Soil pressure balance model tunnel boring machine capable of realizing lining support function

Abstract

The invention discloses a soil pressure balance model tunnel boring machine capable of realizing a lining support function. The soil pressure balance model tunnel boring machine comprises a model box,a shield shell, a cutting system, a jacking system, a soil excavating system and a supporting system. The lining is fixed to the outer side of the shield shell before a test and is concentric with the section of the shield shell. Before the test, the lining is fixed to the shield shell by a connecting device. Then, the jacking system and the cutting system are started, and the cut soil flows intoan earth pressure tank. After stable soil pressure is established in the earth pressure tank, and a spiral soil excavator is started to discharge soil. During the test, the excavation surface is keptstable by adjusting the cutter speed, the jacking speed and the rotating speed of the spiral soil excavator. After the excavation, the lining is fixed to the model box by a fixing flange, the tunnelboring machine is withdrawn from the model box, and the lining is left in the tunnel. The model tunnel boring testing machine can achieve research on the tunneling parameters of the tunnel boring machine and the influence of its construction on the stratum and existing structures.

Description

technical field [0001] The invention relates to an earth pressure balance model shield testing machine capable of realizing the lining support function, and belongs to the technical field of shield tunneling tests. Background technique [0002] Tunnels built by the shield method have fast construction speed, low noise, and do not affect ground traffic. They are the first choice for urban subway tunnel construction. However, the construction of the shield method will inevitably have an impact on the surrounding strata and the environment. The field test period is long, the cost is high, and it is greatly affected by the stratum conditions. Therefore, it is an important research to use the model shield machine to carry out the tunnel excavation simulation test. method. In order to better study the impact of shield tunneling construction on the surrounding environment in the laboratory, many scholars at home and abroad have conducted research on model shield tunneling machines...

AI Technical Summary

Problems solved by technology

However, the construction of the shield method will inevitably have an impact on the surrounding strata and the environment. The field test period is long, the cost is high, and it is greatly affected by the stratum conditions. Therefore, it is an important research to use the model shield machine to carry out the tunnel excavation simulation test. method

In order to better study the impact of shield tunneling construction on the surrounding environment in the laboratory, many scholars at home and abroad have conducted research on model shield tunneling machines, such as the small shield tunneling machine developed by Nomoto (1999) et al. machine, a small model shield machine suitable for clay established by Champan (2006), and a small shield simulation test bench developed by Shanghai Tunnel Co., Ltd. (1996). Shanghai Tunnel Co., Ltd. jointly with Zhejiang University and Tongji University (2004) developed a large-diameter model shield machine, Tongji University (2006) developed a double-hull single-spiral model shield, Beijing Jiaotong University (2007) developed an earth pressure balance shield equipment, He Chuan (2013) developed a The small-diameter mud-water balance shield machine, the small-diameter mud-water balance shield machine developed by Shandong University (2016), etc. These model shield tunneling machines can simulate the tunneling process of the shield well, but they cannot realize the tube tunneling during shield tunneling. Chip support function

Shanghai University (2013) designed an earth pressure balance shield test device that can realize the lining support function, but the design of the test system is relatively simple, which is quite different from the real shield machine, and the design of the earth pressure chamber is only suitable for Soft clay with good flow plasticity, limited scope of application

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