A Model Test Method for Small Clear Distance and Large Section Tunnel in Steeply Inclined Jointed Stratum
A technology of tunnel model and small clear distance, which is applied in the direction of instruments, measuring devices, scientific instruments, etc., and can solve the problems of small but not macroscopically displayed test rules, limited simulation of shield excavation, and unsatisfactory rigidity, etc.
Active Publication Date: 2021-09-24
CHONGQING JIAOTONG UNIVERSITY
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Problems solved by technology
Li Wei used aluminum wire with a diameter of 0.1mm to simulate the anchor rod body, and iron wire with a diameter of 5mm to simulate the steel support [Li Wei. Model test and numerical simulation research on tunnel excavation support based on structural stress environment [D]. Changsha University of Science and Technology ,2011.], although the material can simulate the bolt, but the diameter of the aluminum wire is too thin, and its rigidity is not enough, it is easy to deform during the compaction process, it is difficult to control, and its model test is too small to show the test rule macroscopically; Zhang Zhiguo used hollow aluminum tubes to simulate the tunnel lining, and used a water-filled rubber film to simulate the deformation of the surrounding rock of the tunnel. The hollow aluminum tube section cannot conform to the multi-center section of the tunnel, so it can only simulate shield excavation technology. Water-filled rubber film Comparing the surrounding rock material prepared by the laboratory to simulate the deformation of the surrounding rock does not meet the actual rigidity requirements of the surrounding rock. The water-filled rubber membrane has a small stiffness and cannot play the supporting role of the surrounding rock; Shao Zhushan relies on advanced experimental equipment to simulate the creep deformation characteristics of the surrounding rock , the operation is complex and the distribution of the jacks is high. If the distribution of the jacks is uneven, stress concentration will easily occur and the experiment will fail.
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Embodiment 1
[0030] figure 1 It is a schematic diagram of the tunnel model test box in the present invention, figure 1 Among them, 1 is the grid frame, 2 is the steel plate, 3 is the base, 4 is the observation window, 5 is the baffle of the observation window, and 6 is the tunnel.
[0031] image 3 It is a schematic diagram of a well-tac-toe frame in the present invention, image 3 Among them, 7 is the supporting part, 8 is the peripheral layer, 9 is the arch ring, and 10 is the anchor rod.
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Abstract
The invention relates to a model test method for a tunnel with a small clear distance and a large section in a steeply inclined joint stratum, and belongs to the technical field of tunnel engineering in geotechnical and underground engineering. In this method, by using a specific well-shaped frame, it is possible to better simulate the partial excavation of small-space and large-section tunnels in steeply inclined joint formations in actual engineering, wherein the support part of the well-shaped frame is welded by steel plates, and the steel plates It is completely separated to reduce the disturbance of the excavated part to the unexcavated part of the rock and soil when excavating in blocks, and at the same time assumes the role of temporary support; the arch ring of a specific size in the well-shaped frame is used in the simulated tunnel excavation process It can play a good supporting role. The iron sheet with a specific thickness in the well-tac-toe frame isolates the surrounding rock filled in the tunnel from the surrounding rock outside the excavation limit. The rigidity of the iron sheet meets the deformation requirements, and the surrounding rock material is filled inside and compacted Finally, the excavation limit can be effectively guaranteed. This method can truly, comprehensively and intuitively reflect the stress characteristics, deformation tendency and stability characteristics of the surrounding rock during tunnel excavation.
Description
technical field [0001] The invention belongs to the technical field of tunnel engineering in geotechnical and underground engineering, and in particular relates to a model test method for a tunnel with a small clear distance and a large section in a steeply inclined joint stratum. Background technique [0002] The theoretical analysis of tunnel mechanics cannot fully reflect the actual engineering conditions, so many scholars at home and abroad have proposed model test research methods, which can avoid the difficulties in mathematics and mechanics under the condition of basically satisfying the similarity principle, and truly, comprehensively and intuitively Reflecting the stress characteristics, deformation trend and stability characteristics of the surrounding rock during tunnel excavation, the tunnel model test has become an important method to study tunnel problems. [0003] In the tunnel model test process, the selection of materials with similar mechanical properties t...
Claims
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IPC IPC(8): G01N3/00
CPCG01N3/00G01N2203/0003G01N2203/0048G01N2203/0075G01N2203/0208
Inventor黄锋刘星辰唐维屈苗迪万国庆董广法
OwnerCHONGQING JIAOTONG UNIVERSITY