同时，根据卸荷岩体特性对地应力测试中应力解除过程进行分析，确定扩容对地应力测试的影响。

Besides, stress relief process of measurement is analyzed based on unloading rock mass properties; and the effect of expansion on stress measurement is determined.

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HRM - 45dt型电动表面洛氏硬度计是一种通过电动加载、保荷卸荷的半自动测试金属材料表面硬度的洛氏硬度计。

HRM-45DT motorized Superficial Rockwell Hardness Tester adopts motorized testing method. Its testing force can be loaded, kept and unloaded automatically. Avoid man-made error and easy to use.

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