Roadway shell-arch combined powerful bearing structure and construction method thereof

Abstract

The invention discloses a roadway shell-arch combined powerful bearing structure, including a roadway, the section of the upper roadway part is a semicircular arch or an arc arch. Surrounding rocks outside the roadway are surrounding rocks within the range of a loose circle and surrounding rocks within the range of 1 m outside the loose circle in sequence from inside to outside, a supporting shellis arranged on the inner wall of the surrounding rocks within the range of the loose circle, and a supporting arch is arranged inside the surrounding rocks within the range of the loose circle and the surrounding rocks within the range of 1 m outside the loose circle. The invention further discloses a construction method of the roadway shell-arch combined powerful bearing structure. The strengthloss of the surrounding rocks in the loose circle is effectively prevented, a strong anchoring bearing structure is formed within the range of 1 m outside the loose circle, the stability of the surrounding rocks of the roadway is remarkably improved, and the loose circle is effectively prevented from expanding to a deep part. Cracking and damage of a concrete spraying layer are effectively avoided, and long-term stability of the surrounding rocks of the roadway is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of roadway surrounding rock control in mining engineering, and in particular relates to a roadway shell-arch composite strong bearing structure and a construction method thereof. Background technique [0002] With the development of coal mine roadway support technology, bolt support, anchor cable support and grouting reinforcement technology have become economical and effective support forms for coal mine roadway. Under the condition of deep high stress and complex mining stress, in recent years, the support technology of high-strength bolt and high pre-tightening force has been popularized and developed, and good support effect has been achieved in field application, but under the condition of weak surrounding rock, there are still The roadway instability phenomena such as large-area sprayed layer cracking, supporting structure breaking and tearing, and continuous rheology of surrounding rocks have been fou...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the deficiencies in the prior art, the present invention provides a roadway shell-arch composite strong bearing structure and its construction method, aiming at forming a "tough and tough concrete shell" and a "high-strength anchored load-bearing arch" for the arched roadway through support. ", the combination of the two forms a "shell-arch combined strong bearing structure", which effectively solves the technical problems existing in the prior art such as "cracking of the concrete shotcrete, failure of the anchor bearing structure, and difficulty in controlling the deformation of the roadway"

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