煤层底板灰岩成分微结构特征分析及注浆加固性质评价

岩石遇水后其内部结构及物理力学参数会发生一定变化,这些变化与水理作用下组成岩石的成分及内部结构的变化是紧密相关的。华北石炭二叠型煤炭底板灰岩的一个显著受力特点是受矿山压力和高承压水双重作用。这种特殊的应力环境使得其强度和变形特征比一般岩石要复杂得多,主要表现在水理长期作用下岩石的矿物成分及与岩石微结构有关的孔隙、裂隙等物理参数发生了显著变化,这种变异最终影响了岩石的强度。基于此,借助现代先进分析测试仪器,通过实验室内成分鉴定和微结构分析,定性研究了水对这些性质的影响,在此基础上对其注浆加固性质和水理软化倾向进行了评价。研究本溪灰岩的成分及不同含水率时的微结构特征,对于合理解释其力学性能的变异及工程性质有重要指导价值。

Analysis on Micro-structural Characteristics for Limestone Components and the Evaluation of Grouting Reinforcement Properties

Its internal micro structural characteristics and the physical and mechanical parameters will change when rocks are subjected to water.These changes are mostly associated with the inner structures and components of rock mass.The floor limestone of North China permo-carboniferous type has a typical feature that it is under double action of mine pressure and high pressure water.In this case，under the special stress condition，the strength and deformation characteristics are more complex than the common rock.It shows that mineral compositions and micro structural characteristics，such as pore，fracture and other physical parameters，will change greatly under water immersion environment.Such differences will ultimately affect the strength of rock.Based on these，components identification and microstructure are analyzed by means of advanced instruments in the lab，and the effects of water on the properties are qualitatively analyzed.Meanwhile，grouting quality and water softening tendency are evaluated.The researches on ingredients and micro structure characteristics in different moisture content for Benxi limestone have important guiding value for a reasonable explanation of their mechanical properties and its engineering properties.