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Testing device and method for simulating shield tunnel excavation of karst region

A technology of shield tunnel and test device, which is applied in the direction of using mechanical devices, measuring devices, instruments, etc., can solve the problems of few model tests, failure to consider earth pressure balance, incomplete solution of transferring excavated soil mass, etc., so as to achieve convenient travel. Effect

Pending Publication Date: 2018-09-04
DALIAN JIAOTONG UNIVERSITY
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Problems solved by technology

[0003] Scholars at home and abroad have conducted a series of model tests on issues related to shield tunnel excavation. However, there are few model tests on karst areas, and most of the experimental devices have not completely solved the problem of transferring excavated soil. pressure balance

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  • Testing device and method for simulating shield tunnel excavation of karst region
  • Testing device and method for simulating shield tunnel excavation of karst region
  • Testing device and method for simulating shield tunnel excavation of karst region

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Embodiment Construction

[0036] The features of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0037] Such as Figure 1-7As shown, a test device for simulating the excavation of shield tunnels in karst areas includes a test box 1, a shield excavation device 2, a support frame 3 and a measurement system. The support frame 3 and the test box 1 pass through the bottom plate 4 connection; the test box 1 has a bottom and an open mouth, and the test box 1 is equipped with soil, the surface of the soil is lower than the opening surface of the test box, and the karst cave 23 is placed in the soil, and the two opposite walls of the test box 1 Holes are prefabricated on the top, and an annular steel pipe channel 6 is arranged outside the periphery of the holes on the outer sides of the two walls to ensure that the shield excavation device 2 enters the test chamber 1 for excavation and soil stability; the shield excavation device 2 ...

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Abstract

The invention discloses a testing device and method for simulating shield tunnel excavation of a karst region. The testing device comprises a testing box, a shield excavation device, a supporting frame and a measurement system, wherein the supporting frame is connected with the testing box through a bottom plate; holes are pre-formed in two opposite wall surfaces of the testing box; the shield excavation device comprises a cutterhead, a shield machine body, a fixed motor and an outer pipe; the supporting frame comprises a counter-force support, a worktable and a thread steel column; the measurement system comprises a sedimentation rod, a displacement sensor and a pressure box. According to the testing device and method, disclosed by the invention, the problems in actual engineering that the monitoring work is difficult and measurement projects are not comprehensive are solved. More data foundations are provided for establishing mechanical models for tunnel excavation under different working conditions, and comprehensively researching influences of the shield tunnel excavation of the karst region on a soil body and a surrounding soil body deformation mechanism. A test design is carried out based on a similarity principle so that an obtained testing result has certain reference meaning on predication of actual surrounding soil body deformation of the karst region and stratum displacement.

Description

technical field [0001] The invention belongs to the technical field of underground engineering geotechnical shield tunneling in the field of civil engineering, and in particular relates to a test device and method for simulating excavation of shield tunnels in karst areas. technical background [0002] The problem of karst is a worldwide problem, and it is also an unavoidable problem in the construction of subway projects in various countries. Many scholars and engineers at home and abroad have conducted a lot of discussions and research on the mechanism of karst development, karst survey methods, karst construction treatment and risk assessment methods. The research on the construction process of shield tunneling is of great significance for understanding the structural characteristics of shield tunneling itself and its impact on the surrounding environment. Among them, relatively intuitive results can be obtained by using experimental methods to conduct related research. D...

Claims

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Application Information

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IPC IPC(8): G01N19/00
CPCG01N19/00
Inventor 王海涛苏鹏吴跃东张小浩古兴康庄心欣
Owner DALIAN JIAOTONG UNIVERSITY
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