地应力是煤和瓦斯突出的主导因素的观点,已为国内外多数研究者所接受。地应力测量不但对煤和瓦斯突出机理,而且对于突出危险性预测及防止突出措施效果检验等均有重要意义,因而受到国内外学者的重视。 在各类测试方法和手段中,孔底应变法因在应力解除时具有钻取岩芯长度短的优点,而被选用为测量突出煤层围岩地应力的方法。但是这种方法需要用3个钻孔交汇,不但工程量大,并且其中任一钻孔不成功就会影响整个测量结果。因此,如果能用一个 The view that geostress is the dominant factor of coal and gas outburst has been accepted by most researchers at home and abroad. The measurement of geostress is of great importance not only for the mechanism of coal and gas outburst, but also for prominence of the risk prediction and inspection of the effectiveness of the prevention of outbursts. Therefore, it has attracted the attention of domestic and foreign scholars. In all kinds of testing methods and methods, the hole-bottom strain method was chosen as the method to measure the in-situ stress of the surrounding rock of the prominent coal seam because of the advantage of short drilling core length when the stress was relieved. However, this method requires the intersection of three drill holes, not only the large amount of work, but also the failure of any one of the holes will affect the whole measurement result. So, if you can use one