Step-by-step controllable unloading test device

Abstract

The invention discloses a step-by-step controllable unloading test device. The step-by-step controllable unloading test device comprises a solvent injection system, a model test box and a waste recovery system. A tunnel model device is arranged in the model test box, a to-be-dissolved material, a guide pipe which is used for the solvent to get in and out and a sensor are arranged in the tunnel model device, the periphery of a tunnel model is coated with a latex film so as to isolate external soil from the to-be-dissolved material, and the sensor is connected with a dynamic signal analyzer which is arranged outside the tunnel model. Meanwhile, the invention also discloses a test method for controllably realizing the excavation of a tunnel unloading part. According to the step-by-step controllable unloading test device, the used materials are easy to acquire and can be produced in a short time, so that the comparative study on completing multiple tunnel construction methods by a great amount of experiments is facilitated. In the test method, the tunnel step-by-step unloading and excavation process can be precisely and controllably realized by adjusting the inlet-outlet rate of the solution and adopting the sensor data.

Description

technical field [0001] The invention relates to the field of simulated underground engineering excavation calculation, in particular to a step-by-step controllable unloading test device. Background technique [0002] Due to the complexity of the rock and soil mass itself, the model test is widely used in the research of rock and soil mechanics and engineering, especially for the simulation of underground engineering such as tunnel excavation and foundation pit excavation. Through the simulation of the tunnel construction process and the analysis of the test data, it can provide reference and reference for the design and construction of the tunnel, and also provide effective research methods and approaches for ensuring the efficient and safe operation of the tunnel structure. The mechanical effects of rock and soil materials are related to the stress path, and different construction methods correspond to different stress paths, which in turn have different effects on the surr...

AI Technical Summary

Problems solved by technology

The tunnel engineering model experiment equipment for unloading step-by-step excavation is still very rare. However, with the increasing scale and difficulty of tunnel engineering in rock and soil, the engineering problems that arise are more complicated, and the content that needs to be studied is also increasing. More and more, the requirements for model test design and calculation accuracy of tunnel and underground engineering construction are getting higher and higher

Therefore, the existing test equipment can no longer meet the needs of engineering practice in terms of functions, excavation methods, stress paths of elastic-plastic materials, and the range and uniformity of the strain field formed in the model. Therefore, it is urgent to develop a A kind of test equipment that can realize unloading excavation, step by step, tunnel model can be pre-designed according to actual engineering, accurate and controllable, to meet the needs of tunnel and underground engineering research

[0004] In view of the necessity of using tests to simulate the tunnel excavation process, at present, many scholars use different methods to achieve this purpose. For example, Wang Mingming (1995) loaded the test body in a horizontal manner in a specially made test pit, However, it adopts the method of "digging first, then loading" to simulate tunnel excavation, which is different from the actual project; Zhou Xiaowen (1999) used the pressure relief of the inflatable bag to simulate tunnel excavation, but this method is relatively It is suitable for tunnels with standard circular sections, but it is not satisfactory for the simulation of general long-span flat section highways and railway tunnels; Huang Lunhai (2004) used built-in jacks to simulate the mechanical response of rock mass inside the tunnel, but this method is still under development. There is a certain degree of difficulty in small-scale experiments

Ding Wenqi (2009) used tunnel module sub-slices to accurately simulate the full-face excavation process, and realized the excavation method of "loading first, then digging". However, this method cannot simulate step-by-step excavation methods such as the step method

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