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Ultrathick coral chip-contained stratum foundation pit water stop structure and method

A coral debris and water-stopping technology, which is applied to underwater structures, infrastructure engineering, water conservancy projects, etc., can solve the problem that water-stopping curtains are difficult to block groundwater seepage, typhoons, heavy rains, and tidal effects. The problem of large coefficients, etc.

Inactive Publication Date: 2017-04-19
上海市建工设计研究总院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] (3) It is greatly affected by typhoons, rainstorms, and tides
[0010] The existing water-stop measures are usually to set a closed anti-seepage water-proof curtain on the periphery of the retaining structure as a lateral water-stop. Larger, it is difficult for the water-stop curtain to block the seepage of groundwater into the foundation pit, and the groundwater can easily bypass the bottom of the water-stop curtain and seep into the pit
However, if the bottom-type water-stop curtain is adopted, the bottom of the water-stop curtain pile needs to pass through the stratum containing coral debris to enter the relatively impermeable layer below, and the required length of the water-stop curtain pile is very long, and the cost of enclosure is uneconomical

Method used

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  • Ultrathick coral chip-contained stratum foundation pit water stop structure and method
  • Ultrathick coral chip-contained stratum foundation pit water stop structure and method
  • Ultrathick coral chip-contained stratum foundation pit water stop structure and method

Examples

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Embodiment 1

[0041] see figure 1 , and see in conjunction with Figure 2 to Figure 7 , this embodiment discloses a super-thick coral-debris-containing stratum foundation pit water-stopping structure, which is applied to the island area. The island area has an ultra-thick coral-debris-containing stratum. The coral clast-bearing sand layer 2 located below the soil layer 1, the ultra-thick coral clast-bearing formation has the characteristics described in the background art. The super-thick foundation pit water-stopping structure containing coral debris includes three-axis mixing pile water-stopping curtains for lateral water-stopping arranged around the foundation pit 3, and water-stopping curtains for bottom water-stopping arranged at the bottom of the foundation pit The full reinforcement structure 4 in the three-axis mixing pile pit, and the high-pressure rotary spraying pile 5 arranged between the water-stop curtain 3 of the three-axis mixing pile and the full reinforcement structure 4 in...

Embodiment 2

[0047] This embodiment discloses a water-stopping method for foundation pits in super-thick coral-debris-containing strata. The water-stopping structure for foundation pits in super-thick coral-debris-containing strata as described in Embodiment 1 is adopted. The method includes the following steps:

[0048] The first step is to construct a three-axis mixing pile water-stop curtain 3 for lateral water-stop around the foundation pit;

[0049] The second step is to construct a three-axis mixing pile reinforcement structure 4 at the bottom of the foundation pit to stop water at the bottom of the pit;

[0050] In the third step, the high-pressure rotary grouting pile 5 is driven between the water-stop curtain 3 of the three-axis mixing pile and the reinforcement structure 4 in the three-axis mixing pile pit.

[0051] The water-stopping method for foundation pits in ultra-thick coral debris-containing strata provided in this example adopts a combination of lateral water-stopping an...

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Abstract

The invention provides an ultrathick coral chip-contained stratum foundation pit water stop structure and a method. The structure comprises a three-shaft stirring pile water stop curtain arranged around a foundation pit, a three-shaft stirring pile in-pit full reinforcing structure arranged at the bottom of the foundation pit, and a high-pressure jet grouting pile arranged between the three-shaft stirring pile water stop curtain and the three-shaft stirring pile in-pit full reinforcing structure; and the construction depths of the three-shaft stirring pile in-pit full reinforcing structure and the high-pressure jet grouting pile are both from the bottom of the foundation pit to the bottom end of the three-shaft stirring pile water stop curtain. A mode of combining lateral water stop with in-pit water stop is adopted; the three-shaft stirring pile water stop curtain stops underground water from entering the pit from the side part of the foundation pit; the three-shaft stirring pile in-pit full reinforcing structure in a three-shaft stirring pile pit stops the underground water from entering the pit from the bottom of the foundation pit; and the high-pressure jet grouting pile stops the underground water from entering the pit from a joint of the two to effectively solve the seepage problem of the underground water into the pit under the conditions of the type of stratum.

Description

technical field [0001] The invention relates to the field of geotechnical engineering design and construction, in particular to an ultra-thick foundation pit water-stop structure and method suitable for island areas. Background technique [0002] Corresponding to the construction of the foundation pit located in the island area, it is greatly challenged in terms of water stop. The ultra-thick coral-bearing clastic strata in the island area include the coral-bearing sand layer and the soil layer on it. The coral debris formation has the following characteristics: [0003] (1) The thickness of the soil layer is large and the permeability coefficient is large [0004] The soil layer of the strata containing coral debris is relatively thick (about 15-20m), and the permeability coefficient is relatively large (about 10 -2 cm / s). [0005] (2) The groundwater in the strata containing coral debris is rich in water and has a direct hydraulic connection with seawater [0006] The...

Claims

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Application Information

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IPC IPC(8): E02D19/12E02D19/18E02D29/16E02D5/46
CPCE02D19/12E02D5/46E02D19/18E02D29/16
Inventor 阳吉宝董林兵
Owner 上海市建工设计研究总院有限公司