese))