期刊：
E3S Web of Conferences,2020年143:01033 ISSN：2555-0403
通讯作者：
Liu, J.
作者机构：
[Liu J.] School of Civil Engineering and Architecture, Wuhan Polytechnic University, China;[Zhang H.] Graduate School of Engineering, Kobe University, Japan
通讯机构：
[Liu, J.] S;School of Civil Engineering and Architecture, China
会议名称：
2nd International Symposium on Architecture Research Frontiers and Ecological Environment, ARFEE 2019
摘要：
Graphene oxide (GO) is increasingly used in various applications, and the implications of this nano-sized material entering the natural environment are of great interest. GO is highly soluble in water, and its accumulation in soil could significantly alter the physical and mechanical properties of the soil. In this laboratory study, we mixed GO with a soil (clayey sand, SC) to systematically study the engineering properties and microstructure of the modified soil. The experimental results reveal that the physical and mechanical properties and microstructure of clayey sand can be significantly changed by the addition of a minute quantity of GO. The liquid limit and plasticity index of the soil steadily increased (up to a GO concentration of 0.08 wt%), whereas the plastic limit did not change significantly. The addition of GO (up to 0.08 wt%) into the soil generally decreased the soil's void ratio under a given hydrostatic consolidation pressure, while increasing its undrained shear strength. Such remarkable modifications of soil by minute amounts of GO can be attributed to the extremely high specific surface area of GO and its stable dispersion in water.
关键词：
Alternating pulse electric field;Calcium chloride;Electroosmosis;Reinforcement;Scanning electron microscopy;Weak soil
摘要：
Electroosmosis has been extensively employed as an effective method for the dewatering treatment of soils and thus the reinforcement of weak soils. At the microscopic level, this treatment process is inherently complex due to in situ chemical and electrochemical reactions, migration of ions and particles, and the dependence of zeta potential of various particles on the local pH value in the soil. This complexity has hindered further understanding of mechanisms underlying the electroosmosis technology. Here, we design an external electric field in which alternating pulse wave potentials were partially used to adjust the pH value of the soil and manipulate the dynamics of in situ formed nanoparticles and their interconnectivity. The experimental results reveal that the in situ formation of Ca-rich particles, instead of water drainage, may serve as the main mechanism underlying the observed soil reinforcement when using calcium chloride as the treatment electrolyte. The interconnectivity of such particles may be the key for the shear strength improvement without significant settlement of the soil.
摘要：
Based of the fact that the theoretical study of the short-leg shear wall falls behind the practice in China, cyclic reversed loading tests on six reinforced short-leg shear walls with 1:2 scales are carried out. The damage form and working capability of the specimen show that the final damage of the specimens are caused by the failure of the connecting beam, which is the weak part of the structure. The loading capacity of SLSW with flanged-walls is better than those without flanged-wall. Finite element analysis software is used to establish a part entity FE model of the SLSW The working performance of the SLSW in the building is analyzed. Based on the test and calculation achievements, some beneficial suggestions are put forwarded for the selection of this structure in high-rise building.
