Constant-resistance large deformation anchor cable control method for soft rock tunnel surrounding rock large deformation disaster

Abstract

The invention provides a constant-resistance large deformation anchor cable control method for soft rock tunnel surrounding rock large deformation disaster. Guniting sealing is carried out on a fracture surface timely after tunneling, contact time of surrounding rock and air is shortened, a steel bar net is rapidly laid and a constant-resistance large deformation anchor cable is installed, and thesurrounding rock is reinforced through high prestress of the anchor cable. Huge plasticity energy in the surrounding rock can be released in a large deformation mode, firstly, the huge plasticity energy acts the constant-resistance large deformation anchor cable, after the surrounding rock plasticity energy is released, energy acting on a supporting body can reduce gradually, at the moment, the constant-resistance large deformation anchor cable supporting body can be located in a constant-resistance coupling supporting state, steel arch supporting is combined, the supporting effect of ''couple hardness with softness'' is formed, the stability of tunnel surrounding rock is guaranteed, and the soft rock tunnel surrounding rock large deformation disaster is avoided.

Description

technical field [0001] The invention belongs to the technical field of support for surrounding rock deformation of soft rock tunnels, and in particular relates to a constant resistance large deformation anchor cable control method for large deformation disasters in surrounding rocks of soft rock tunnels. Background technique [0002] Since the first severe large deformation of weak surrounding rock in a traffic tunnel occurred in the early 20th century, there have been many cases of large deformation of surrounding rock in tunnel engineering at home and abroad, and it has always been a major problem in the underground engineering field. Abroad, such as Tauern Tunnel (Tauern) in Austria, Simplon Tunnel (Simplon) from Switzerland to Italy, Ena Mountain Tunnel in Japan, Arlberg Tunnel in Austria, etc., have all experienced serious large deformations. Domestically, such as the Jiazhuqing Tunnel of the Nankun Railway, the Muzha Tunnel of Taiwan, the Wushaoling Tunnel of the Lanwu...

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Problems solved by technology

Domestically, such as the Jiazhuqing Tunnel of the Nankun Railway, the Muzha Tunnel of Taiwan, the Wushaoling Tunnel of the Lanwu Line, the Guanjiao Tunnel of the Qinghai-Tibet Line, the Partridge Mountain Tunnel of the National Highway 317, the Muzhailing Tunnel of the Lanzhou-Chongqing Railway, and the currently under construction Wei The Muzhailing Highway Tunnel of Wuhan Expressway and other projects have experienced large deformations of weak surrounding rocks in different degrees and forms, which has brought great difficulties and safety risks to the construction of the project, and the increase in the repair rate has greatly increased the construction cost. and extended construction period

[0003] In order to effectively control the large deformation of the soft surrounding rock of the tunnel, scholars at home and abroad continue to study the large deformation of the tunnel surrounding rock, and the large deformation control technology of the tunnel surrounding rock has also been increasingly developed, but the control effect and cost investment have not yet reached the expected goal

At present, the magnitude of deformation of soft rock tunnel support under extremely high ground stress geological conditions has broken through the cognition level of theory and practice followed by tunnel and underground engineering circles at home and abroad, and there is no mature experience for reference in survey and design, so it is difficult to Predict the dynamic changes of the surrounding rock and control its development law, and cannot determine the reasonable parameters of the support at one time

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