Rock shear strength value c, which reflects stratum lithology is the most fundamental factor, and it is affected by other factors.

地层岩性的抗剪强度指标是最根本的因素，且受其它诸因素的影响。

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Study shows that: incised valley of the rock mass caused by unloading relaxation, caused by rainwater infiltration rock strength degradation is the formation of red layer a major factor in landslides.

研究表明：河谷下切引起的岩体卸荷松弛，雨水进渗导致的岩体强度衰减是导致红层滑坡形成的主要因素。

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Rock strength is related to drilling parameters and features of formation rock. Formation pore pressure is an important affecting factor on rock strength.

在石油钻井施工过程中，岩石的抗钻强度主要受井下地层岩石性质的影响，地层孔隙压力则是影响岩石抗钻强度的一个重要参数。

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