Tunnel combined support system under strong to extremely-strong rock burst conditions and construction method
A combined support and tunnel technology, applied in tunnels, tunnel linings, underground chambers, etc., can solve the problems of unsuitable surrounding rock support, difficult to resist rock burst impact, etc., achieve good confining pressure level and strength, reduce personnel and equipment threats, the effect of ensuring the carrying capacity
Pending Publication Date: 2019-08-16
POWERCHINA HUADONG ENG COPORATION LTD
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Problems solved by technology
However, this concept has been proved to be unsuitable for surrounding rock support under rockburst conditions, especially for support under strong to extremely strong rockburst conditions. It is difficult to resist rockburst impact simply by strengthening the support, and it is necessary to establish a new support structure system
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[0023] Referring to the accompanying drawings, when tunnel 100 is excavated, when there is a risk of strong to extremely strong rockburst ahead, strictly control the excavation footage and the depth of the blast hole. The strong rockburst is controlled within 2m, and the extremely strong rockburst is controlled within 1m. And take a glossy blast.
[0024] When the tunnel passes through the strong to extremely strong rock section, it is necessary to carry out the construction of the supporting system in time.
[0025] (1) Construction of water-expandable bolts is carried out first
[0026] The water-expandable bolts 1 are generally arranged at a distance of 1m in a quincunx arrangement. The bolts are randomly arranged on relatively intact rocks. The size of the backing plate 10 of the water-expandable anchor rod is not less than 15×15cm.
[0027] The length of the water-expandable anchor 1 is required to pass through the blasting loose circle, but it should not be less than ...
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The invention provides a tunnel combined support system under strong to extremely-strong rock burst conditions and a construction method. The support system is composed of anchor bolt support, surfacesupport and rigid support, wherein the anchor bolt support adopts water swelling type anchor bolts and full-length bonded mortar anchor bolts which are matched; and the rigid support adopts steel arch ribs, the rigid support is embedded in the surface support, and the steel arch ribs are connected to the anchor bolt support. According to the tunnel combined support system under the strong to extremely-strong rock burst conditions and the construction method, a complete support system with a strong and soft combination and an exterior and interior combination is formed, the carrying capacity of the system is ensured, certain flexibility is achieved, deformation of surrounding rock caused by rock burst impact can be effectively adapted, and the confining pressure level and strength of the surrounding rock are well maintained; and meanwhile, the surface support and the deep support are combined organically, so that two functions of preventing the rock burst impact and suppressing age cracking are achieved at the same time. The support system is easy to implement on site, can be quickly installed to provide protection and greatly reduces threats of rock burst to personnel and equipment.
Description
technical field [0001] The invention relates to deep-buried tunnels in the fields of water conservancy and hydropower, transportation, mines, etc., especially a combined support system and construction method for hard rock tunnels that are prone to rock bursts under high ground stress conditions. Background technique [0002] Rockburst is a kind of engineering geological disaster induced by human activities in the underground engineering of high stress and brittle rock mass. It is a dynamic force caused by the sudden release of elastic strain energy stored in the rock mass without control. Instability is often accompanied by ejection, throwing, sounding and vibration of rock blocks (pieces). Rockburst not only directly threatens the safety of operators and construction equipment, but also seriously affects the construction progress and increases the project cost. [0003] High stress is unavoidable in deep underground engineering practice. Most of the rock masses in deep u...
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Patent Timeline
Login to View More IPC IPC(8): E21D11/00E21D11/10E21D11/15E21D11/18E21D20/00
CPCE21D11/006E21D20/00E21D11/18E21D11/152E21D11/10
Inventor 刘宁陈祥荣单治钢褚卫江张洋
Owner POWERCHINA HUADONG ENG COPORATION LTD