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1·The soil ESP influence on soil internal frictional angle is small.

但土壤碱度对土壤内摩擦角的影响较小。

2·In this Paper the joint profile expression and fractal theory are reviewed, and the fractal theory is used to study the frictional Angle of the rock joint.

本文首先简要介绍节理形貌的描述方法和分形几何理论，然后将分形理论引人岩体节理摩擦角的研究中，得出了用分形维数表示摩擦角的经验公式。

3·Discrete element method is used to analyze the roof stability in accordance with the variation of its loading, rock frictional Angle, bolt spacing, rock properties and bolt orientation.

采用离散单元法，分析了当荷载、岩体的摩擦角、锚杆间距、锚杆方向和岩体的性质变化时，顶板的稳定性。

4·The results of laboratory tests show as follows:The frictional resistance between angle steel and concrete is primarily acting on the front end under the same small load;

试验结果表明：在较小的同一荷栽作用下，角钢与混凝土间的摩擦力主要是由前端部分承受；