Yielding anchor rod suitable for soft rock large-deformation underground space and support method

Abstract

The invention discloses a yielding anchor rod suitable for a soft rock large-deformation underground space and a support method. The yielding anchor rod comprises an anchor rod body, a resin anchoringagent, a yielding resistor, a W-shaped steel belt, a cushion plate, a spherical nut, a hexagonal nut and an anchor rod pretensioner, wherein the resin anchoring agent is placed at the front end of the anchor rod body; and the yielding resistor, the W-shaped steel belt, the cushion plate, the spherical nut, the hexagonal nut and the anchor rod pretensioner are arranged at the tail end of the anchor rod body in sequence. Compared with the prior art, the yielding anchor rod has the beneficial effects that the resin anchoring agent can provide sufficient anchor force, so that more timely preliminary bracing is achieved, and the possibility of surrounding rock large deformation is lowered. The yielding structure of the anchor rod is used with the W-shaped steel belt in a matching way, so thatthe support effect of the anchor rod on the soft surrounding rock is improved, and the large deformation of the surrounding rock is reduced.

Description

technical field [0001] The invention relates to a pressure-yielding bolt and a supporting method suitable for large-deformation underground spaces of soft rock. Background technique [0002] With the rapid development of my country's railway, highway tunnel engineering and underground engineering, the number of tunnels built in super-long mountains is also increasing, and the absolute buried depth of tunnels is also increasing, often needing to pass through weak surrounding rock areas. However, the weak surrounding rock has the characteristics of high stress, complex geological structure, complex constitutive relationship, and expansibility, so that the support effect of the existing support technology on this weak surrounding rock is not good. There are following three problems in existing support technology: [0003] ⑴Because the surrounding rock is relatively broken or soft, ordinary mechanical anchoring heads cannot provide sufficient anchoring force. [0004] ⑵In the ...

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Problems solved by technology

[0003] ⑴Because the surrounding rock is relatively broken or soft, ordinary mechanical anchoring heads cannot provide sufficient anchoring force

[0004] ⑵In the bolt-spray joint support, ordinary bolts are not flexible enough, and can only provide rigid support for soft rock, without the function of yielding pressure, resulting in excessive support pressure, the bolt is broken and damaged, and loses its support function

[0006] ⑷The bolt support is a hidden support. Since the force measuring device is not installed, it is impossible to monitor the change of the support force during the bolt support process, and it is impossible to analyze and compare the data, and it is impossible to know the effect of the bolt support. Bad

[0007] (5) The steel arch frame is in direct contact with the surrounding rock, and there is no pressure space between the rigid support and the deformed surrounding rock. When the surrounding rock deforms in the early stage, the large surrounding rock stress will Direct damage to the steel arch frame, removal of arches and replacement of arches will greatly increase the cost and time spent on treatment, and in severe cases will cause equipment damage and casualties

[0008] These problems have directly affected the quality of tunnel support, and further affected the overall quality, progress and construction cost of the project.

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