【摘要】 以宁夏岩质文物区域内的典型砂岩(记为A、B)为研究对象,针对其实际的赋存环境进行干湿循环试验,研究砂岩试样的力学特征,分析浸泡在真实水环境中砂岩试样经历不同循环次数后各力学参量的变化规律;并结合SEM观察岩样微观特性。研究结果表明:干湿循环结束后砂岩试样强度具有明显的"弱化"趋势,在干湿循环前期表现更为明显。砂岩A强度下降了74.67%,砂岩B强度下降了45.18%,A对干湿循环作用表现更为敏感。SEM试验结果发现岩石微观结构随着循环次数的增加,其微观结构越松散,颗粒空间排布越不均匀;与宏观试验强度变化结果相吻合,说明岩质文物受水的作用时,干湿循环作用是不可能忽视的影响因素。研究结果为具有宁夏区情的石质岩画文物劣化机理理论、后期保护和修复提供的理论基础。更多还原

【Abstract】 A test scheme of dry-wet cycles was experimented to study the mechanical properties of two typical sandstone specimens( named A and B) from Helan mountainstone relics in Ningxia. The variations of some mechanical parameters of the sandstone specimens immersed in the true water environment after different dry-wet cycle times were analyzed,and then their microscopic characteristics were observed by SEM test. The experimental results indicate that the sandstone specimens have an obvious weakening tendency through dry-wet cycles,which is more significant at prophase of dry-wet cycles. The strength of sandstone A decreases by 74. 67%,and the strength of sandstone B decreases by 45. 18%. So the sandstone A is more sensitive to dry-wet cycles. SEM test results show that with increasing the dry-wet cycle times,the micro structures of sandstone are looser,and the spatial distributions of particles are more uneven,which is consistent with the results of strength change of macro tests. Therefore,dry-wet cycles is an important influencing factor that can not ignored when stone relics are affected by water. The results will provide theoretical basis for mechanism of deterioration,post-protection and restoration of relics of rock paintings in Ningxia region.更多还原