The testing results are listed, and the obtained parameters can be widely used in hydraulic fracturing optimization design of coal bed, calculation of in situ stress and other engineering problems.

研究范围覆盖面广，所得到的力学参数有一定代表性，可广泛应用在煤层裂缝优化设计、地应力计算以及解决其它工程问题。

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The experiments indicate that the control parameters of crack development induced by hydraulic fracturing have practical meaning for improving the effect of prefracturing design for hard top coal.

试验表明，本文结果中水压裂缝扩展控制参数对改善顶煤预裂设计效果具有实际意义。

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The system was successfully applied to guide the design of the site hydraulic fracturing operation for the coal bed methane well in Panzhuang Block of Qinshui Basin.

这一系统成功地应用于指导沁水盆地潘庄区块煤层气垂直井的现场水力压裂施工设计。

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