Engineering Geology ( IF 7.4 ) Pub Date : 2021-07-22 , DOI: 10.1016/j.enggeo.2021.106293 M. Gasc-Barbier , V. Merrien-Soukatchoff , D. Virely
Rock instabilities can represent major risks for local populations depending on their geographical location. Even if different mechanisms are known to trigger rockfalls such as precipitation, seismic activity and freezing, many rockfalls occur during periods when such trigger mechanisms are absent. Some recent studies have pointed out the role of thermal cycling in crack initiation or propagation. Here we use data from nearly five years of field monitoring of a French limestone cliff. Evolution of the aperture of joints were followed as well as displacements and temperature deep in the rock mass. We show that seasonal thermal variation affects the rock at depths of up to 6 m and subcritical cracking can probably appear even at this depth.
中文翻译:
自然热循环对石灰岩悬崖力学行为的影响
岩石不稳定性可能代表当地人口的主要风险,具体取决于他们的地理位置。即使已知不同的机制触发落石,如降水、地震活动和冻结,许多落石发生在没有这种触发机制的时期。最近的一些研究指出了热循环在裂纹萌生或扩展中的作用。在这里,我们使用了近五年对法国石灰岩悬崖进行现场监测的数据。节理孔径的演变以及岩体深处的位移和温度被跟踪。我们表明季节性热变化会影响最深 6 m 的岩石,即使在这个深度也可能出现亚临界裂纹。