通过X射线粉晶衍射成分分析，结合岩石点荷载强度试验研究，查明国内外首次发现的此隧道部分砂质泥岩发生岩爆活动的内在原因。
Through the X-ray diffraction analysis and point loading strength test, intrinsic causes for the rockburst in some sandy mudstones in Erlang mountain highway tunnel has been ascertained.
关于点荷载强度试验的经验公式及其修正指数的规定和论述，在相关的规范和手册中还有一些有待明确的方面，因此在岩土工程应用中存在着一定的局限性。
Concerning the stipulation and statement for empirical formula and revised index in point loading strength test there are still some uncertainties in related specifications and manuals.
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