贯通充填裂隙类岩石渗流特性试验研究

发布时间：2018-05-14 03:24

本文选题：气体渗透率 + 围压加卸载　；参考：《岩土工程学报》2017年06期

【摘要】：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。
[Abstract]:Using 3D printing technology to make parallel, combined T-shaped, oblique and orthogonal fractures, and then pouring through and filling fissured rock samples through the mould, The seepage characteristics of fractured rock under different confining pressure loading and unloading conditions were tested by using the inert gas permeability test system of low permeability rock. The variation of gas permeability of interview samples with different permeability structures under different confining pressures was studied. The experimental results show that the permeability of the interview samples with the same opening and different forms is different under the same filling condition, but there is no difference in the order of magnitude. Taking the confining pressure loading for 25 MPa as an example, the permeability of the parallel fracture specimen is the largest. The permeability of combined fracture specimen is the smallest, the variation curve of sample permeability with confining pressure is higher than that of unloading stage at confining pressure loading stage, and the fluctuation range of permeability with confining pressure varies with different permeability structure interview sample. The relationship between permeability and confining pressure of fractured rock in confining pressure loading stage accords with polynomial function, and the variation trend of permeability sensitivity coefficient with confining pressure is different in confining pressure loading stage. At the stage of confining pressure unloading, the changes of the curves tend to be close, showing a "W" type. The permeability of the fractured rock is affected by the permeability structure plane.
【作者单位】：河海大学港口海岸与近海工程学院;河海大学岩土工程科学研究所;
【基金】：国家自然科学基金项目(11572110,51479049,51309243) 中央高校基本科研业务费专项资金项目(2016B05314)
【分类号】：TU458

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