The influence of petrophysical properties on the salt weathering of porous building rocks
The influence of petrophysical properties on the salt weathering of porous building rocks
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DOI：
10.1007/s00254-006-0475-y
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发表时间：
2007-03-01
期刊：
影响因子：
--
通讯作者：
Canaveras, J. C.
中科院分区：
文献类型：
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作者：
Benavente, D.;Cueto, N.;Canaveras, J. C.
通过全面的岩石特征和统计分析，评价了孔隙结构、水分运移特性和岩石强度对盐风化的影响。孔结构用孔隙率、孔径分布(用平均孔半径量化)和比表面积来描述，密度和水的运移用水渗透(饱和流动)和毛细渗透(非饱和流动)来表征，而岩石强度试验是用单轴压缩强度、纵波和横波速度来进行的，通过对传输信号的数字分析得到动态弹性常数和波形能量和衰减。采用主成分分析和逐步多元回归模型研究盐岩风化与岩石物性之间的直接关系。从主成分分析中得到两个主成分，并赋予它们岩石物理意义。第一个组分主要与力学性能、孔隙率和密度有关，而第二个组分与水的运移和孔隙结构有关。盐风化作用由盐结晶后的重量损失百分比来量化，这两个主成分都包括了盐风化作用，这表明它依赖于它们的岩石物理性质。逐步多元回归分析发现，岩石强度在盐风化预测中的统计权重占主导地位，水分运移和孔隙结构参数的贡献较小。
The influence of pore structure, water transport properties and rock strength on salt weathering is evaluated by means of a thorough rock characterisation and a statistical analysis. The pore structure was described in terms of its porosity, pore size distribution (quantified by mean pore radius) and specific surface area, density and water transport was characterised by means of water permeability (saturated flow) and capillary imbibition (unsaturated flow); whilst the rock strength test was carried out using uniaxial compressive strength, compressional and shear wave velocities, dynamic elastic constants and waveform energy and attenuation were obtained from the digital analysis of the transmitted signal. A principal component analysis and a stepwise multiple regression model was carried out in order to examine the direct relationships between salt weathering and petrophysical properties. From the principal component analysis, two main components were obtained and assigned a petrophysical meaning. The first component is mostly linked to mechanical properties, porosity and density whereas the second component is associated with the water transport and pore structure. Salt weathering, quantified by the percentage of weight loss after salt crystallisation, was included in both principal components, showing its dependence on their petrophysical properties. The stepwise multiple regression analysis found that rock strength has a predominant statistical weight in the prediction of salt weathering, with a minor contribution of water transport and pore structure parameters.