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Construction method of residual slope wash tunnel with shallow cover and unsymmetrical pressure

A construction method and technology for tunnels, which are applied to tunnels, tunnel linings, earth-moving drilling and mining, etc., can solve problems such as hole-forming work and the safety of construction equipment and personnel cannot be guaranteed, soil stability analysis is difficult, and the excavation surface is distorted and deformed. Achieve the effect of shortening the construction period, significant economic benefits, and saving engineering costs

Active Publication Date: 2015-08-05
中铁二十四局集团福建铁路建设有限公司 +1
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Problems solved by technology

[0002] The soil quality of residual slope accumulation tunnels is characterized by large porosity, low strength, and high compressibility. It is easy to collapse, which is quite unfavorable for tunnel body excavation, tunnel waterproofing, and zero settlement control. The direct vertical load of the jacking soil and the lateral unbalanced horizontal pressure act together, and the influence of the uneven distribution of ground stress makes the analysis of soil stability very difficult. In the process of entering the hole, the force balance of the original soil must be destroyed system, adopt effective, operable and reasonable technical measures to rebalance the stress system of the soil during construction, otherwise it will cause geological disasters such as distortion and collapse of the excavation surface, making the safety of the tunneling work and construction equipment personnel unsafe. Guaranteed

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  • Construction method of residual slope wash tunnel with shallow cover and unsymmetrical pressure
  • Construction method of residual slope wash tunnel with shallow cover and unsymmetrical pressure
  • Construction method of residual slope wash tunnel with shallow cover and unsymmetrical pressure

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0024] Such as Figure 1~2 As shown, the solution adopted by the present invention to solve the technical problem is a construction method of a shallow-buried bias-pressure residual slope soil tunnel, which is characterized in that it comprises the following steps:

[0025] (1) Side and upside slope trimming and drainage ditch construction, construction of the top of the cave and side slope, upside slope intercepting ditches and drainage ditches, the original gully of the line will be diverted to outside the tunnel range, and the intercepting ditch will be set on the side, side and upside slopes. The slope beyond the top of the slope is not less than 5m, and the slope of the ditch bottom is not less than 3%, so as to avoid silting and water flow to wash the working surface and affect the surface grouting effect;

[0026] (2) Carry out surface ...

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Abstract

The invention relates to a construction method of a residual slope wash tunnel with a shallow cover and the unsymmetrical pressure. The scheme with the step of ground surface grouting and shotcrete anchorage combined supporting, the step of pre-reinforcement of a long pipe shed and the step of correction three-stair four-step excavation construction is adopted, construction is conducted layer by layer from outside to inside, and operation that the deep-cover unsymmetrical pressure side is excavated, supporting is conducted, then the shallow-cover unsymmetrical pressure side is constructed, and an asymmetrical initial supporting structure is used for conducting construction according to the unsymmetrical pressure of surrounding rock is conducted, so that the supporting structure is optimized, the working procedure is more reasonable, and the construction speed is increased.

Description

technical field [0001] The invention relates to a construction method of a shallow-buried bias-pressure residual slope soil tunnel. Background technique [0002] The soil quality of residual slope accumulation tunnels is characterized by large porosity, low strength, and high compressibility. It is easy to collapse, which is quite unfavorable for tunnel body excavation, tunnel waterproofing, and zero settlement control. The direct vertical load of the jacking soil and the lateral unbalanced horizontal pressure act together, and the influence of the uneven distribution of ground stress makes the analysis of soil stability very difficult. In the process of entering the hole, the force balance of the original soil must be destroyed system, adopt effective, operable and reasonable technical measures to rebalance the stress system of the soil during construction, otherwise it will cause geological disasters such as distortion and collapse of the excavation surface, making the saf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/00E21D11/00E21D11/10E02D17/20E02D3/12
Inventor 杨少龙林瑞棋邓历振叶福兴刘德标苏道灵
Owner 中铁二十四局集团福建铁路建设有限公司
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