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以内含空腔的围岩为研究对象,考虑围岩中裂隙度、孔隙度和渗透率等主要因素的影响,忽略次要因素的影响,进行了气体渗流问题的理论研究。基于达西定律,经分析推导,得到了计算内含空腔围岩中气体渗流问题中气体渗透量和气体渗流到达时间等重要参数的解析公式。开展了花岗岩气体渗流试验,将TNT炸药置于花岗岩内部空腔中引爆,以气体产物CO作为示踪气体,测量了其在围岩中的渗透量和渗流到达时间。使用推导的解析公式对试验进行了计算,计算结果表明,解析公式能够快速而准确地计算从内部空腔渗流到围岩介质中的气体体积和气体渗流到达时间。使用推导的解析计算公式估算围岩中气体渗流问题,计算方便快捷,对于实际工程遇到应急问题时,具有较好的实用性。同时,基于理论分析得到的解析计算公式,可以为数值模拟结果的验证和试验研究的设计提供有益的参考。
Taking the surrounding rock with cavities as the research object, considering the influence of the main factors such as the fracture degree, porosity and permeability in the surrounding rock, ignoring the influence of the secondary factors, the theoretical study of the gas seepage problem is carried out. Based on Darcy’s law, the analytic formulas of important parameters such as gas permeation and gas seepage arrival time in gas seepage problem with cavity surrounding cavity are obtained after analysis and derivation. Granite gas seepage test was carried out. Detonation of TNT explosive was placed in the hollow cavity of granite. The gas product CO was used as the tracer gas to measure the seepage volume and seepage time in surrounding rock. The experimental results were calculated using the derived analytical formulas. The calculated results show that the analytical formula can quickly and accurately calculate the gas volume and gas seepage time from the internal cavity to surrounding rock. It is convenient and quick to calculate the gas seepage problem in the surrounding rock by using the derivation analytical formula and has good practicability when the actual project encounters the emergency problem. At the same time, based on the analytic calculation formula obtained by theoretical analysis, it can provide useful reference for the verification of numerical simulation results and the design of experimental research.