饱水对岩溶灰岩力学性质与纵波波速的影响

Influence of water-saturated state on mechanical properties and longitudinal wave velocity of karst limestone

为研究饱水对岩溶灰岩力学性质和纵波波速的影响,进行自然和饱水状态下岩样的力学性能和弹性波测试。试验结果表明:饱水对岩溶灰岩的单轴抗拉强度、抗拉强度和弹性模量有明显的软化作用,饱水状态试样的峰值应变和泊松比整体上大于自然状态的对应值;岩溶灰岩试样在饱水条件下的纵波波速均明显高于自然状态下的纵波波速,试样的单轴抗压强度和抗拉强度与纵波波速具有较高的线性相关性。基于目前的研究现状,阐述了研究成果在隧道与周边高压充填隐伏溶腔间防突岩层稳定性评价及最小防突厚度确定中的应用。

In order to investigate the influence of saturation on mechanical properties and longitudinal wave velocity of karst limestone ,the experiment to on the mechanical property and the elastic wave velocity of karst limestone under natural and saturated condition was conducted .The results are as follows ：Saturation has a significant influence on the softening of uniaxial compressive strength ,tensile strength and elastic modulus of karst limestone ,and peak strain and poisson＇s ratio of saturated sample are larger than corresponding values of natural specimen on the whole .The longitudinal wave velocity of water‐saturated sample is significantly higher than that under natural condition ,and the uniaxial compressive strength and tensile strength of specimen under two condition have a significant linear relationship with elastic wave velocity .Based on the current studies ,he results are used to assess the stability of rock pillar between tunnel and concealed karst cave with high pressurized water ,and calculate the minimum anti‐inrush thickness .