污水环境对水泥土力学性能的影响试验研究

由于多数地下水泥土工程直接与地下腐蚀性介质环境接触，必将导致水泥土材料的逐步劣化甚至失效破坏。以某市区工地附近明渠排放的污水作为侵蚀性介质，制作了不同水泥掺量的水泥土试件，通过对比试验，研究了污水环境和清水环境下不同水泥掺量、不同龄期的水泥土抗压强度和抗剪强度。结果表明，在污水或清水环境下，相同水泥掺量水泥土30 d龄期的抗压强度几乎相等，随着龄期的增加其抗压强度均逐步增大，但污水环境下其抗压强度增长的幅度明显小于清水环境，90 d后清水环境的水泥土抗压强度不再增长，而污水环境的抗压强度开始降低；污水环境和清水环境下的水泥土内摩擦角和黏聚力随龄期、水泥掺量的增加均逐步增大，污水环境下龄期90 d后的内摩擦角和黏聚力均开始降低。

Experimental analysis of effects of polluted water environment on mechanical properties of cemented soil

The majority of underground cemented soil projects contact with underground corrosive medium environment directly, which will lead to the deterioration of cemented soil material gradually or even failure. The discharged polluted water from the open channel near construction site is used as a kind of corrosive medium to produce test pieces of cemented soil with different cement content. In both polluted water environment and clean water environment, the compressive strength and shear strength of cemented soil with different cement content and different ages are compared. The results show that when the age is 30 days, compressive strength of cemented soil with the same cement content is almost the same in polluted water environment and clean water environment. Compressive strength of cemented soil gradually increases with the increase of the age. However, the increase extent of compressive strength in polluted water environment is significantly less than that in clean water environment. After 90 days, compressive strength of cemented soil no longer increases in clean water environment, and compressive strength begins to decrease in polluted water environment. The internal friction angle and the cohesion of cemented soil gradually increase with the increase of the age and cement content in polluted water environment and clean water environment. The internal friction angle and the cohesion begin to decrease in polluted water environment after 90 days.