Experimentals On Mechanical Properties Of Reinforced Silt-Solidified Soil Through Waste Masks

The utilization technology and engineering practice of sludge solidification filler have been widely used at home and abroad.It is of great guiding significance to find out the mechanical characteristics and deformation characteristics of sludge solidification soil for the design and construction of sludge solidification engineering.The existing research results show that the technology of reinforced soil with geomaterials is an effective soil improvement technology.Geotechnical materials or fibers can not only effectively improve the strength of soil,but also effectively inhibit the development of soil cracks,change the brittle characteristics and permeability of soil and reduce the deformation of soil.In recent years,due to the advantages of good reinforcement effect and good economic benefits,fiber reinforcement technology has attracted the attention of many experts and researchers in the field of geotechnical engineering.In this paper,the strength characteristics,deformation characteristics and failure characteristics of waste mask reinforced soil are analyzed through compaction test,unconfined compressive strength,splitting tensile strength test,consolidation test,triaxial consolidation undrained compression test.The effects of mask content,mask area and mask aspect ratio on the mechanical properties of solidified soil were analyzed.Compared with the reinforcement effect of polypropylene fiber,glass fiber and other reinforced materials.Reveal the mechanical characteristics of waste masks as reinforced materials mixed with solidified soil.The feasibility of using waste masks as reinforced materials mixed with engineering shield tailings to form reinforced solidified soil as subgrade filler is preliminarily discussed.Under the experimental conditions in this paper,the following main conclusions can be drawn:(1)The unconfined compressive strength and splitting tensile strength of solidified soil are effectively improved by adding waste masks.When the mask size is D(2cm×0.25cm)and the content is 0.3%,the compressive strength and tensile strength of the solidified soil are1250 k Pa and 145 k Pa,which are increased by 178% and 159.6% respectively.The content of mask,the aspect ratio of mask and the length of mask are the factors that affect the strength and ductility of solidified soil.In order to effectively improve the compressive strength and splitting tensile strength of the solidified soil reinforced with wasted masks,it is suggested that the best mask content should be 0.3%.(2)When the mask size is the same,with the increase of the mask content,the void ratio of the mask reinforced solidified soil gradually decreases.When the consolidation pressure is less than 800 k Pa,the compressive modulus first increases and then decreases.when the consolidation pressure is between 800 and 1600 k Pa,the compressive modulus first decreases,then increases and then decreases.The overall compressive strain decreases first and then increases.When the mask content is 0.3%,the compressive modulus reaches the peak and the compressive strain is relatively small,which shows a good anti-deformation effect.The difference of mask size has little effect on the compressive strain of solidified soil,and the difference between each group of samples is between 0.017%～0.650%.(3)Mask can effectively improve the stress and strain of solidified soil,and improve the brittle failure characteristics of solidified soil,with the stress increasing range of 12%～18%.After adding the mask,the shear strength and deformation resistance of solidified soil are improved,and the shear strength indexes c and φ are significantly affected,and the maximum cohesion is obtained when the mask content is 0.3%.The reinforcement effect of the mask effectively improves the axial failure stress of the solidified soil,and the high confining pressure promotes the reinforcement effect of the mask more obviously.Compared with the reinforcement effect of polypropylene fiber reinforced solidified soil and glass fiber,it is confirmed that the addition of mask is 0.3%.