Red bed sand shale tunnel large deformation section construction method

A construction method and technology of large deformation, applied in the direction of tunnel, tunnel lining, earthwork drilling and mining, etc., can solve the problems of landslide, weakening of interlayer bonding force, easy softening, etc.

Inactive Publication Date: 2019-10-01
中铁二院(成都)建设发展有限责任公司
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Problems solved by technology

[0003] The "red layer" is mainly composed of mudstone and fine sandstone. Its special features are: the mudstone is soft, weak in weathering resistance, easy to soften when exposed to water, and its strength is obviously reduced after contact with water. The bonding force

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  • Red bed sand shale tunnel large deformation section construction method
  • Red bed sand shale tunnel large deformation section construction method
  • Red bed sand shale tunnel large deformation section construction method

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0026] refer to Figure 1 to Figure 5 , the large deformation section construction method of the red bed sand mudstone tunnel of the present invention comprises the following steps:

[0027] (1) Carry out the large deformation section test according to the monitoring and measurement situation and the deformation of the constructed section, increase the amount of reserved deformation, adjust the support parameters to strengthen the initial support, and adjust according to the sinking of the vault, horizontal displacement and deformation of the inverted arch The rise-span ratio of the excavation section determines the excavation section of the large deformation section;

[0028] (2) Implement the advance support 1 of the arch, as the excavation support system, increase the amount of reserved deformation to release the stress of the surrounding rock, and ...

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Abstract

The invention discloses a red bed sand shale tunnel large deformation section construction method to effectively avoid large deformation and collapse during the construction period, lower the construction period delaying risk and improve the construction efficiency. According to the monitoring measurement condition and the deformation condition of the constructed section, the large deformation section is tested, the reserved deformation is enlarged, and the support parameter is adjusted to reinforce preliminary bracing; the rise span ratio of an excavated section is adjusted according to crownsettlement, horizontal displacement and inverted arch deformation condition, and the excavated section of the large deformation section is determined; the rise span ratio is adjusted to be about 0.5;when the horizontal displacement value is larger, the crown settlement value is smaller relative to the horizontal displacement value and inverted arch deformation is not generated, the excavated section of the large deformation section is determined to be semi-circular; and when the crown settlement value, horizontal displacement value and inverted arch deformation upheaval value are larger, theexcavated section of the large deformation section is determined to be circular.

Description

technical field [0001] The invention relates to a tunnel, in particular to a construction method for a large-deformation section of a red-bed sand-mudstone tunnel passing through the mudstone interbedded with sandstone in western Yunnan. Background technique [0002] The Hengduan Mountains in Southwest my country have complex strata and well-developed structures. Among them, the Mesozoic Jurassic Bazhulu Formation mudstone interbedded with sandstone, purplish red, light purplish red, partially gray-white quartz, gypsum, argillaceous structure, and thin-layered structure. The rock mass is extremely broken and extremely poor in stability. The rock mass is breccia-like and soil-like, and the rock layer is smooth. Because it is mainly red, it is commonly known as the "red layer", and its thickness ranges from hundreds of meters to thousands of meters. [0003] The "red layer" is mainly composed of mudstone and fine sandstone. Its special features are: the mudstone is soft, weak ...

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Application Information

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IPC IPC(8): E21D11/18E21D20/00
CPCE21D11/003E21D11/18E21D20/00
Inventor 米涛李井元胡安华何万阳伍志华迟学新伍春晖傅军申冯赖航吴慧林
Owner 中铁二院(成都)建设发展有限责任公司
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