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.

In order to solve the above problems, a study on the DC-DC power modular of the loading terminal was conducted and a new design plan of the intrinsic safe DC-DC isolated power modular was provided.

When the mine intrinsic safe power was energized, due to the loading, the mine intrinsic power would have miss actions and poor reliability occurred by the capacitor charging.