Experimental Study On Compaction Behavior And Particle Crushing Of Sandstone-mudstone Particle Mixture

Because of sandstone, mudstone and sandy mudstone interbedding of geological conditions in the Yangtze river shelter-forest region distribution are very wide, also convenient to use local materials, so the particles of sandstone, mudstone and sandstone-mudstone mixture are often as architecture. In order to understand compaction characteristics of the sandstone-mudstones particles mixture is, this article selects Chongqing region granular materials, widely distribution of sandstone particles, mudstone particles, sandstone-mudstone particles material as the research object. Indoor compaction test were carried out to study the compaction characteristics of sandstone particles, mudstone particles, sandstone-mudstone particles, and through the screening method to study the compaction process of particle breakage problem. According to test results, discusses the factors of mudstone particle content, grain size distribution, compaction function on the compaction characteristics and particle breakage, and illustrates the mechanism of sand shale particle material crushing. Finally, from the soil particle size distribution, moisture content and compaction discusses the mixed sand shale particle material compaction quality control index. The main work and achievements are obtained as follows:(1) Through the compaction test to get the maximum dry density and optimum moisture content of sandstone particles, mudstone particles, sandstone-mudstone particles under the different grading, compaction function condition. According to test results, discusses the factors of mudstone particle content, grain size distribution, compaction function on the compaction characteristics. In general, particle level matching sand shale particle material of maximum dry density effect is not obvious. But with the optimal moisture content values were uneven coefficient, coefficient of curvature, d90, d60, d50, d30, d10tends to reduce the change with the increasing of particle size. Maximum dry density value increases with the increase of compaction feature, when the function is greater than the standard compaction compaction function, the rate of maximum dry density increase was decrease. Conclusion contrast:sandstone particles with mudstone particle concentration ratio of4:6, the compaction effect is best.(2) For sandstone particles, mudstone particles and sandstone-mudstone particles mixed:particle breaking rate is not closely related to the uneven coefficient, but as the curvature coefficient, d90, d60, d50, d30, d10particle size increases, the situation is more serious. Coarse material content, the more grain breakage. Under the same compaction function, mudstone particle sandstone particles are more easily broken. When sand mudstone mixed grain, along with the increase in mudstone material content, the more serious the particle breakage.(3) For the actual project both sandstone particles, mudstone particles and sandstone-mudstone particles mixed can be carried out in accordance with the design gradation3to material, so that can achieve a good compaction effect. On the analysis of the compaction test data shows that for the moisture content of the scene compaction packing changes can meet the requirements in a wide range, for the selection of the compaction degree may follow various norms and standards for selection.