Failure Pattern of Reinforced Saline Soil with Wheat Straw and Lime

Failure pattern of soil is the comprehensive expression for the magnitude and status of stress, and displays the microstructure characteristic from macroseopic view. Analysis on shear failure patterns of soil, that of saline soil, reinforced saline soil with wheat straw, lime-soil, and reinforced lime-soil with wheat straw, are carried out. Results present that:①Both saline soil and reinforced saline soil with wheat straw display the failure in plastic manner, which showing a typical swelling shape in saline soil. The lateral deformation of reinforced soil is far less than that of saline soil because of reinforcement function. ②Lime-soil and reinforced lime-soil with wheat straw are all plastic in early curing-day, and brittle in later curingday, however, the fracture surface of reinforced lime-soil is more irregular than that of lime-soil. ③Fracture of reinforeed soil in low confining pressure condition is more complex than that of in high confining pressure condition, because constraint force mainly comes from reinforced function in low confining pressure, but comes from reinforced and solidified function in high confining pressure condition. ④Reinforced function can constraint deformation, failure position always locate in the un-reinforced position as reinforcing in different areas. Reinforcement with wheat straw and lime can not only more effectively increase antideformation and strength of soil, but also solve the shrinkage crack problem of lime soil. As a result, it is an effective method to improve the saline soil by reinforced with lime and wheat straw.