"We know we live on a rock, but the poor people of Ascension live on a cinder," the residents of St Helena had joked before his departure.
“我们知道我们生活在岩石上,但阿森松岛可怜的人们是生活在火山灰渣上,”圣赫勒拿岛的居民在他离开之前曾开玩笑说。
Xuehu coal main and subsidiary well have deep shaft, thick surface soil and strong disability, poor pourability in the hydrated grope rock and complex geology condition.
薛湖煤矿主、副井井筒井深、表土厚且膨胀性强、基岩含水层可注性差、地质条件复杂。
Because of the poor strength and the typical creep character of the soft rock, it is difficult to excavate and support the underground excavation.
软岩强度低,且具有明显的蠕变特性,常给地下巷道的开挖和支护带来很大的困难。
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