Its key is to eliminate unlimited blocks and movable blocks, find out and study the key block at free face, and propose rational reinforcement measures for potential instable blocks.
其核心可归结为排除无限块体和不可动块体找出临空面上的关键块体，对其进行分析研究并对可能失稳的块体提出合理的加固措施。
The more suitable excavation construction methods and auxiliary measures such as big steel pipes, face grouting reinforcement and compensation grouting are selected by various comparison analyses.
对主要施工方案进行优化，并选取超前大管幕、掌子面注浆、补偿注浆等辅助措施；
The more suitable excavation construction methods and auxiliary measures such as big steel pipes, face grouting reinforcement and compensation grouting are selected by various comparison analyses.
对主要施工方案进行优化，并选取超前大管幕、掌子面注浆、补偿注浆等辅助措施；
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