Test method for simulating active damage of shield tunnel excavation face

A technology of tunnel excavation and test method, which is applied in the direction of tunnels, earthwork drilling, mining equipment, etc., can solve the problems of not considering the early excavation process of the model shield, and achieve the effect of scientific model test results

Inactive Publication Date: 2018-08-28
BEIJING UNIV OF TECH
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Problems solved by technology

[0005] There have been many tests in China to simulate the active failure of the excavation surface of the tunnel, but most of them are displacement control, that is, the active failure process of the excavation surface of the tunnel is simulated by the retreat of the support baffle, which is different from the active failure of the excavation surface of the real shield tunnel. The situation does not match
There are also model tests at home and abroad that use the model shield machine to simulate the stability of the excavation surface. However, the model shield machine is generally pre-embedded in the soil, the cutter head is directly rotated to cut the soil, and then the soil is manually unearthed, without considering the model. The pre-excavation process of shield tunneling

Method used

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  • Test method for simulating active damage of shield tunnel excavation face
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  • Test method for simulating active damage of shield tunnel excavation face

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Embodiment approach

[0042] Implementation method and effect:

[0043] The above example of the present invention, through the method of installing miniature earth pressure gauge and miniature piezometer on the cutter head of the model shield machine, pre-buried grating scale displacement gauge in front of the excavation face, and buried LVDT displacement gauge on the ground surface, completed a simulated shield tunneling The monitoring scheme of the test method for the active failure of the tunnel excavation surface; through the test method of the cutter head of the model shield machine idling and the screw excavator unearthed, the process of active destruction of the real shield machine is simulated. From this, the limit support force on the excavation face of the model shield machine, the soil damage area in front of the excavation face and the surface subsidence range can be obtained. The invention can be used to simulate the process of actively destroying the excavation surface of the shield ...

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Abstract

The invention discloses a test method for simulating the active damage of a shield tunnel excavation face. The method includes the steps that after filling in a model box is completed, standing is performed for a period of time, and initial readings on micro water-soil pressure monitoring elements on the cutterhead of a model shield machine, a displacement meter monitoring element in soil in frontof the excavation face and a displacement meter monitoring element on the earth surface are recorded; the model shield machine is made close to the hole of the model box; a jacking motor, a cutterhead motor and a spiral excavator motor of the shield machine are turned on at the same time, and the model shield machine starts tunneling; when the model shield machine excavates to a preset position,the jacking motor, the cutterhead motor and the spiral excavator motor are turned off at the same time; a shield excavation face active damage test is started; the water-soil pressure value on the cutterhead, the displacement value of the soil in front of the excavation face and the settling volume of surface soil are recorded, and after standing for a period of time, numerical values of the monitoring elements are measured. In the method, it is taken into account that the early excavation process of the model shield is consistent with the truth of the influence of the early tunneling processon the true active damage of the shield excavation face.

Description

technical field [0001] The invention relates to the field of tunnel engineering, in particular to a test method for simulating the active damage of the excavation surface of a shield tunnel. Background technique [0002] With the pace of development and utilization of urban underground space in my country, major cities in China, especially first-tier cities such as Beijing and Shanghai, have widely adopted the shield method for urban subway construction. However, since the large-diameter shield tunneling project in our country has only gradually developed in recent years, it is still in its infancy both in terms of construction technology and theoretical research. Therefore, there are many deficiencies in the theoretical research on shield tunneling, which need to be studied deeply and systematically by scholars at home and abroad. [0003] Due to the strict requirements on the surrounding buildings, structures and formation deformation of the shield, the requirements for t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/00E21D9/08E21D9/12
CPCE21D9/003E21D9/08E21D9/124
Inventor 杜修力宋伟涛李鹏飞龚秋明许成顺李政林庆涛路德春唐贞云
Owner BEIJING UNIV OF TECH
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