膏溶角砾岩不同天然含水率情况下力学特性的试验研究

Mechanical properties of Gypsum Breccia with different water contents

针对天然含水率不同的膏溶角砾岩,采用RMT-150B型岩石电液伺服试验机,进行了烘干和天然情况下力学性能的试验研究。比较分析了烘干和天然条件下含水率对岩石应力应变曲线、峰值强度、弹性模量和泊松比变化情况。研究表明:含水率的不同对岩石的峰值强度、弹性模量和泊松比等力学性质有显著影响,随着含水率的增加,膏溶角砾岩的峰值强度和弹性模量呈指数减少,而泊松比呈线性增大。烘干后,岩石的力学性质发生了很大的变化,峰值强度、弹性模量都有很大的提高,岩石表现出脆性,岩石的天然含水率对烘干后的力学性质改变影响很大。

With regard to different natural water contents, the experimental research on the mechanical properties of Gypsum Breccia in natural and dried situations was conducted by use of the rock mechanics rigidity servo testing system （RMT-105B）. The mechanical properties included the stress-strain curve, peak stress, Young＇s modulus and poisson ratio of Gypsum Breccia. It was shown that the water content obviously affect the mechanical properties of Gypsum Breccia. The peak stress and Young＇s modulus decreased exponentially, while the poisson ratio increased linearly with the increase of the water content in the natural situation. The variation of the mechanical properties, including peak stress, Young＇s modulus and poisson ratio of Gypsum Breccia, was obvious. The peak stress and Young＇s modulus were improved after drying. The mechanical properties were obviously affected by the natural water content.