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SOUTH AUSTRALIAN COLLAPSING SOILS

机译：南方收割土壤

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摘要

The study was designed to evaluate and compare typical collapsing soils from South Australia and to evaluate the use of such soil in pavement construction after chemical stabilization with cement and rice husk ash (RHA). The three soils in the study were classified as silty sands, usually with calcium carbonate. Shear strength decreased markedly with inundation. In the natural state, a severe degree of collapse could be reached following saturation. The stabilization of soil from Port Augusta resulted in reduction of the collapse index and an increase of the shear strength. Even after heavy compaction, the soil still had slight potential for collapse upon wetting. On the other hand, the chemically stabilized and compacted soil exhibited minor swelling upon wetting. The saturated shear strength of compacted soil increased when compared to that of undisturbed soil. For evaluation of application of the stabilized soil in pavement construction, the California Bearing Ratio (CBR), unconfined compressive strength and durability were determined. Based on the soaked CBR and strength tests, the non-stabilized, compacted soil was classified as a good sub-grade. The chemically stabilized soil with a low percentage of additives could be used as a sub-base. However durability testing indicated stabilization with either 6 percent cement and 2 percent RHA is required. Further work is required to determine the resilient properties of compacted stabilized collapsing soil.
机译：该研究旨在评估和比较来自南澳大利亚的典型塌陷土壤，并评估在用水泥和稻壳灰（RHA）化学稳定后这种土壤在路面施工中的用途。研究中的三种土壤被分类为粉砂，通常含有碳酸钙。剪切强度随浸水而显着降低。在自然状态下，饱和后可能达到严重的坍塌程度。来自奥古斯塔港的土壤的稳定化导致塌陷指数的降低和抗剪强度的提高。即使经过重压实，土壤在润湿时仍然具有轻微塌陷的可能性。另一方面，化学稳定和压实的土壤在润湿时表现出较小的溶胀。与未扰动土相比，压实土的饱和剪切强度增加。为了评估稳定土在路面施工中的应用，确定了加利福尼亚承载比（CBR），无侧限抗压强度和耐久性。根据浸泡的CBR和强度测试，将未稳定的压实土壤分类为良好的基层。化学添加剂含量低的化学稳定土壤可用作底基。但是，耐久性测试表明需要使用6％的水泥和2％的RHA来稳定。需要进一步的工作来确定压实的稳定塌陷土壤的弹性。

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