【摘要】 【目的】在地质灾害高发的温湿、湿热地区,大部分的山体滑坡常与岩石的风化作用存在一定的关系,为研究在不同湿度条件对岩石风化作用产生的影响,本研究以水汽分子在玄武岩内部的扩散为研究对象。【方法】在常温条件下,假定岩石内部水汽分子贮存浓度达到岩石风化所需的水汽分子贮存浓度值的条件下岩石开始风化,对不同湿度环境下岩石风化进程中水汽分子在岩石内部的扩散进行数值模拟。【结果】模拟结果表明:相对湿度越高,岩石的风化速率越快;理想的岩石风化过程中,风化速率遵循先减小后增大的规律;低湿度条件下,风化速率的变化主要受空气中实际水汽压的控制,高湿度条件下主要受浓度梯度控制。【结论】研究成果对于岩石崩塌、山体滑坡等地质灾害和工程问题具有一定的实际意义。更多还原

【Abstract】 [Purpose] In humid and hot regions of geologic disaster frequently happens, most of the landslides and other geological disasters are often associated with rocks weathering. In order to study the effects of different humidity conditions on rock weathering, the diffusion of water gas molecules in basalt was studied in this paper. [Method] Under the condition of normal temperature, it is assumed that only until the concentration of water molecules in the rock reaches the value of water molecular storage for rock weathering, can the rocks begin to weather. Numerical simulation analysis was carried out of the diffusion of water vapor molecules in the rock during the process of rock weathering in different humidity environments. [Result] The numerical simulation results showed that the higher the relative humidity was, the faster the weathering rate of the rock was. In the course of ideal weathering process, the weathering rate decreased firstly and then increased later. Under the low humidity conditions, the weathering rate was mainly controlled by the actual water pressure. And under the condition of high humidity conditions, it was mainly controlled by the concentration gradient. [Conclusion] The research results have certain practical significance for geological disasters such as rock collapse and landslide and engineering problems.更多还原