A Settlement Control Method of Open-cut Tunnel with Heavy Covering Soil in Weak Stratum

A technology for open-cut tunneling and settlement control, applied in excavation, construction, artificial islands, etc., can solve problems such as tunnel settlement, and achieve the effect of reducing construction period, saving costs, and reducing settlement.

Active Publication Date: 2018-10-16
CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP
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  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the tunnel construction process in the weak and soft layer and large overburden zone of the prior art mentioned in the above background technology is likely to cause tunnel settlement, and to provide a method for controlling the settlement of the open cut tunnel in the soft stratum and large overburden

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  • A Settlement Control Method of Open-cut Tunnel with Heavy Covering Soil in Weak Stratum
  • A Settlement Control Method of Open-cut Tunnel with Heavy Covering Soil in Weak Stratum
  • A Settlement Control Method of Open-cut Tunnel with Heavy Covering Soil in Weak Stratum

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Embodiment Construction

[0056] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0057] Such as Figure 2~3 As shown, the tunnel construction structure of this embodiment is consistent with the prior art, including two rows of enclosure piles 2 on both sides of the tunnel 1, foundation piles 3 are inserted between the enclosure piles 2, and the foundation pit is excavated to pour the tunnel 1. 1 Backfill the backfill soil layer above. There is no direct connection between the retaining pile 2 and the tunnel 1, which is a composite structure. Such as image 3 As shown, the lower end of the foundation pile 3 goes deep into the bearing layer, and the foundation pile 3 is stabilized by fixing the bearing layer.

[0058] The open-cut tunnel 1 needs to be reinforced with foundation piles 3 to prevent settlement under the condition of soft ground and heavy soil covering. Since the compressive strength of the foundati...

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Abstract

The invention relates to the technical field of tunnel subsidence control, in particular to a subsidence control method for a soft and weak stratum large-earthing open trench tunnel. Two rows of retaining piles are inserted and driven in the two sides of the tunnel along a tunnel planned path, foundation piles are constructed between the two rows of retaining piles, a dewatering well is built to lower the groundwater level between the two rows of retaining piles to be below the excavated face of a foundation pit, the foundation pit is excavated, pouring is performed on the tunnel, after the structure of the tunnel is stable, the dewatering well is closed, the groundwater level is restored, and a backfill layer is built above the tunnel in a filled manner. According to the method, due to the effects of the two aspects of restoring the water buoyancy force effect in advance and considering the effect of the retaining piles, the number of the foundation piles is reduced to an extremely large extent, the subsidence amount of the foundation piles is reduced, and therefore subsidence of the whole tunnel is reduced, cost is saved, the construction difficulty is reduced, the construction progress is accelerated, and extremely large popularization value is achieved.

Description

technical field [0001] The invention relates to the technical field of tunnel settlement control, in particular to a method for controlling the settlement of open-cut tunnels in soft strata with large overlying soil. Background technique [0002] Open-cut tunnels are carried out in weak strata and large overburden areas. Due to the poor structural stability and high groundwater level in this area, it is necessary to construct bored piles or underground diaphragm walls on both sides of the tunnel extension direction before excavation and pouring of the existing tunnel 6. Wait for existing enclosure pile 7 structures. When the groundwater level in the foundation pit drops to a certain depth below the excavation surface, then start to excavate and pour the existing tunnel 6. After the existing tunnel 6 structure is completed, start backfilling the existing backfill soil layer 9. After the completion of the tunnel, the dewatering well will be removed. Returning to the natural s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D29/05E02D17/04E02D19/10E02D33/00
CPCE02D17/04E02D19/10E02D29/05E02D33/00
Inventor 肖明清邓朝辉刘浩彭长胜黄胜蔡永昌
Owner CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP
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