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Construction method for inhibiting frost heaving and thaw collapse of horizontally frozen end through cement-soil reinforcement method

A frost heaving and thawing settlement and construction method technology, which is applied in soil protection, infrastructure engineering, construction, etc., can solve the problems of cement consumption, manpower, machinery cost increase, construction period delay, repetitive waste, etc., to reduce construction range, reduce construction time, and reduce the effect of mixing ratio

Active Publication Date: 2014-08-13
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But using both at the same time will cause a lot of repetitive waste
The amount of cement and the cost of manpower and machinery have greatly increased, and objectively caused delays in the construction period

Method used

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  • Construction method for inhibiting frost heaving and thaw collapse of horizontally frozen end through cement-soil reinforcement method
  • Construction method for inhibiting frost heaving and thaw collapse of horizontally frozen end through cement-soil reinforcement method

Examples

Experimental program
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Effect test

Embodiment 1

[0033] A bid section in the Dongfengjing section of the railway station of Suzhou Rail Transit Line 2, with a three-story underground structure. The geology where it is located is plain fill soil, clay layer, silty clay layer, silt, silt sand layer, silty clay layer from top to bottom from the ground 1, and the stratum that the shield tunnels through is mainly silty clay layer. The project uses deep cement mixing piles combined with horizontal freezing method to strengthen the soil at the end of the shield. Cement-soil reinforcement area 3 has a bottom surface depth of 16m, a top surface depth of 3.5m, a length of 11m along the central axis of the underground tunnel, and a length of 11.7m horizontally and vertically along the central axis.

[0034] A construction method for suppressing horizontal freezing, frost heaving and thawing settlement by cement-soil reinforcement method, and the construction steps are as follows:

[0035] 1. Construction preparation, leveling the cons...

Embodiment 2

[0049] A Komatsu shield machine is used for excavation construction in a tender section of Nanjing Metro Line 3. The total length of the shield machine is 9.33m, the outer diameter of the tunnel is 6.2m, and the diameter of the portal is 6.7m. The formation within the reinforcement range of the starting end starts from the ground 1, and from top to bottom is silty clay, silt-sand interlayer, and silt-fine sand. The silty clay and silt-sand interaction layer has weak water permeability, and the permeability coefficient of the silt-fine sand layer is 10-3cm / s, which belongs to the water-permeable formation, and the groundwater has weak pressure resistance. The strata within the tunnel body are silt and fine sand, and the center of the tunnel door is buried at a depth of 18.98m. Both the entry and exit holes are reinforced with horizontal freezing. The depth of the bottom surface of the cement-soil reinforcement area 3 is 25m, the depth of the top surface is 12m, the length alon...

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Abstract

The invention relates to a construction method for subway shield tunnel end reinforcement, in particular to a construction method for inhibiting frost heaving and thaw collapse of a horizontally frozen end through a cement-soil reinforcement method. By using a cement deep mixing pile process to mix a certain quantity of cement paste in a soil body, the physical and mechanical properties of the soil body are improved, and the influences of frost heaving and thaw collapse on surrounding stratums and buildings during horizontal freezing reinforcement of the end can be inhibited. By using the construction method, the settlement of the stratums can be controlled to be negative 8mm and the upheaval can be controlled to be within 5mm. The construction method is mainly based on a manual freezing method and uses the cement-soil reinforcement method as a means for inhibiting frost heaving and thaw collapse. Compared with the traditional manual freezing method which is adopted after cement-soil foundation reinforcement is failed, on the premise that the bearing capacity and the waterproof performance of the stratums are guaranteed, the construction range and the mixing ratio of cement-soil reinforcement are further reduced, the quantity of the used cement is effectively reduced, the time is greatly saved, and the labor cost and the equipment cost are saved.

Description

technical field [0001] The invention relates to a construction method for reinforcing the end of a subway shield tunnel, and in particular relates to a construction method for suppressing horizontal freezing, frost heaving and thawing settlement by using a cement-soil reinforcement method. This construction method improves the physical and mechanical properties of the soil by adding a certain amount of cement slurry into the soil, which can inhibit the impact of frost heaving and thawing on the surrounding strata and buildings (structures) when the end is frozen and reinforced horizontally. Background technique [0002] Domestic subway tunnels are now mostly constructed using the shield method. The entry and exit holes of the shield machine are the key risk points in the construction of subway tunnels, and the reinforcement work at the end of the tunnel is the key. Both the artificial freezing method and the cement soil foundation reinforcement method are commonly used in en...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D3/12E02D3/115
Inventor 杨平张翔宇张婷鲍俊安何文龙
Owner NANJING FORESTRY UNIV
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