国家自然科学基金项目(51608436, 51778528)；西安理工大学省部共建西北旱区生态水利国家重点实验室（No. 2019KJCXTD-12）
1.Xi'2.'3.an University of Architecture and Technology;4.an University of Technology
Project supported by the National Natural Science Foundation of China (Grant No.51608436, 51778528)； the Research Fund of the State Key Laboratory of Eco-hydraulics in Northwest Arid Region, Xi’an University of Technology (Grant No. 2019KJCXTD-12)
After loess is contaminated, the composition and internal structure of the soil will change, so that the tensile strength of the soil will also change. Based on this, in this paper, 4 kinds of polluted liquids with different molar concentrations of hydrochloric acid, sulfuric acid and nitric acid were manually configured, and the direct tensile failure test was carried out by comparing distilled water and contaminated soil samples, and discussed the tensile stress-tensile strain characteristics and process. The effects of different acid solution types and concentrations on the evolution of soil tensile strength were further analyzed. The results show that the tensile strength of loess is lower than that of the unpolluted state with the invasion of the acid polluted liquid. With the increase of the concentration of the contaminated solution, the tensile strength of both hydrochloric acid and nitric acid decreased, while that of sulfuric acid gradually recovered. The fitted concentration of the contaminated solution showed a good power function relationship with the tensile strength. Finally, based on the tensile strength and shear strength of the polluted loess, the fitting relationship of the combined shear strength of contaminated loess were discussed.