Method for evaluating radial coupling property of supporting system for confined concrete arch
A technology of confining concrete and evaluation methods, which is applied in the direction of instruments, measuring devices, scientific instruments, etc., can solve the problems of imperfect confinement concrete, lack of design ideas and system evaluation methods for arch support effects, etc., and achieve simple and easy parameters The effect
Active Publication Date: 2017-06-13
SHANDONG UNIV
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Problems solved by technology
[0003] However, so far, the theoretical research on confined concrete at home and abroad is still incomplete, and the parameter design of on-site confined concrete arch support is still mainly based on experience, lacking a perfect design idea and a systematic evaluation method for the effect of arch support
Method used
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Embodiment 1
[0032] Embodiment 1: as figure 1 As shown, a method for evaluating radial coupling characteristics of a confined concrete arch support system of the present invention includes the following steps:
[0033] Step 1: Excavate the tunnel, install temporary support, hang the steel mesh, then spray a layer of concrete, then conduct fixed-point drilling on the surface of the sprayed concrete surrounding rock, and then place the base point anchor head of the multi-point displacement meter in the hole At the bottom, the measuring rope is drawn out, and then the borehole is grouted with cement mortar that is consistent with the shotcrete ratio of the surrounding rock. until full.
[0034] The above-mentioned "excavating tunnels, installing temporary supports, hanging steel mesh, and spraying concrete" are all realized by existing technical means, so they will not be described in detail here.
[0035] Step 2: After drilling and grouting, splice and install the confined concrete arch 4;...
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The invention discloses a method for evaluating a radial coupling property of a supporting system for a confined concrete arch. A multi-point displacement meter is placed through drilling a hole in a surrounding rock; a stain gage is stuck at the position of the confined concrete arch and a strain brick is placed inside corresponding core concrete; during secondary lining, the multi-point displacement meter is buried in a fixed point manner; through the conversion between strain and a displacement, the radial coupling coefficient K of the supporting system for the confined concrete arch is obtained; the global coupling property of the confined concrete arch is intuitively evaluated. The method is simple, easy and feasible to operate, has quite high operability in actual construction, is simple and intuitive in data processing, and can be used for quite well reflecting the steel-concrete coupling property of the confined concrete arch; the reference is provided for further modifying the parameter of an arch support; thus, the safety and the economical efficiency of the engineering construction of the confined concrete arch are guaranteed.
Description
technical field [0001] The invention relates to a radial coupling characteristic evaluation method of a restrained concrete arch support system. Background technique [0002] With the continuous development of tunnel construction in my country, the span of the tunnel is getting larger and larger. During the construction process, complex conditions such as high ground stress, soft rock, fault fracture zone, bias pressure, and water spray are often encountered, making it difficult to support the surrounding rock of the tunnel, resulting in Deformation and damage seriously affect construction safety. Traditional support methods often appear powerless in the face of these engineering problems. As a new type of support, confined concrete arch support has a series of advantages such as high ductility, high compressive strength, and flexible structure, and is gradually playing an increasingly important role in tunnel construction. [0003] However, so far, the theoretical research ...
Claims
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Login to View More IPC IPC(8): G01N33/00
CPCG01N33/00
Inventor 王琦秦乾许英东潘锐李术才栾英成江贝于恒昌孙会彬鹿伟
Owner SHANDONG UNIV