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以掺天然砂砾改良的红粘土为研究对象,采用室内承载板法测定回弹模量,通过不同初始干密度下的回弹模量试验,深入研究了天然砂砾改良红粘土的回弹模量随初始干密度的变化规律,建立了不同初始干密度下回弹模量的预估模型。试验结果表明:在同一天然砂砾掺量下,随着初始干密度的提高,红粘土的回弹模量逐渐增大。当初始干密度由低向最大干密度增大时,回弹模量增长速度较快,当初始干密度超过最大干密度继续增大时,回弹模量增长速度变缓;在同一初始干密度下,当天然砂砾掺量从0增至30%时,回弹模量的增长幅度较小,当天然砂砾掺量超过30%而继续增长时,回弹模量增长幅度较大;初始干密度由1.6g·cm-3增长至2.0g·cm-3时,回弹模量增长值随天然砂砾掺量的增加而逐渐增大。分别建立了回弹模量随初始干密度及天然砂砾掺量变化的预估模型,通过补充试验,验证了预估模型的准确性。
Taking red clay modified by natural gravel as the research object, the rebar modulus was determined by indoor bearing plate method. Through the test of rebound modulus at different initial dry densities, the elastic modulus of natural grit modified red clay The initial dry density of the law of change, established under different initial dry density of the elastic modulus of the prediction model. The test results show that with the same natural grit content, the elastic modulus of red clay gradually increases with the increase of initial dry density. When the initial dry density increases from low to maximum dry density, the modulus of resilience increases rapidly. When the initial dry density exceeds the maximum dry density, the rebound modulus increases slowly. At the same initial dry density , When the content of natural grit increases from 0 to 30%, the growth rate of the rebound modulus is small. When the content of natural grit exceeds 30% and continues to increase, the elastic modulus increases more greatly. The initial dry density From 1.6g · cm-3 to 2.0g · cm-3, the increment of rebound modulus increases with the increase of natural gravel content. The prediction models of the springback modulus with the initial dry density and the change of the natural gravel content were respectively established. The accuracy of the prediction model was verified by the supplementary test.