Stability Analysis of Rocks Around Buried Pipelines in Seasonal Permafrost Layers
As a big country of permafrost in the world,nearly half of China's land contains different kinds of permafrost,and the problems of permafrost and frozen rock are inevitable during the laying process of oil and gas pipelines,so it is very important to study the stability of the rocks around the buried pipelines.The modulus of elasticity is an important index for analyzing and evaluating the structural integrity and stability of rocks,and the macroscopic and microscopic composition,structure and distribution characteristics of the rocks around the buried pipelines have an important influence on the modulus of elasticity of the rocks,and there are certain deficiencies in the current research.A model for calculating the modulus of elasticity of rocks was developed based on the representative elementary volume method for porous media.Using the constructed model,simulations were carried out using the sandstone body structure as an example to analyze the characteristics of the influence of changes in porosity,water content,and channel composition coefficients on the elastic modulus of rocks.The results showed that the elastic modulus of the model tended to decrease with the increase of porosity;when the porosity was constant,the elastic modulus decreased with the increase of water content and decreased with the increase of channel composition factor.
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