电势梯度对软土电渗固结效果及能耗的影响分析  

Impact of Potential Gradient on Soft Soil Electro-osmoticConsolidation Effect and Energy Consumption

作　　者：黄文聪 李广 罗沈 韦未[1] 南春子 张伟锋[1] HUANG Wen-cong;LI Guang;LUO Shen;WEI Wei;NAN Chun-zi;ZHANG Wei-feng(College of Water Conservancy and Civil Engineering,South China Agricultural University,Guangzhou 510642,China;Zhongshan Power Supply Bureau,Guangdong Power Grid Corporation,Zhongshan 528400,China)

机构地区：[1]华南农业大学水利与土木工程学院,广州510642 [2]广东电网有限责任公司中山供电局,广东中山528400

出　　处：《长江科学院院报》2025年第4期134-141,共8页Journal of Changjiang River Scientific Research Institute

基　　金：南方电网公司科技项目(GDKJXM20230271,GDKJXM20230273);华南农业大学大学生创新训练项目(2023105641125,2023105641178)。

摘　　要：为优化电渗方法,研究不同电势梯度下软土固结效果并综合分析能量消耗,设置V1—V6共6组电势梯度(1.00、1.25、1.50、1.75、2.00、2.25 V/cm),通过对比电渗中的排水比、接触电阻与平均能耗系数,以及电渗后的含水率、承载力、抗剪强度,综合分析电渗加固软土的最佳电势梯度。结果表明:除V1和V2外,其余4组电渗后土体的排水比和最终含水率均差别不大;但是在通电后期,V1、V3、V6的接触电阻分别增长15.76、25.65、35.39倍,平均能耗系数分别增长5.07、6.12、10.98倍;各组土体强度均随电势梯度的增加而提高,其中V1—V6的土体平均承载力特征值提高了2.79~4.89倍,平均抗剪强度在5.7~12.2 kPa区间,主要原因是高电势梯度下土体能够快速固结。因此,若不考虑能耗,最佳电势梯度为2.00~2.25 V/cm;若考虑节约能源,最佳电势梯度为1.50~2.00 V/cm。To optimize the electroosmotic method,we investigated the consolidation effect of soft soil under various potential gradients and conducted a comprehensive analysis of energy consumption.Six groups of potential gradients(1.00,1.25,1.50,1.75,2.00,2.25 V/cm),denoted as V1 to V6,were set up.We comprehensively analyzed the optimal potential gradient for electroosmotic reinforcement of soft soil by comparing the drainage ratio,contact resistance,and average energy-consumption coefficient during electroosmosis,along with the water content,bearing capacity,and shear strength after electroosmosis.The results indicate that,except for V1 and V2,there were negligible differences in the drainage ratio and final water content of the soil after electroosmosis.However,in the later stage of power-on,the contact resistances of V1,V3,and V6 increased by 15.76,25.65,and 35.39 times respectively,and the average energy-consumption coefficients increased by 5.07,6.12,and 10.98 times respectively.The soil strength of all groups increased with the rise of the potential gradient.Specifically,the average bearing capacity of the V1-V6 soils increased by 2.79-4.89 times,and the average shear strength increased by 5.7-12.2 kPa.This is mainly because the soil can consolidate rapidly under a high potential gradient.Therefore,without considering energy consumption,the optimal potential gradient ranges from 2.00 to 2.25 V/cm.However,when energy-saving is taken into account,the optimal potential gradient lies between 1.50 and 2.00 V/cm.

关 键 词：软土 电渗固结 电势梯度 排水比 能耗系数 土体强度 

分 类 号：TU411[建筑科学—岩土工程]