## 1 Introduction  
Due to the low bearing capacity and high compressibility of soft clay, soft clay foundation is often encountered in engineering construction, and it needs to be reinforced. Compared with the commonly used soft clay foundation reinforcement methods, the electro-osmotic consolidation method has the advantages of low noise, good reinforcement effect, and relatively simple construction equipment. The electro-osmotic consolidation method is considered to be a soft clay reinforcement method with good development prospects. However, there are many influencing factors of electro-osmosis. At present, many influencing factors of electro-osmosis have not been fully considered and studied, and the efficiency of electro-osmosis in strengthening soft clay can be further improved. Therefore, it is of great significance to further study the influencing factors of electro-osmosis.  
At present, scholars at home and abroad have conducted some related research on the influencing factors of electro-osmosis, including the influence of electrode materials [1; 2; 3; 4], grouting solution [5; 6; 7; 8; 9; 10], external load [11; 12], electrifying mode [13; 14; 15; 16; 17; 18; 19; 20], soil properties [21; 22; 23; 24; 25], and other factors on electro-osmosis consolidation. [PERSON] al. [5; 6; 7] verified through model tests that Na\({}_{2}\)SiO\({}_{3}\) and CaCl\({}_{2}\) solutions as grouting solutions can effectively improve the drainage rate of soft clay during electro-osmosis. [PERSON] et al. [8] carried out the model test of soft clay reinforced by CaCl\({}_{2}\) solution. The results show that CaCl\({}_{2}\) solution can effectively control the decreasing trend of current and improve the shear strength of soil samples near the anode after electro-osmosis. [PERSON] [9] verified by model test that the strength of soft clay can be greatly improved after adding Ca\({}^{2+}\)-containing solution and electro-osmosis. [PERSON] [10] verified by model test that filling Al\({}_{2}\)(SO4)\({}_{3}\) solution in soft clay can effectively improve the electro-osmosis efficiency. At present, few scholars have studied the influence of anode filled with FeCl\({}_{3}\) solution on soft clay electro-osmosis. During winter construction, low temperature will reduce the migration rate of ions during electro-osmosis, which is another important factor affecting the electro-osmosis consolidation of soft clay. However, there is no relevant research by scholars. Therefore, it is necessary to study the influence of low temperature environment and anodic filled with FeCl\({}_{3}\) solution on electro-osmosis of soft clay via an experiment.  
In this paper, the electric current, pH value, and displacement of soft clay with water content of 35-55% in a normal temperature environment and low temperature environment were measured by a self-made device, and the corresponding electric permeability coefficient and energy consumption coefficient were calculated. The resistivity and potential difference of an anode without grouting, filling water, and FeCl\({}_{3}\) solution were measured at normal temperature by improved Miller Soil Box, and resistivity and anode potential difference after anode grouting and FeCl\({}_{3}\) solution filling at low temperature were measured, as well as anodic potential difference and current in frozen soft clay with 40% moisture content. According to the test results, the effects of anode grouting FeCl\({}_{3}\) solution on the current, pH value, drainage amount, anode potential difference, electrical permeability coefficient, energy consumption coefficient, and resistivity of soft clay during electro-osmosis at low temperature were analyzed in order to provide a reference for engineering practice.