Construction technology for soft rock large-deformation tunnel by de-stressing method and matched bracket
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A construction technology and large deformation technology, applied in pillars/supports, tunnels, mining equipment, etc., can solve the problems of reduced section, reduced strength of surrounding rock, fracture of bolts and cables, etc., to achieve strong engineering practicability, Long service time and good stability
Inactive Publication Date: 2010-08-04
XUZHOU MINING BUSINESS GROUP
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Problems solved by technology
[0002] At present, the support of roadways in complex structural areas and buried deep and high ground stress surrounding rocks has always been a difficult problem in roadway support. Generally, there are conventional support, U-shaped steel retractable support, anchor mesh cable or anchor grouting support. The above-mentioned support methods are difficult to meet the support stability requirements of tunnels in complex areas and buried deep high ground stress surrounding rock, which seriously restricts the production efficiency of mine excavation, delays the mine production period, affects the improvement of economic benefits, and poses a serious threat to safe production
[0003] The pressure of the conventional support on the surrounding rock depends on the strength of the support itself to maintain the rock mass space it maintains. After the support is stressed, the structure of the support will change, and the section of the maintained roadway will be reduced. It is necessary to continuously repair the roadway, resulting in A lot of waste of money and material resources
[0004] When the U-shaped steel shrinkable support is used in soft rock roadway support, the initial shrinkable support has certain adaptability to the deformation of the roadway. As the surrounding rock of the roadway further expands, the shrinkable support is difficult to bear the influence of the total amount of surro...
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Embodiment 1
[0032] Embodiment 1: Concrete steps:
[0033] 1. Excavation construction of shaft and roadway, excavation of shaft and roadway engineering according to the designed section;
[0034] 2. Anchor mesh beam cable and sprayed concrete support construction of the roadway;
[0035] 3. On the excavated roadway floor, excavate the bottom groove section by section from the excavation working face. The bottom groove is located in the middle of the roadway floor, and a stable area of more than 1.5m is left to keep the rock mass undamaged from the two sides of the roadway; the width of the bottom groove 1.0m, upper width 1.5m, height 1.2m, the pressure relief tank is filled with broken gangue, and the upper surface is poured with concrete and shaped supports to adapt to the shape of the floor, the thickness of the floor is 50-100mm;
[0036] 4. Excavate the roadside pressure relief groove at the side of the roadway, the depth of the pressure relief groove is 600mm, and the height is 400...
Embodiment 2
[0041] 1. Pre-process each part of the U-shaped steel bracket according to the cross-section specifications of the shaft, top arch U-shaped steel 1, left arch U-shaped steel 2, right arch U-shaped steel 3, left lane side U-shaped steel 4, right lane side U-shaped steel 5 And left anti-bottom arch U-shaped steel 6, right anti-bottom arch U-shaped steel 7, and cushion block 8, guide groove 9, macromolecule composite material firm pin 10, metal card cable 11 etc. The left arch U-shaped steel 2 and the right arch U-shaped steel 3, the left lane side U-shaped steel 4 and the right lane side U-shaped steel 5 are limitedly connected by the guide groove 9, and the side arch U-shaped steel and the lane side U-shaped steel move in the guide groove. The cushion block 8 is affected by external force on the support, and the shape shrinks gradually.
[0042] 2. According to the designed cross-section, the excavation of the shaft and roadway project is carried out, and the anchor net is supp...
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Abstract
The invention discloses construction technology for a soft rock large-deformation tunnel by a de-stressing method and a matched bracket, and belongs to a high-burial depth large-deformation soft rock tunnel method and a support. The technology comprises the following steps: 1, performing tunnel tunneling construction and tunneling; 2, constructing mesh beam and shotcrete supports of the tunnel; 3, excavating a bottom plate de-stressing groove backwards from the tunneled working surface at the tunneled tunnel bottom plate; 4, constructing a tunnel wall de-stressing groove at the wall position of the tunnel; 5, setting up the matched bracket from the rear to the front; and 6, concreting at the bottom plate of the tunnel. The construction technology has the advantages that: 1, the de-stressing groove is excavated at a bottom groove, so that the tunnel is positioned in a low stress region at the initial stage of the excavation and the influence on and damage to the tunnel due to high stress are reduced after the tunnel excavation; 2, an enclosed structure where a full section and the tunnel section are adapted has high deformation resistance; 3, the bracket has a multi-stage variable bearing structure, and can prolong the time in the tunnel; and 4, an intensity-controlled buffer cushion block controls the variation rate of the bracket timely. In addition, the construction technology also has the advantages of simple structure and strong engineering practicability.
Description
technical field [0001] The invention relates to a high buried depth and large deformation soft rock roadway method and support under complex geological conditions, in particular to a soft rock large deformation roadway pressure relief method construction technology and supporting supports. Background technique [0002] At present, the support of roadways in complex structural areas and buried deep and high ground stress surrounding rocks has always been a difficult problem in roadway support. Generally, there are conventional support, U-shaped steel retractable support, anchor mesh cable or anchor grouting support. The above support methods are difficult to meet the support stability requirements of complex areas and buried deep high ground stress surrounding rock roadway, which seriously restricts the production efficiency of mine excavation, delays the mine commissioning period, affects the improvement of economic benefits, and poses a serious threat to safe production. ...
Claims
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Application Information
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