...：煤层顶板；岩石力学性质；沉积岩体结构；地质力学模型；顶板稳定性 [gap=2384]Keywords：coal roof;rock mechanical property;sedimentary rock mass structure;geological and mechanical model; roof stability..
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Joints which randomly distributed in rock mass is the main factor affecting the rock mechanical property.
岩体中存在的大量随机分布的裂隙对岩体的工程性质及稳定性有着极其重要的影响。
Exact Prediction and calculation of mechanical property and drillability of rock can provide the necessary base for the optimization of bits and designing parameters, thereby quickening penetration.
准确预测和计算岩石的力学性质和可钻性是有针对性地优选钻头、优化设计参数，从而提高钻井速度的重要依据。
Because rock mass possesses heterogeneity, discontinuity and rheology property, there exists some problems on the choice of rock mass mechanical parameter of layer rock mass slope engineering.
由于岩体具有不均匀性、不连续性和随时间变化的特性，目前在层状岩体边坡工程的岩体力学参数选取方面仍然存在一些问题。
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