水热交替对红层泥岩崩解的影响

摘要

Based on previous studies, rock thermal physic and wicking action theories are used to examine the effect of the alternative change of heat and water on the slaking of redbeds, especially the rock structure before they are impacted by water and the alternative change of heat and water to the slaking. The results suggest that the alternative change of water and heat is the engine to the mudstone slaking. During the alternation, the fissures are built and the rock structure is created for the water permeation by the thermal stress within 0. 3 ~ 0.4 m of mudstone from the surface. The effective slaking depth is about 20 ~ 30 cm/a and the slaking process can be separated into five parts: excavation, thermal effect, water action, wetting and drying cycle ( time effect) and peeling off. The slaking phenomenon is caused by the coactions of water, heat and force.%在既有研究基础上,应用岩石热物理学、毛细作用原理重点探讨了温度、水等因素的湿热交替效应对红层泥岩崩解过程的影响,尤其是水侵入前红层泥岩的结构状态以及水热交替等因素对红层泥岩崩解的促进作用.研究表明:在周期性热应力的影响下,在红层泥岩表层0.3 ～0.4m深度以上产生较大热应力,导致岩体内部裂隙发育,为水的侵入创造了结构条件；水热交替是导致红层泥岩产生迅速崩解的主要动力；红层泥岩有效崩解深度为20～30cm/a;红层泥岩的崩解过程可以分为开挖揭露、温度效应、水的作用、干湿循环(时间效应)、剥落作用五个阶段,是水、热、力等因素综合作用的结果.