降雨条件下新型固化剂改良黄土边坡稳定性研究

Study on Loess Slope Stability Improved by New Curing Agent under Rainfall Condition

我国西北等地区分布着大量的黄土,随着工程建设的不断发展形成了大量的黄土边坡,在降雨和冻融等环境下黄土边坡的稳定性与工程安全息息相关。通过新型高分子固化剂对黄土进行改良,并通过室内模拟试验,研究了改良黄土边坡的保水性、抗冲刷性、抗压强度和抗冻性等性能,并结合微观分析探索其改良机理。研究结果表明:固化剂改良黄土边坡具备更加优异的保水性、抗雨水冲刷性和抗冻性能,且改良效果与固化剂的掺量呈正相关,但是固化剂掺量达15%后,改良效果提升幅度大幅降低,实际工程固化剂掺量以15%为最佳;固化剂的改良机理主要是以网状结构包裹黄土颗粒,增强颗粒之间的粘结性,减小孔隙率。上述研究成果能为新型固化剂在复杂环境下的应用和推广提供理论指导。

A large amount of loess is distributed in northwest China.With the continuous development of engineering construction,a large number of loess slopes are formed.The stability of loess slopes is closely related to engineering safety under rainfall and freeze-thaw.In this paper,a new polymer curing agent was used to improve loess.The water retention,scour resistance,compressive strength and frost resistance of improved loess slope were studied by laboratory simulation test.The improvement mechanism was explored by microscopic analysis.The results show that the modified loess slope with curing agent has excellent water retention,rain erosion resistance and frost resistance.Moreover,the improvement effect is positively correlated with the dosage of the curing agent.However,the improvement effect is significantly reduced when the curing agent content reaches 15%,and the optimal curing agent content is 15%.The improvement mechanism of the curing agent is that the loess particles are wrapped by the network structure,which enhances the adhesion between particles and reduces the porosity.The above research results can provide theoretical guidance for the application and promotion of new curing agent in complex environment.