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    掺砂对崩岗土壤无侧限抗压强度的影响

    Effects of mixing sand on unconfined compressive strength of soil in collapsing gully

      摘要
    • 摘要:
      目的为了探索混合的砂土崩积堆发生二次崩塌时的力学特性，进行不同类型崩积堆室内模拟试验，探究其无侧限抗压强度变化规律及崩塌特性。
      方法本文采用无侧限抗压强度指标实验，设计2种掺砂方式（分层掺砂和混合掺砂）和5种掺砂水平（0%、25%、50%、75%、100%），模拟不同掺砂方式和掺砂量对崩积堆力学特性的影响。
      结果掺砂量越大，无侧限抗压强度越小，掺砂量从0%增加至100%，强度从71.1 kPa下降为14.6 kPa；分层掺砂的试样，下层极不稳定，试样的强度小且破坏严重，同一掺砂量，混合掺砂试样的无侧限抗压强度大，掺砂量为25%、50%、75%时，混合掺砂的无侧限抗压强度值比分层掺砂分别提高了53.28%、106.33%、21.13%；掺砂量低且混合掺砂时土体的无侧限抗压强度值大，上下层混合均匀的试样发生二次崩塌的可能性小。
      结论掺砂量显著降低了崩岗岩土无侧限抗压强度，掺砂量低时试样呈块状塌落，掺砂量高时呈碎屑状。同一掺砂量，混合掺砂较分层掺砂提高了无侧限抗压强度。

       

      Abstract:
      ObjectiveIn order to study the mechanics characteristic of colluvial deposits of collapsing gully, soil simulation of the collapsing had been made and the unconfined compressive strength was measured.
      MethodTwo methods to mix the sand and soil and different sand content were taken.
      ResultThe results showed that unconfined compressive strength reducted along with the reduction of sand content because of the lesser axial stress. From 0% to 100% of sand content, unconfined compressive strength reduction from 71.1 kPa to 14.6 kPa. The specimen mixed sand to soil with separated layer destroyed seriously and the strength was smaller result to the unstable substratum. The highest strength occurred to the specimen which was low sand content and mixed uniformly.
      ConclusionMixing sand dramatically reduces the unconfined compressive strength of soil in collapsing gully. Under the same sand content circumstances, specimen mixed uniformly has a high strength and brittle failure at the end of test.

       

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