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加强岩心特征的分析和研究,可以有效地帮助机场判断孔內情況,予防事故,提高鑽探質量。現将有关經驗介紹如下: 一、岩心傾角变比的反映。在鑽进过程中,岩心傾角是不断变化的。但造成岩心傾角变化的因素,不外两方面,一为鑽进方向的改变(方向和方位的变化),一为地下构造的变化。但一般鑽进方向的改变是漸变的,不会造成岩心傾角在短距离內发生突变,因此当岩心傾角在短距离內有突变現象时,一定为地下构造有变化所引起,或为已遇断层(如图1)或为通过背向斜軸部(如图2,鑽孔由翼部忽然穿过軸
Strengthening the analysis and research of the core characteristics can effectively help the airport determine the situation in the hole, prevent accidents and improve the quality of drilling. The relevant experience is as follows: First, the reflection ratio of core inclination. Core dip is constantly changing during drilling. However, the factors causing changes in core dip are, however, two aspects, one is the change in the direction of drilling (the change in direction and orientation) and the other is the change in subsurface structure. However, the change of general drilling direction is gradual and does not cause the core dip to change suddenly within a short distance. Therefore, when the core dip has a sudden change in a short distance, it must be caused by the change of subsurface structure, Fault (Figure 1) or through the back slant axis (Figure 2, drilling suddenly by the wings through the shaft