滕州地区砂质泥岩与砂岩物理力学性能对比分析

Comparative analysis of physical and mechanical properties of sandy mudstone and sandstone in Tengzhou area

为充分利用滕州墨子湖明挖隧道工程中的现有材料,保证工程质量并节约成本,针对当地普遍分布的砂质泥岩和砂岩开展了一系列物理与力学性能试验研究。从含水率、颗粒密度等物理指标对比分析了砂岩和砂质泥岩的物理特性,从单轴抗压强度、弹性模量等力学指标对比分析了砂岩和砂质泥岩的力学特性。试验结果表明:砂质泥岩的天然含水率、颗粒密度、孔隙率、单轴抗压强度与弹性模量均小于砂岩,而吸水率大于砂岩。砂质泥岩和砂岩的含水率与力学指标存在明显的相关性,两类岩样的单轴抗压强度、弹性模量均随含水率的增大而降低,砂岩比砂质泥岩更适合作为隧道回填材料。

In order to make full use of the existing materials in the open cut tunnel project of Mozi Lake in Tengzhou,to ensure the quality of the project and to save the cost,a series of physical and mechanical properties tests are carried out for the sandy mudstone andsandstone which are widely distributed in the area.Thephysical properties of sandstone and sandy mudstone arecompared and analyzed from the physical indexes suchas water content and particle density, and the mechanicalproperties of sandstone and sandy mudstone are comparedand analyzed from the mechanical indexes such asuniaxial compressive strength and elastic modulus.Thetest results show that:the natural water content, particledensity, porosity, uniaxial compressive strength andelastic modulus of sandy mudstone are lower than those ofsandstone, while the water absorption is higher than thatof sandstone.The water content of sandy mudstone andsandstone is obviously related to the mechanical index.The uniaxial compressive strength and elastic modulus ofthe two kinds of rock samples decrease with the increaseof water content.Sandstone is more suitable for tunnelbackfill than sandy mudstone.