放顶煤煤体破碎度实验研究

实验研究支承压力(采深)、煤体强度和裂隙发育程度对煤体破碎块度分布的影响变化规律。根据顶煤回收要求与可放块度原则得出预测临界采深的实用关系式，并以加权平均块度评价支承压力、煤体强度和裂隙发育程度等3个因素对顶煤可放性分类的影响，提出顶煤可放性的三因素评价准则。

Experimental Research on the Broken Lumpiness of the Top Coal

This paper introduces the experimental research on the varying regulations of the influence of the supporting compression (mining depth), coal body strength, and the developing extent of the fractures, etc. on the distribution of the broken lumpiness, gives the operational relation for forecasting the critical mining depth based on the requirement for the top coal recovery and the caveable lumpiness principle, and by using the weighted average of the coal lumpiness, evaluates the influence of the supporting compressure, coal body strength and the developing extent of the fractures on the classification of the top coal's caveability, and puts forward the three-factor evaluating principle of the top coal's caveability.