Expressway steep-dipping phyllite grade IV and grade V surrounding rock construction method
A technology for expressway and tunnel construction, applied in tunnels, tunnel linings, earthwork drilling and mining, etc., can solve the problems of untimely support closure, difficult quality control, and difficult guarantee of safety, and achieve small disturbance of surrounding rock and controllable quality , the effect of small deformation
Inactive Publication Date: 2020-08-25
四川省交通勘察设计研究院有限公司
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Problems solved by technology
[0005] The technical problem to be solved by the present invention is that the traditional construction method has many construction steps, the support is not closed in time, the surrounding rock is greatly disturbed, the safety is not easy to guarantee, the quality control is difficult, and the work efficiency is low
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[0039] as the picture shows, figure 1 It is the elevation view of the mechanical excavation full-section construction method of the present invention, figure 2 It is a longitudinal sectional view of the mechanical excavation full-section construction method of the present invention.
[0040] A method for constructing tunnels with steep phyllite grade IV and grade V surrounding rocks of expressways, comprising the following steps,
[0041] Step 1, advanced geological prediction, advanced horizontal drilling: use advanced long-short-distance geophysical prospecting for geological prediction, and use multi-functional drilling rigs for horizontal drilling verification on the face;
[0042] Advanced long-short-distance geophysical prospecting is used for geological prediction, and horizontal hole drilling verification is carried out on the face. Horizontal drilling uses multi-functional drilling rigs, such as C6 drilling rigs, with a drilling depth of about 75m each time, which c...
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The method provides an expressway steep-dipping phyllite grade IV and grade V surrounding rock construction method. According to the method, the tunnel construction progress can be improved, drill footage per month can be increased by 20 m, disturbance of surrounding rock is small at the same time, and initial support deformation is smaller compared with construction deformation of a bench cut method, a CD and a CRD. In addition, full-face tunneling is conducted by adopting a heading machine or a drill jambo, construction is simple, disturbance is small, construction personnel in front of a tunnel face are few, construction is safe, and quality is controllable. The method can be widely applied to excavation of expressway tunnel phyllite, is mainly characterized in mechanized and full-facetunneling, and is simple in construction, and small in disturbance, construction personnel in front of the tunnel face are few, the construction is safe, the quality is controllable, and the method issuitable for social development.
Description
technical field [0001] The invention relates to the field of highway tunnels, in particular to a construction method for tunnels with steep phyllite IV and V grade surrounding rocks in expressways. Background technique [0002] In recent years, more and more mountain roads have been planned and constructed. More and more tunnels have also been planned and built, especially in some southwestern mountainous areas. The tunnels with high seismic intensity, accompanied by fault fracture zones, and water-rich phyllite strata have brought great difficulties to tunnel construction. The initial support is long-term. Deformation, a large amount of deformation, has brought great hidden dangers to tunnel construction safety and structural safety. For a long time, due to the lack of means of advanced support and rapid closure, phyllite tunnels in my country generally adopt segmental construction methods such as step method, CD, and CRD. Main disadvantages: There are many construction s...
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Patent Timeline
Login to View More IPC IPC(8): E21D11/10E21D11/15E21D11/18E21D9/11
CPCE21D9/11E21D11/10E21D11/152E21D11/18
Inventor 张生章志高雷良王建华陈华张武先赵虎强
Owner 四川省交通勘察设计研究院有限公司