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钻孔水力压裂法是一种测量岩体天然应力的新方法。其法是在钻孔所需测定应力的深度的试段中,用上、下两个能承受高压的橡皮栓塞堵塞该试段,然后用高压水泵向试段内泵入高压水流。当压力升高到某一临界值(即压裂压力P_σ)时,试段孔壁岩体就被胀裂,并产生一些拉断裂隙。这种拉断裂隙是沿着阻力最小方向发生和发展的,当试段孔壁被压裂,出现拉断裂隙时,停止泵入高压水流,这时,试段中拉断裂隙面上作用的压力与高压泵的压力保持一个闭合回路,这时
Drilling hydraulic fracturing is a new method of measuring the natural stress of rock mass. The method is to test the depth of the drill hole in the test section, with the upper and lower rubber plugs can withstand high pressure block the test section, and then use a high-pressure pump to pump high-pressure water into the test section. When the pressure rises to a certain critical value (ie, fracturing pressure P_σ), the rock mass in the borehole wall of the test section is burst and some pull failure gaps are generated. This kind of tensile failure occurs and develops along the minimum direction of resistance. When the wall of the test section is fractured and a rupture gap occurs, the high pressure water flow is stopped. At this time, the role of the tensile failure surface in the test section The pressure and the pressure of the high pressure pump maintain a closed circuit.