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含充填物的大理岩裂隙扩展过程及破坏特性

Keywords: 剪切破坏,粗粒大理岩,裂隙岩体,充填裂隙

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Abstract:

为了进一步了解非直裂隙的破坏机理,以天然粗粒大理岩及含不同充填物的大理岩为研究对象,采用全自动化雕刻设备进行裂隙试件制作,然后分别对“/冶型裂隙试件和“S冶型裂隙试件进行单轴压缩试验.试验结果表明:1)在压缩试验中,“/冶型和“S冶型裂隙试件均发生剪切破坏,其破坏迹线基本一致;2)在同样外荷载作用下,含充填岩体破坏损伤度明显小于无充填岩体,充填物不仅影响前期强度还影响峰后残余强度的提高,其充填试件峰后应变增幅达到18.75%;3)不同的充填物对岩体抵抗开裂的能力不同,水泥浆的黏结力和强度比石膏好,故水泥浆具有良好的加固效果.试验探讨了非直裂隙(“S冶型)及充填材料对裂隙岩体破坏的影响,总结了充填材料作用下裂隙的扩展模式,为实际工程裂隙化岩体提供实验依据和参考.

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