循环冻融条件下岩石物理特性的试验研究

新鲜岩石和风化岩石的力学性质有着较大的区别,特别是当岩石的风化程度很深时,岩石的力学性质会明显下降,而在实际工程中又常常将风化岩石作为工程的基础,因此,研究和认识风化岩石的力学特性是有必要的.温度的变化是引起岩石风化的主要原因之一,尤其是循环温度变化更容易使岩石风化.将采自焦作的大理岩和砂岩分成干燥和饱和两组岩样,进行了循环冻融试验来模拟岩石的风化.在冻融前、每10次循环冻融后,量测岩样的质量,利用NM-4B非金属超声检测分析仪对各岩样进行超声纵波无损检测,总共进行50次循环冻融.分析了循环冻融对岩石质量损失的影响并就纵波波速的改变进行了比较,据此归纳出岩石材料受风化影响的物理特性.

Test study on physical characteristics of rock under freezing-thawing cycles

The mechanical characteristics of rock are some different between fresh rock and weathering rock. Especially when weathering degree of rock is quite high, the mechanical characteristics of rock obviously declined. In rock engineering many weathering rocks are used as foundations; it is essential to study and understand mechanical characteristics of weathering rocks. The change of the temperature is mainly reason of weathering especially freezing-thawing cycle. In this paper marble and sandstone from Jiaozuo were divided two groups: dry group and water saturation group. And the freezing-thawing cycle test was made to simulate weathering of rock. The mass of rock were recorded and the P-ultrasonic velocity testing was made throughout test including non-freezing-thawing, after every ten times freezing-thawing cycles, the total times of freezing-thawing cycles are 50. We analyze the change of physical and mechanical characteristics of rocks under freezing-thawing cycles.