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为了改善传统生土材料的力学性能和耐久性能,对掺加一定比例水泥、石灰、砂子、麦秸秆等掺料的干燥改性生土试块进行直接剪切试验,得到改性生土试块的破坏形态、破坏过程、剪应力-剪切位移关系曲线、抗剪强度与垂直压力的关系曲线以及受剪极限承载力;对比分析掺加不同改性材料以及同种材料不同比例对生土块材的强度和变形性能的影响规律,研究各种掺料对生土块材性能产生影响的机理;设计专门用于研究生土块材抗剪性能的推剪试验,探索能正确反映生土结构中土体抗剪性能的试验方法。
In order to improve the mechanical properties and durability of traditional raw soil materials, a direct shear test was carried out on the dry modified natural soil samples with a certain proportion of admixtures such as cement, lime, sand and wheat straw to obtain modified soil test blocks The failure state, the failure process, the relationship between shear stress and shear displacement, the relationship between shear strength and vertical pressure and the ultimate bearing capacity of shear strength were analyzed. By comparing the different modified materials with different proportions, The strength and the deformation of the material properties of the law to study the effect of various admixtures on the performance of the raw material block mechanism; designed specifically for the study of the shear resistance of the pedestal bulk pruning shear test to explore correctly reflect the structure of the raw earth Test method of soil shear resistance.