Abstract The shearing behaviour of organic soils, such as peat, under monotonic loading can be very different than those of inorganic soils due to the presence of fibers. A series of one-dimensional consolidation, direct simple shear, and bender element tests are conducted to investigate the compressibility and the monotonic shear strength of a peat deposit from the Port Lands area of Toronto, Ontario, Canada. Laboratory specimens are trimmed from block samples collected from a depth of about 4.0 to 4.5 m. The samples' organic content ranges from about 42% to 60%, with a fiber content of 20% to 30%. Because of their moderate organic and water (180%–237%) contents, the peat samples are found to be less compressible with a slower consolidation rate than several other surficial peat deposits reported in the literature. All samples exhibit a ductile shearing behaviour with undrained strength ratios ranging from 0.32 to 0.57 and a residual effective friction angle of about 30°. The monotonic tests are further examined within the framework of critical state soil mechanics. Bender element measurements are used to develop empirical relationships between several engineering parameters of Toronto peat with shear wave velocity.

中文翻译：

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多伦多泥炭的可压缩性和单调剪切行为

摘要 由于存在纤维，有机土壤（如泥炭）在单调载荷下的剪切行为可能与无机土壤的剪切行为大不相同。进行了一系列一维固结、直接简单剪切和弯曲单元测试，以研究加拿大安大略省多伦多港地区泥炭沉积物的可压缩性和单调剪切强度。实验室标本是从从大约 4.0 到 4.5 m 的深度收集的块状样品中修剪的。样品的有机含量约为 42% 至 60%，纤维含量为 20% 至 30%。由于其中等有机物和水 (180%–237%) 含量，与文献中报道的其他几种表层泥炭沉积物相比，泥炭样品的可压缩性较低，固结速度较慢。所有样品均表现出韧性剪切行为，不排水强度比范围为 0.32 至 0.57，残余有效摩擦角约为 30°。在临界状态土壤力学的框架内进一步检查单调测试。Bender 元素测量用于开发多伦多泥炭的几个工程参数与剪切波速度之间的经验关系。