Breakwaters have been built throughout the centuries for the coastal protection and the port development, but changes oc......

为了实施投球调剖技术,考察了不同力学性能的园形球单向封闭注水井炮眼的机理,选用了可靠贴炮眼口的硬质实心塑料球.提出了对塑料......

论述了冻结壁解冻技术在葫芦素矿井风井井筒的具体应用,首次采用了在冻结管内循环注入热水进行强制解冻,然后进行射孔注浆施工作业......