A Method for Discriminating and Predicting the Stability of Tunnel Primary Support Based on the Principle of Electromagnetic Radiation
A technology of initial support and electromagnetic radiation, applied in electromagnetic measurement devices, electric/magnetic solid deformation measurement, earthwork drilling, etc., can solve the problems of inconvenient large-scale adoption, complicated operation, and expensive evaluation methods, and achieve on-site testing. Simple, Accurate Effects
Active Publication Date: 2021-05-25
FUZHOU UNIV
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Problems solved by technology
[0004] The object of the present invention is to provide a kind of method based on the principle of electromagnetic radiation to distinguish and predict the stability of tunnel primary support, to solve the problem mentioned in the above-mentioned background technology that the stability, Monitoring and judging the degree of stability, and the existing judging methods are expensive, complicated to operate and not easy to use on a large scale in the field
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Embodiment 1
[0032] For the dangerous section where the initial support may be unstable and damaged (including the initial support ring section and the ring section), the monitoring section is set at a certain interval, and the interval between the monitoring sections is generally set to 5m. Electromagnetic radiation monitoring points are arranged in representative locations such as figure 2 and image 3As shown, before the inverted arch is backfilled, the electromagnetic radiation monitoring points are generally arranged at the vault 1, the left arch waist 2, the right arch waist 3, the left wall 4, the right wall 5, the left arch foot 6, the right foot 7 and the middle of the inverted arch 8. After the inverted arch is backfilled, the electromagnetic radiation monitoring points are generally arranged at the vault 1, the left arch waist 2, the right arch waist 3, the left wall 4, the right wall 5, the left arch foot 6, the right foot 7 and the middle of the floor 9; For the initial supp...
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The invention discloses a method for judging and predicting the stability of the initial support of a tunnel based on the principle of electromagnetic radiation, which includes the following steps: S1: for the dangerous sections where the initial support may be destabilized and damaged (including the uncirculated section of the initial support and the In the ring section), the monitoring section is set at a certain interval, and the electromagnetic radiation monitoring points are arranged at the representative positions on the monitoring section; S2: The initial support surface of the tunnel at each monitoring point is monitored by a portable electromagnetic radiation monitor The intensity of electromagnetic radiation at different time periods, and the conventional tunnel deformation monitoring is carried out synchronously at each monitoring point. The monitoring method of the present invention does not need to embed any equipment in advance, the on-site test is simple, basically has no interference to the construction, and can be tested in a large range, and is suitable for wide-scale adoption in tunnel engineering under complex geological conditions; the monitoring results can reflect the relative size of surrounding rock pressure, The change trend and key parts of primary support deformation and failure can meet the basic needs of primary support stability analysis and evaluation.
Description
technical field [0001] The invention relates to the technical field of tunnels and underground engineering, in particular to a method for identifying and predicting the stability of initial support of tunnels based on the principle of electromagnetic radiation. Background technique [0002] During tunnel construction, primary support yield, instability and failure are caused by surrounding rock deformation and compression of support structure caused by tunnel excavation. The deformation rate of the initial support in a stable state is relatively slow. After local yielding or instability occurs, the deformation rate will gradually increase, and the growth rate will become faster and faster. Eventually, the overall instability or regional instability of the initial support will be caused by local instability. destroy. The instability of the initial support will directly threaten the safety of construction personnel and machines, affect the construction progress, and cause was...
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IPC IPC(8): E21F17/18G01B7/16
CPCE21F17/18G01B7/16
Inventor 刘成禹罗洪林闫红江邓志刚
Owner FUZHOU UNIV