The polypropylene fibre concrete is the new kind of concrete flexible shotcrete layer forms in the soft rock tunnel supporting engineering.
聚丙烯纤维混凝土柔性喷层是软岩巷道支护中一种新型的喷层形式。
Based on practice of excavating piles, the reasons conditions and preventive measures about damage by blasting on supporting rocky layer, pillar ground support and concrete in pile have been proposed.
依据大量掘桩实践，论述了掘桩爆破对持力岩层、护壁、桩间岩柱、邻桩支护和新浇砼损伤的原因、条件和防范措施。
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