基于膨胀崩解试验的泥岩水理特性研究

Study on hydraulic characteristics of mudstone based on expansion disintegration test

本文以渠道开挖工程泥岩为研究对象,对该泥岩的物理性质、侧向约束及压力膨胀性、耐崩解性进行试验研究,分析了不同吸水率与岩石侧向约束轴向膨胀率的关系曲线,探讨了该类泥岩遇水崩解特性。研究表明:该类泥岩离散性较大,侧向约束膨胀率为0.307%~0.8167%,膨胀压力为19.59~31.07kPa,泥岩侧向约束轴向膨胀率、膨胀力随吸水率呈先增加后稳定的趋势,遇水易膨胀,在施工过程中容易引起失稳和破坏,并直接影响工程的稳定性,在工程施工设计中应采取合理的措施消除或减弱岩石膨胀及崩解对渠道工程的影响。

The mudstone of channel excavation projects is adopted as the research object.The physical properties,lateral constraint,pressure dilatability and disintegration resistance of the mudstone are studied experimentally.The relationship curves of different water absorption rates and rock lateral constraint axial expansion rates are analyzed,and the disintegration characteristics of the mudstone are discussed.The study shows that the mudstone has higher discreteness,the lateral restraint expansion rate is 0.307%~0.8167%,the expansion pressure is 19.59~31.07kPa,the mudstone lateral restraint axial expansion ratio and expansive force are increased and then stabilized with water absorption rate.It is expanded easily in water,which can cause instability and failure easily during construction,thereby affecting the project stability directly.Reasonable measures should be adopted in project construction and design to eliminate or weaken the influence of rock expansion and disintegration on channel project.