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针对目前常规确定岩石力学参数的方法只能得出岩块的整体强度,不能反映古建筑石质构件风化层内力学参数逐渐变化,无法很好地满足石质古建筑稳定性、耐久性研究的不足,提出了综合运用现场穿透波CT测试、表面回弹测试和室内试验确定风化石质构件力学参数的方法。方法的实施主要包括:通过现场穿透波CT测试,获得纵波波速在石质构件深度剖面上的分布;现场选取与欲研究的石质构件类似的岩石做室内力学试验和波速测试,得出力学参数与波速的统计关系;上述两者结合得出力学参数在石质构件深度剖面上的分布,在此基础上分析风化层内力学参数随深度的变化关系;对不同风化分区代表性石构件进行风化深度研究和表面回弹测试,得出构件表面强度比与风化深度的关系。以义乌宋代古月桥为例,对其方法进行了系统的介绍,并对古月桥承载条石风化层内力学参数随深度的变化关系以及表面强度与风化深度的关系进行了研究。研究表明:义乌宋代古月桥承载条石风化层内的抗压强度比、弹性模量比随深度呈负指数关系变化;表面强度比与风化深度呈2次多项式关系。
According to the conventional methods of determining rock mechanics parameters, the overall strength of rock mass can only be obtained, which can not reflect the gradual change of mechanical parameters in the weathering layer of ancient building stone components, and can not meet the requirements of the stability and durability of ancient stone buildings The author put forward a method to determine the mechanics parameters of weathered stone components synthetically using the penetrating wave CT test, surface rebound test and laboratory test. The implementation of the method mainly includes: obtaining the distribution of longitudinal wave velocity on the depth profile of the stony component through the on-site penetrating wave CT test; selecting the rock similar to the stony component to be researched on site to do the mechanics test and the wave velocity test, And the statistical relationship between the parameters and the wave velocity. The distribution of the mechanical parameters on the depth profile of the stony component is obtained by combining the above two. On this basis, the relationship between the mechanical parameters and the depth of the weathering layer is analyzed. Weathering depth and surface rebound test, the relationship between the surface strength ratio and the weathering depth is obtained. Taking the ancient Moon Bridge of Yiwu in Song Dynasty as an example, the method is introduced systematically. The relationship between the mechanical parameters of the weathering bearing layer of Guyue Bridge with depth and the relationship between surface strength and weathering depth is studied. The results show that the ratio of compressive strength and modulus of elasticity in the weathering bearing layer of the Wuyue Bridge in the Song Dynasty in Yiwu are negatively exponential. The relationship between the surface intensity ratio and the weathered depth shows a 2-order polynomial relationship.