摘要
为了获得煤岩非Darcy流渗透特性,利用MTS-02型岩石力学试验系统采用全程位移控制对煤与瓦斯突出矿煤样进行了全应力应变过程数控瞬态渗透法试验。计算出煤样破坏过程中不同应变下非Darcy流渗透率、非Darcy流β因子、加速度系数及渗流稳定性指数,并给出发生渗流失稳所需的压力梯度。研究表明:该突出矿煤样的渗流稳定性指数χ的负值较多出现在峰值应力后并且其发生渗流失稳所需的压力梯度较大。
Coal samples are collected from a coal- and gas-burst mine in order to investigate the seepage properties of non-Darcy flow in such coal and rock. Tests on coal samples under complete stress-strain process and full-process displacement control are conducted by using the MTS-02 rock mechanics testing system and the numerically controlled transient permeability method. The non-Darcy flow permeability, the non-Darcy flow factor 13, the acceleration coefficient and the seepage stability index of the coal samples under different strains during failure process are obtained. Also, the pressure gradient for seepage instability occurrence is given. It shows that the negative values of seepage stability index mostly occur after the peak stress and when the required pressure gradient for seepage instability is high.
出处
《辽宁工程技术大学学报（自然科学版）》
CAS
北大核心
2010年第1期91-94,共4页
Journal of Liaoning Technical University (Natural Science)
基金
国家自然科学基金资助项目(50874089)
国家自然科学基金重点基金资助项目(50534049)
国家重大基础研究发展计划基金资助项目(2005CB221500)
