Opalinus Clay is the shale currently under investigation as the host formation for geological radioactive waste disposal in Switzerland. Its hydromechanical response has been widely studied, and the experimental results show a range of values whose dispersion needs to be clarified.

This work aims to explain the dispersion in the literature results by correlating the hydro-mechanical response to the mineralogical variability of the tested specimens.

Based on published microstructural studies, the Opalinus Clay shale is herein schematised as a sequence of two kinds of layers: the shaly (high in clay-mineral content) and the sandy (low in clay-mineral content) layers. The mineralogical composition, porosity and hydromechanical parameters are assigned to each layer type. The one-dimensional compressibility and the elastic response of combinations of layers are derived adopting an analytical solution for the stratified, transversely isotropic medium. The drained elastic properties are used to calibrate the approach, and the undrained elastic properties are derived and compared to literature data. Empirical correlations between the layer composition and the geomaterial strength are also drawn.

It is shown that by adopting a layered structure with an alternation of two kinds of layers, most of the variability in the studied geomechanical properties of Opalinus Clay can be captured.

Opalinus Clay是目前正在研究的页岩，是瑞士地质放射性废物处置的宿主地层。其流体力学响应已得到广泛研究，并且实验结果显示出需要澄清其分散程度的一系列值。

这项工作旨在通过将水力响应与被测样品的矿物学变异性相关联来解释文献结果中的分散性。

基于已发表的微结构研究，此处将Opalinus粘土页岩描述为两种层的序列：页岩层（粘土矿物含量高）和沙质层（粘土矿物含量低）。矿物组成，孔隙度和流体力学参数被分配给每种层类型。采用分层横向各向同性介质的解析解，得出层组合的一维可压缩性和弹性响应。排水弹性特性用于校准方法，导出不排水弹性特性并将其与文献数据进行比较。还绘制了层组成与土工材料强度之间的经验相关性。

结果表明，通过采用两层交替的分层结构，可以捕获所研究的Opalinus粘土的地质力学特性中的大部分变化性。