盾构渣土中阴离子表面活性剂吸附规律试验研究  

Experimental Study on the Adsorption Law of Anionic Surfactants in Shield Soil

作　　者：曹亚洲 吴志雄 李娅楠 胡黎明[1] 王睿[1] 张玄 肖颖 CAO Yazhou;WU Zhixiong;LI Yannan;HU Liming;WANG Rui;ZHANG Xuan;XIAO Ying(State Key Laboratory of Hydro-Science and Engineeing,Department of Hydraulie Engineeing,Tsinghua University,Beijing 100084;CCCC-SHEC Third Highway Engineering Co.,Ltd,Xi'an 710016)

机构地区：[1]清华大学水利水电工程系水沙科学与水利水电工程国家重点实验室,北京100084 [2]中交二公局第三工程有限公司,西安710016

出　　处：《现代隧道技术》2023年第1期195-201,共7页Modern Tunnelling Technology

基　　金：国家自然科学基金(51979144);水沙科学与水利水电国家重点实验室基金(SKLHSE-2022-D-04)。

摘　　要：对阴离子表面活性剂十二烷基硫酸钠(Sodium dodecyl sulfate,SDS)在不同粒径范围土颗粒表面的吸附、脱附行为进行研究,分析盾构渣土中表面活性剂的吸附、脱附规律,测定土颗粒Zeta电位变化情况,探究通过Zeta电位快速测定SDS吸附量的可行性。结果表明,SDS在粒径较小的土颗粒上的单位平衡吸附量更大;表面活性剂SDS浓度小于其临界胶束浓度时,平衡吸附量随SDS浓度增大而增大,吸附等温线为线性;当浓度大于临界胶束浓度时,平衡吸附量随SDS浓度增大有所降低;渣土粒径越小,SDS的脱附效果越差;SDS的吸附量越大,其脱附率越低;对于粒径小于0.075 mm的土颗粒,通过测定其Zeta电位确定其表面SDS平衡吸附量具有可行性。This paper studies the adsorption and desorption behaviors of anionic surfactant sodium dodecyl sulfate(SDS) on the surface of soil particles in different particle size ranges, analyzes the adsorption and desorption patterns of surfactants in shield soil, measures the changes of zeta potential of soil particles, and investigates the feasibility of rapid determination of SDS adsorption by zeta potential. The results show that the unit equilibrium adsorption capacity of SDS is larger on soil particles with smaller size. The equilibrium adsorption capacity increases with the increase of SDS concentration and the adsorption isotherm is linear when the SDS concentration of the surfactant is less than its critical micellar concentration. The equilibrium adsorption capacity decreases with increasing SDS concentration when the concentration is greater than the critical micelle concentration. The smaller the particle size of the residue, the less effective the SDS desorption. The larger the adsorption capacity of SDS, the lower the desorption rate. It is feasible to determine the surface SDS equilibrium adsorption capacity of soil particles with particle size less than 0.075 mm by measuring their zeta potential.

关 键 词：盾构渣土 十二烷基硫酸钠 粒径范围 吸附 ZETA电位 

分 类 号：U456[建筑科学—桥梁与隧道工程]