## 1 Introduction
[5], in order to verify the effect of the content of cementitious materials on the strength, the test showed that the greater the proportion of cementitious materials, the greater the unconfined compressive strength of the soil samples when the proportion of cementitious materials for the proportion of 20%, the unconfined compressive strength of soil samples of the 28d can be up to 365 kPa. [PERSON] et al. [13] investigated the effect of steel slag on the hydration properties of cement. Steel slag, sharing comparable chemical compositions with cement, demonstrates activated cementitious properties through physical grinding or chemical activation. Its cementitious components participate in hydration reactions to form products such as ettringite (AFt), while inert components optimize pore structure through physical filling. When combined with cement, steel slag delays early-stage hydration (by reducing AFt formation and inhibiting C-S-H growth), enhancing strength development, and found that the admixture of steel slag retarded the hydration reaction of cement and the compressive strength of steel slag cement with standard curing for 90d was lower than the compressive strength of pure cement. Many scholars in China have also studied the properties of cement-bentonite slurry materials through various theories and tests. The net-like structure in bentonite can inhibit its effective expansion, and also inhibit the drying shrinkage of cement, effectively preventing the intrusion of harmful leachate. [PERSON] et al. (2014) showed that increasing the dosage of bentonite reduces the content of Ca\({}^{2+}\) while the porosity of the cement paste is reduced. [PERSON] (2015) combined with Wuhan Tiandi, Yulong Plaza, and other foundation pit support projects through indoor tests, obtained the cement--fly ash--bentonite different mixing ratios on the compressive strength and shear strength. The test showed that the same ratio of cement soil unconfined compressive strength and cohesion ages and increases with bentonite dosages of 5% to 11%, a fly ash dosage in the range of 20-30, and maintenance of an unconfined compressive strength of 28d soil sample reaching 7 MPa. [PERSON] et al. (2016), in order to study the interaction between the erodibility of damaged seepage barriers and cementitious materials and water flow based on indoor pinhole erosion tests, calculated the percentage of erosion and established the relationship with the age of curing, erosion time, and the size of the initial hole. The results indicate that the curing time affects the hydraulic conductivity in the macro-structure of the barrier; the growth of the erosion time, the material erodes quickly at the initial erosion rate, then slows down, and finally tends to a stable state; the different erosion conditions during the curing period are affected by the size of the initial hole. It is concluded from the study that the cement-bentonite material is optimized when the bentonite dosage is 18%. In this study, multiple sets of parallel specimens were prepared to systematically investigate the influence of steel slag substitution rates and bentonite dosage on the mechanical and hydraulic properties of barrier materials. Unconfined compressive strength tests, direct shear tests, and variable head permeability tests were conducted to quantify the variations in compressive strength, cohesion, and permeability coefficients. But for the high-bentonite content system in the lesser described situation, this paper, in addition to investigating steel slag to improve the bentonite environment (46-54%), also makes up for the low-bentonite content system of some problems. Furthermore, the correlation between cohesion and unconfined compressive strength was analyzed to establish an empirical relationship. The experimental design aimed to elucidate the governing laws of parameter interactions under controlled conditions.