The experiment results and reliability analysis stated: the short-time over - load would be make the strength reliability of open casting decrease seriously.

实验结果和可靠性分析表明：短时超载将导致开口铸件的强度可靠性严重下降。

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"The problems are caused by water, mining and a quarry, and there has also been open casting on the other time at one time... but none of these have been resolved by putting draining on the mountain, " he said.

BBC: Ystalyfera landslide