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利用3D打印技术制作平行、合并、T型、斜交以及正交裂隙,通过模具浇筑成贯通充填裂隙类岩石试样,应用低渗透岩石惰性气体渗透测试系统测试不同围压加卸载条件下贯通充填裂隙类岩石渗流特性,研究具有不同渗透结构面试样在不同围压作用下气体渗透率的变化规律。通过试验研究发现:充填物相同情况下,开度相同,形式不同的渗透结构面试样渗透率不同,但数量级上不存在差异,以围压加载25 MPa为例,平行裂隙试样渗透率最大,合并裂隙试样渗透率最小;试样渗透率随围压变化曲线在围压加载阶段高于卸载阶段,不同渗透结构面试样渗透率随围压变化波动幅度不同;围压加载阶段贯通充填裂隙类岩石渗透率与围压关系符合多项式函数;不同试样渗透率对应力敏感系数随围压变化曲线在围压加载阶段变化趋势不尽相同,在围压卸载阶段各曲线变化趋于接近,呈“W”型,贯通充填裂隙类岩石渗透率对应力敏感性受渗透结构面影响。
The parallel, merged, T-shaped, skewed and orthogonal fractures were fabricated by using 3D printing technology. Through the mold pouring into the perforated crack-like rock samples, the low permeability rock inert gas permeation testing system was used to test the through-fill The seepage characteristics of fissured rocks are studied. The variation of gas permeability under different confining pressures is studied. The experimental results show that the infiltration rate of infiltrated structural specimens with the same opening and different forms is different under the same filling conditions, but there is no difference in the order of magnitude. For the 25 MPa confining pressure loading, the permeability of the parallel fractured specimen is the largest , The permeability of the specimen with the combined fissure is the smallest; the permeability of the specimen changes with the confining pressure during the period of the confining pressure is higher than that of the unloading stage, the permeation rate of the different infiltration structure varies with the variation of the confining pressure; The relationship between permeability and confining pressure of fractured rocks accorded with polynomial function. The trend of stress sensitivity coefficient with confining pressure changed with the confining pressure during the confining pressure loading stage. The curves of different curves tended to be close to each other during the process of confining pressure unloading, Was “W ” type, penetration through fissure type rock permeability on the stress sensitivity affected by the infiltration structure.