This study examines the compressibility and shear strength of an Indonesian fibrous peat through oedometric and consolidated undrained (CU) triaxial tests. The influence of fibres is considered by preparing two series of specimens – undisturbed and reconstituted. For the latter, the coarse fibres larger than 80 μm were removed by wet sieving. Oedometric test results show that, as the coarse fibres are removed, (a) the secondary consolidation (log t, ε₁) curves change from concave-down to linear and (b) the compression index of the oedometric (log σ_v, e) curves becomes smaller. These observations agree well with previous results on peats from polar and temperate zones. In CU triaxial tests, the undisturbed specimens fail to show strain hardening behaviour in the (ε₁, q) diagram. Their effective friction angle (37·5°) is smaller than the typical values for other fibrous peats (40–60°). By comparing the shear strengths reached at different void ratios for both undisturbed and reconstituted specimens, it was found that the presence of structure adds additional shear strength in undisturbed specimens. With a smaller density, the undisturbed specimens reach the same peak deviator stress (e.g. 100 kPa) as the much denser reconstituted specimens.

中文翻译：

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热带纤维泥炭的可压缩性和剪切强度

本研究通过 oedometric 和固结不排水 (CU) 三轴试验检验了印度尼西亚纤维泥炭的可压缩性和剪切强度。通过准备两个系列的样本来考虑纤维的影响 - 未受干扰的和重组的。对于后者，大于 80 μm 的粗纤维通过湿筛法去除。Oedometric 测试结果表明，随着粗纤维被去除，( a ) 二次固结 (log  t , ε ₁ ) 曲线从凹向下变为线性，( b ) oedometric 的压缩指数 (log  σ _v , e) 曲线变小。这些观察结果与之前关于极地和温带泥炭的结果非常吻合。在 CU 三轴试验中，原状试样在 ( ε ₁ , q ) 图中没有表现出应变硬化行为。它们的有效摩擦角（37·5°）小于其他纤维泥炭的典型值（40-60°）。通过比较原状试样和重构试样在不同空隙率下达到的剪切强度，发现结构的存在增加了原状试样的额外剪切强度。在密度较小的情况下，未受扰动的样本达到与密度更大的重组样本相同的峰值偏应力（例如 100 kPa）。