高压水及负压加载状态下三轴应力渗流试验装置的研制

针对目前相关的三轴渗流试验装置缺乏高压水及负压加载功能而不能对高压水及负压加载状态下煤样瓦斯渗流规律进行研究这一问题,研制出了煤样试件出口负压可调并可对其进行高压水加载的新型三轴应力渗流试验装置。该装置主要由三轴应力加载系统、气体渗透系统、水力压裂控制系统、气体流量测试系统、传感与控制系统5部分组成,能够进行高压水及负压载荷下的各种单轴与三轴渗流试验。研究表明,该装置能够模拟抽采钻孔负压状态下煤体内的瓦斯运移规律及考察高压水对煤体的压裂效果,在实验室能完成对煤体试样负压状态下的渗流规律研究以及试件采取水力压裂措施后的增透效果考察。

Research on triaxial stress seepage experiment device loaded by high pressure water and negative pressure

In light of the problem that the related triaxial stress seepage experiment devices lack of high pressure water and negative pressure loading function at present, the gas seepage law of coal samples cannot be studied under both of these cases. A kind of new triaxial stress seepage experiment device has been developed, of which the export negative pressure of coal sample itself is adjustable and the high pressure water can be loaded to the coal sample. The device is mainly composed of five parts including triaxial stress loading system, gas seepage system, hydraulic fracturing control system, gas flow test system, sensing and control system, all sorts of uniaxial and triaxial seepage experiments can be carried out in the case that samples are loaded by high pressure water or the negative pressure. Studies have shown that the device can simulate the gas migration law about coal body when the pressure of extraction drill hole is negative and can investigate the hydraulic fracturing effect of coal, complete the research about gas seepage law of coal sample under negative pressure condition, at the same time accomplish the inspection about the anti-reflection effect of coal body after hydraulic fracturing measures implemented in the laboratory.