Excavation supporting method for foundations high in ground stress and easy to loose
A high ground stress and relaxation technology, applied in excavation, foundation structure engineering, construction, etc., can solve the problems of relaxation and unloading, foundation excavation, etc., to achieve the effect of solving high ground stress, ensuring project safety, quality and integrity
Active Publication Date: 2014-09-10
POWERCHINA HUADONG ENG COPORATION LTD
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Problems solved by technology
If the secondary excavation process is adopted, it may still lead to unfavorable construction situations such as relaxation and unloading after excavation, and foundation excavation.
Method used
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[0013] Such as figure 1 As shown in -3, in this embodiment, the excavation and support construction is carried out on the basis of high ground stress and easy relaxation. The high ground stress and easy relaxation foundation includes the design base surface 4, and the design base surface is covered with rock mass protection with a thickness of 1-2m. Layer 1, adjacent to the rock mass protection layer is the outermost step excavation face 2, and the excavation and support methods include:
[0014] 1.1, the first phase of ordinary mortar bolt support, such as figure 1 As shown, after excavating to the step excavation surface 2 adjacent to the rock mass protective layer 1, drill ordinary mortar anchor rods on the platform 2-1 of the excavation surface, and drill holes deep into the design foundation surface 4 up to 6m. Ordinary mortar anchors 5 are inserted inside, and the specifications of ordinary mortar anchors are: diameter 32mm, length 6m, spacing 3m×3m, rectangular layout,...
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The invention relates to an excavation supporting method for foundations high in ground stress and easy to loose. The technical scheme includes that the foundations high in ground stress and easy to loose comprise design foundation faces, thick rock mass protection layers cover the designed foundation faces, and outermost bench excavation faces are adjacent to the rock mass protection layers. The excavation supporting method includes 1, supporting the foundations by the aid of first-stage common mortar anchor rods, drilling common mortar anchor rod holes in platforms of the excavation faces after the bench excavation faces adjacent to the rock mass protection layers are excavated, and inserting the common mortar anchor rods into the holes; 2, supporting the foundations by the aid of second-stage detachable prestressed anchor rods, and arranging the detachable prestressed anchor rods among the first-stage common mortar anchor rods after the tops of the rock mass protection layers are excavated; 3, removing the rock mass protection layers by means of excavation, and detaching the detachable prestressed anchor rods in the rock mass protection layers. The excavation supporting method for the foundations high in ground stress and easy to loose has the advantages that problems can be solved, and long-term loose unloading effects of the foundations high in ground stress and easy to loose can be prevented or reduced by the aid of the excavation supporting method.
Description
technical field [0001] The invention relates to an excavation and support method for foundations with high ground stress and easy relaxation. It is suitable for preventing or reducing the long-term relaxation and unloading effect of high ground stress and easy-to-loose foundations in water conservancy, hydropower, transportation and other projects. Background technique [0002] In water conservancy, hydropower, transportation and other projects, high ground stress rock mass or rock mass that is easy to relax and unload (such as columnar joint basalt) foundations are often encountered. The release of internal stress in the rock mass or the relaxation of hidden cracks in the rock mass may lead to layered voids and relaxation in the foundation rock mass, reducing the quality and integrity of the rock mass after excavation. If it is processed through secondary excavation, it may still lead to unfavorable construction situations such as loosening and unloading again after excava...
Claims
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Inventor 张伟狄祝青
Owner POWERCHINA HUADONG ENG COPORATION LTD