大断面马头门支护施工技术

摘要

以具体工程为例，分析了软弱~半坚硬岩层中大断面马头门的围岩岩性，研究了大断面马头门支护的重难点，提出了采用锚网喷+锚索一次支护，钢筋混凝土砌碹二次支护的支护体系，并阐述了施工的注意事项，实践表明该支护体系取得了良好的施工效果。%Taking some projects as the example, the paper analyzes the surrounding rock properties of the large-section horse-head ingate of weak and half-hard rock stratum, researches the difficulties and main points for the large-section horse-head ingate support, points out the support sys-tem with bolt-mesh-spray + anchor cable first support and reinforced concrete masonry-lining second support, illustrates the precautions in the construction, and proves the support system achieves better construction effect.