Hooping housing charging-type flexible yield lining and constructing method for tunnel supporting

Abstract

The invention discloses a hooping housing charging-type flexible yield lining and constructing method for tunnel supporting. The method comprises multiple hooping housing charging bodies which are arranged in the circumferential direction of a tunnel, and yield hooping housing charging bodies are connected between the hooping housing charging bodies; after the hooping housing charging bodies are connected with the yield hooping housing charging bodies, pressure buffering layers are arranged between the outer circumferences of the hooping housing charging bodies and the surface of the wall rockof the tunnel; the hooping housing charging bodies comprise hooping housings, and the interiors of the hooping housings are fillers I; the yield hooping housing comprise corrugated hooping housings,and the interiors of the corrugated hooping housings are fillers II; prestress anchoring bolts vertically penetrates through the outer circumferences of the hooping housings and the inner ring surfaces; prestress is exerted by the prestress anchoring bolts so that longitudinal squeezing can be generated on the hooping housings and the internal fillers I, and therefore a composite bearing structureis cooperatively formed by the prestress anchoring bolts, the hooping housings and the fillers I. When the external wall rock pressure of the tunnel exceeds a certain value, the pressure buffering layers can generate squeezing deformation to allow the yield hooping housing fillers to be retracted inwards in the circumferential direction, and the flexible yield of the whole lining is achieved.

Description

technical field [0001] The invention relates to the technical field of roadway support, in particular to a shell-filled flexible yielding lining for roadway support and an application method. Background technique [0002] Coal is the main energy source for the rapid development of my country's national economy. According to statistics, the amount of coal resources buried deeper than 1000m in my country is 2.64 trillion tons, accounting for about 47.4% of the total coal resources in my country. With the depletion of shallow coal resources, it has become an inevitable trend for coal mining to gradually shift to deep. Under the influence of "high ground stress, high ground temperature, high seepage water pressure and strong mining disturbance" in the deep part, the deep rock mass will show significantly different failure characteristics from the shallow rock mass. The large deformation, strong rheology, and frequent occurrence of roof fall disasters in the surrounding rock of...

AI Technical Summary

Problems solved by technology

[0003] In view of the low elongation rate, inability to adapt to large deformation of surrounding rock, uneven pressure of surrounding rock in support system and barrel effect in traditional support technologies such as bolts, anchor cables, U-shaped steel arches and shotcrete in deep roadways Obviously, it is difficult to complete the construction immediately, resulting in untimely and excessive damage to the surrounding rock support, cumbersome construction process, easy cracking, damage, and poor anchor spraying operation environment. The present invention proposes a hoop for roadway support. The shell-filled flexible yielding lining and its construction method can realize the flexible yielding of the support structure itself, release the internal strain energy of the surrounding rock in time, and ensure a more uniform circumferential pressure on the surrounding rock, and the supporting strength of this lining High, it can provide high support resistance to the surrounding rock; at the same time, this kind of yield lining is a prefabricated assembly structure, which only needs to be assembled on site, which can effectively improve the construction progress of roadway excavation and the quality of support construction, and reduce the cost of support. The labor intensity of nursing operations can also be improved to improve the on-site operating environment

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