基于大刚度支护体系的新型暗挖技术

A new underground excavation method based on large rigidity support system

传统暗挖技术存在施工风险大、施工效率低、对周边环境影响大、工程投资大等问题,很难适用于软弱地层或复杂环境下大型地下结构暗挖施工。为解决以上问题,提出一种基于大刚度支护体系的新型暗挖技术。新型暗挖技术利用纵向管幕、顶横梁和中间立柱构筑大刚度支护体系,支护体系各构件通过非开挖方式或者在管幕保护下利用小空间构筑,保证施工安全的同时,防止地层出现较大应力释放,支护体系构筑完成后即可进行大面积暗挖施工。新型暗挖技术工序简单、施工效率高、风险低、对周边环境影响小、工程投资小。数值分析和工程实例验证了新型暗挖技术的可行性和实用性,新技术为大型地下结构暗挖技术提供了新的思路。

The traditional underground excavation method has problems such as high risk,low efficiency,great impact on the surrounding environments and large investment.It is difficult to construct large underground structures in soft strata or complex environments.In order to solve these problems,a new underground excavation method based on the large rigidity support system is proposed.The pipe roof,horizontal beam and vertical column are used to construct a large rigidity support system,and each component is constructed by using the non-excavation method or constructed in a small space under the protection of pipe roof,which ensures the construction safety and prevents the stress release of the stratum.After the support system is constructed,bulk excavation can be carried out.The new underground excavation method has the advantages of simple process,high efficiency,low risk,small impact on the surrounding environments and small investment.Numerical analysis and engineering examples verify the feasibility and practicability of the new method,which provides a new idea for the construction of large underground structures.