Construction method for tunnel trunk penetrating through loess interface water-rich strata

A construction method and technology of water-rich strata, which is applied in tunnels, tunnel linings, earthwork drilling and mining, etc., can solve problems such as low construction efficiency, sudden surge of sand layers on the tunnel face, and increased construction costs, so as to improve construction efficiency and prevent The effect of sand bursting and reducing construction cost

Inactive Publication Date: 2016-11-16
CHINA RAILWAY NO 2 ENG GRP CO LTD +1
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  • Application Information

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Problems solved by technology

[0003] The body of the loess tunnel passes through the weak stratum at the interface between the water-rich sand layer and the clayey loess, especially the water-saturated zone formed between the water-rich sandy loess layer and the impermeable cement rock stratum. Water, outbursts, collapse and instability of the tunnel face, overall subsidence and deformation lead to problems such as encroachment. The traditional construction method uses the three-step excavation method, but the three-ste...

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  • Construction method for tunnel trunk penetrating through loess interface water-rich strata
  • Construction method for tunnel trunk penetrating through loess interface water-rich strata
  • Construction method for tunnel trunk penetrating through loess interface water-rich strata

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Embodiment 1

[0045] This embodiment is applied to the construction process of the large-section tunnel body passing through the water-rich stratum at the loess interface.

[0046] Such as figure 1 As shown, the construction method of the tunnel body passing through the water-rich stratum at the loess interface adopts the following steps:

[0047] Step a: Investigate and analyze the geological conditions of the tunnel body passing through, systematically analyze the geological survey data, mark the positions of valleys and caves under the large-section loess tunnel body on the design drawings, and conduct field surface investigation and analysis along the corresponding surface of the tunnel , and mark special parts such as shallow burials, grooves and pits without exploration data on the drawings. Then use geological drilling rigs to drill holes on the dense surface of special parts without exploration data. The drilling depth is at least 10m below the bottom of the tunnel, and the transit...

Embodiment 2

[0066] This embodiment is applied to the occasion where the tunnel body passes through the loess interface stratum, and at the same time, it is necessary to inject grouting ahead of the curtain at the arch of the tunnel body.

[0067] The overall steps of this embodiment are the same as those of Embodiment 1, the difference is that in step c of embodiment 1, when it is necessary to use advanced deep hole curtain grouting according to the stability of the tunnel face, it is necessary to perform grouting in step c Add multiple steps between step d.

[0068]In step c of Example 1, a targeted plan is formulated according to the stability of the tunnel face to determine whether to use advanced deep hole curtain grouting, and to detect the hydrology of the loess stratum based on the tunnel geological survey data combined with the face and advanced drilling According to the geological data, a targeted advanced grouting and excavation plan is formulated. The tunnel body passes through...

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Abstract

The invention relates to the technical field of tunnel construction, in particular to a construction method for a tunnel trunk penetrating through loess interface water-rich strata. The construction method comprises the following steps that (1) the geological condition of the strata where the tunnel truck passes is surveyed and analyzed, and the geological condition in front of a tunnel face is analyzed at the same time; (2) whether advance longhole curtain grouting is adopted or not is determined according to the stability situation of the tunnel face; (3) advance supporting is conducted, and excavation and supporting are conducted by means of a four-step and temporary cross bracing method; and (4) excavation, supporting and lining building are conducted on an inverted arch of a tunnel. According to the construction method for the tunnel trunk penetrating through the loess interface water-rich strata, the geologic structure of a loess interface is analyzed, and advance grouting and the four-step and temporary cross bracing method are adopted for the interface water-rich strata, so that mud bursting of the tunnel face in the water-rich interface strata is effectively suppressed, and conditions are created for excavation; and the four-step and temporary cross bracing method effectively prevents overlarge overall sinking and deformation damage of the tunnel trunk when the tunnel truck penetrates through the loess interface water-rich strata, and the construction method has very important guiding significance for design and construction of tunneling in loess-like strata.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a construction method for a tunnel body passing through a water-rich stratum at a loess interface. Background technique [0002] In recent years, my country's infrastructure construction has developed rapidly. With the acceleration of domestic high-speed railway and western development, a large number of railways and roads have been built in Gansu, Shanxi, Shaanxi, Inner Mongolia, Qinghai and other provinces and cities in recent years. The soil-like deposits formed during the 19th century, so its properties are relatively loose and special. The typical loess is composed of yellow-gray or brown-yellow dust and fine silt particles. Or loess nodules, porous, with significant vertical joints, no bedding, hard when dry, easy to be soaked by running water, usually easy to peel off and suffer from erosion, and even collapse. Therefore, when carrying out various engineering...

Claims

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Application Information

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IPC IPC(8): E21D9/04E21D9/00E21D11/10
CPCE21D9/04E21D9/001E21D11/10
Inventor 刘泽刘彬蒲晓容李文学何开伟
Owner CHINA RAILWAY NO 2 ENG GRP CO LTD
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