A method for identifying the surrounding rock load on the outer surface of a three-dimensional tbm shield
A technology of load identification and outer surface, which is applied in the direction of earthwork drilling, equipment, machine/structural component testing, etc., can solve problems such as narrow gaps and difficulties, and achieve high calculation accuracy and good visualization effects
Active Publication Date: 2019-09-03
INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI
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Problems solved by technology
However, the gap between the surrounding rock and the shield is narrow and there is a strong interaction. It is still difficult to install sensors on the outer surface of the shield to directly monitor the surrounding rock load.
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[0043] The following describes in detail with reference to the embodiments and accompanying drawings.
[0044] Such as figure 1 , the specific implementation steps of this method are as follows:
[0045] ① Install the strain monitoring sensor-101 at the preset measuring points on the inner surface of the TBM shield
[0046] The number of preset measuring points should be as large as possible and evenly distributed, avoiding the action area of the moving mechanical components inside the shield;
[0047] The strain monitoring sensor adopts a surface strain gauge or an optical fiber strain sensor, and the sensor is arranged axially and circumferentially along the inner surface of the shield at each measuring point, or arranged along a single direction, and protective measures need to be applied to the sensor at the same time;
[0048] In this embodiment, surface strain gauges are used, and 36 measuring points are evenly arranged on the inner surface of the shield, and the str...
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The invention discloses a method for identifying surrounding rock load on an outer surface of a three-dimensional TBM shield, and relates to the technical field of high-efficiency tunneling and safetycontrol of a deep tunnel shield type TBM. The method comprises: 1, installing a strain monitoring sensor on a preset measuring point on an inner surface of a TBM shield; 2, obtaining strain measureddata of the measuring point [epsilon]m; 3, establishing a finite element calculation model of the TBM shield; 4, obtaining a load identification parameter through partition of the shield outer surface; 5, through Newton iteration and Moore-Penrose generalized inverse solution, obtaining surrounding rock load on the outer surface of the shield; 6, performing integration on the load to obtain outersurface friction resistance of the shield. The method has high calculation precision and good visualization effect, and is suitable for identification of outer surface load of the TBM shield on site,and can provide guidance for safe construction of tunneling, early warning of a stuck machine, and accident handling.
Description
technical field [0001] The invention relates to the technical field of high-efficiency excavation and safety control of shield-type TBMs in deep-buried tunnels, in particular to a method for identifying surrounding rock loads on the outer surface of a three-dimensional TBM shield. Background technique [0002] The TBM (Tunnel boring machine) construction method has the advantages of high quality, high efficiency, economy, safety and environmental protection compared with the traditional drilling and blasting method, and has become a priority consideration in the construction of deep and long tunnels. However, when the TBM passes through the deeply buried high-stress weak and fractured strata, the surrounding rock is prone to extrusion and large deformation under the action of excavation disturbance. Once the deformation of the surrounding rock exceeds the reserved gap between the TBM shield and the surrounding rock, the surrounding rock will squeeze the shield. When the rate...
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IPC IPC(8): G01M99/00E21D9/06E21D9/00E21F17/18
Inventor 刘鹤刘泉声唐旭海刘滨黄兴罗慈友桑昊旻
Owner INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI