石质构件风化层内力学性能变化规律研究

石质构件风化层内力学参数随深度变化的规律是石质古建筑稳定性、耐久性和保护方案研究中重要的内容。本文针对古建筑石质构件风化层不便取样,风化岩样加工易破坏和室内试验只能得出试件整体的力学参数,不能反映风化层内力学参数由表及里逐渐变化的不足,综合运用现场声波测试和室内试验对义乌宋代古月桥(建于1213年)风化条石的抗压强度、弹性模量与深度的关系进行了研究。研究表明,风化层内岩石弹性模量、抗压强度与未风化区域的比值随深度呈较好的负指数关系。

FIELD AND LABORATORY MEASUREMENTS OF THE DEPTH VARIATIONS OF MECHANICAL PROPERTIES AND WEATHERING DEGREES OF ROCK STRUCTURAL COMPONENTS IN ANICENT BRIDGE

The mechanical behaviour and variations in weathered rock structural components is very important to the stability, durability and protection of ancient rock buildings and bridges. This paper studies the variations of the compressive strength and the elastic modulus with depth in weathered rock blocks. The weathered rock blocks are the rock structural components of the Ancient Moon Bridge. It uses the sound wave in-situ testing technique and the laboratory tests because of the facts that weathered rock sample is hard to get from the ancient bridge the weathered rock samples are easy to break during sampling, and that the laboratory test can only get the mechanical parameters of an entire rock sample and cannot finds the gradual variation of the mechanical parameters along the depth of the weathered rock zone. The results indicate that the compressive strength and the elastic modulus ratio are inverse functions of exponent with respect to the depth from the weathered rock surface to the un-weathered rock zone.