drilling

The paper summarized the development and research results of special drilling technique,the technical result transformation and examples of its application in many fields.

总结了特种钻凿技术的发展研究成果、特种钻凿技术成果的转化和多领域应用实例,对特种钻凿技术在资源、环境和工程建设中发展趋势与展望提出了的看

The large hole hard drilling is a technical difficult problem,though there are many researching thinking and methods from scientists and engineering technical personnel at home and abroad and achieved certain results.

大口径硬岩钻凿是一个技术难题，尽管国内外科学家和工程技术人员研究思路及方法较多，并取得了一定效果，但是，仍然存在着各种问题和不足。