Mechanism of slaking behavior of Tertiary crushed mudstones and use of mudstones for embankments

本文研究了Tokoname泥岩的流变特性，并提出了一个描述其流变特性的本构方程“超加载表面-粘土模型”。在试验研究中，对破碎泥岩在饱和和干燥条件下进行了一维和三轴压缩试验。泥岩卵石的尺寸范围有宽有窄。结果表明：1)在大尺寸卵石试验中，均未出现二次固结现象。(2)干燥试样的初始强度虽然很高，但加入水分后，其软化程度大于饱和试样。当试样承受恒定压力时，即使压力低于残余强度，也会发生渐进式破坏。提出了“超荷载表面cami -clay模型”来表达土体的各种状态，正常固结、超固结和不可能固结状态。

This study is concerned with the slaking behavior of Tokoname mudstones, and to suggest a constitutive equation "the Super-loading surface Cam-clay model, " to describe its behavior. In the experimental study, one dimensional and triaxial compression tests were carried out on crushed mudstone in saturated and dry conditions. A wide range and a narrow range for the size of mudstone pebble were considered. These tests led to the following conclusions : 1) No secondary consolidation was exhibited during tests on specimens with pebbles in the wide range size. 2) The dry samples, although initially with very high strength, exhibited slaking behavior to a larger extent than the saturated ones, when water was added. Progressive failure occurred when the specimen was subjected to constant pressure, even if it was lower than the residual strength. "The Super-loading surface Cam-clay model" is suggested to express every state of soils, normal consolidated, overconsolidated and impossible states.