基于颗粒流的裂隙砂岩腐蚀后裂纹扩展规律分析

Analysis of Crack Expansion Pattern after Corrosion of Fractured Sandstone Based on Particle Flow

基于颗粒流离散元法,对腐蚀后预制裂纹的砂岩进行双轴压缩试验,利用颗粒流PFC^(2D)模拟分析不同化学腐蚀后裂隙岩石的裂纹起裂、扩展和贯通破坏规律。研究结果表明:溶液腐蚀后裂隙砂岩在双轴加载下,加载的侧压不同其应力—应变曲线的变化特征随着侧压加载越大,峰值强度越高。不同化学溶液腐蚀作用下翼形裂纹萌生的角度发生不同程度的变化,翼形裂纹及剪切裂纹萌生的数量及角度会产生明显的变化,其中盐酸溶液对岩石造成损伤程度最大。综合考虑化学腐蚀和力学特性,可以建立裂隙岩石的数值模型,进一步分析其在不同环境下的行为。这对于理解岩石的稳定性和在地质工程方面的应用具有重要意义。

Biaxial compression tests based on particle flow discrete element method were conducted on sandstone with prefabricated cracks after corrosion to analyze the crack initiation,extension and penetration damage laws of fractured rocks af-ter different chemical corrosion,and the experimental phenomena were analyzed using particle flow PFC^(2D) simulations to ex-plain.The results show that:the change characteristics of the stress-strain curve of the fractured sandstone after solution corro-sion under biaxial loading with different loaded side pressures with the higher side pressure loading,the higher the peak strength.The angle of wing-shaped cracks sprouting under different chemical solution corrosion changes to different degrees,and the number and angle of wing-shaped cracks and shear cracks sprouting will produce obvious changes,among which hydro-chloric acid solution causes the greatest degree of damage to the rock.Considering chemical corrosion and mechanical proper-ties together,a numerical model of the fractured rock can be established to further analyze its behavior under different environ-ments.This is important for understanding the stability of rocks and for applications in geoengineering.