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

本文研究常滑泥岩的湿化特性，并提出一个描述常滑泥岩湿化特性的本构方程“超荷面剑桥模型”。在试验研究中，对泥岩碎石在饱和和干燥条件下进行了一维和三轴压缩试验。考虑了泥岩卵石粒径的宽范围和窄范围。试验结果表明：（1）在大范围内卵石的试验过程中，均未出现次固结现象; 2)干样品，虽然最初具有非常高的强度，表现出更大程度上的熟化行为比饱和的，当加入水。当试件承受恒定压力时，即使压力低于残余强度，也会发生渐进破坏。提出了一种能反映土的正常固结、超固结和不可能固结状态的“超荷面剑桥模型”。

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.