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Tunnel grouting process in salt rock stratum

A technology for grouting and tunneling, which is applied in tunnels, tunnel linings, underground chambers, etc., and can solve problems such as grouting technology, inability to refer to grouting technology, and large differences in salt rock formation characteristics

Active Publication Date: 2020-08-25
中铁二局第二工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] According to research, there are currently no cases of tunnels passing through salt rock strata at home and abroad. The only similar environments are tunnels passing through sulfate strata and cross-sea tunnels, but the characteristics of salt rock strata are quite different from those of salt rock strata. The total salinity based on the composition can reach 94524mg / L, far exceeding the chloride ion (Cl - ) content, and at the same time, grouting in salt rock formations must prevent the grout itself from dissolving the salt rock, so the grouting process cannot refer to the conventional tunnel grouting process

Method used

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  • Tunnel grouting process in salt rock stratum
  • Tunnel grouting process in salt rock stratum
  • Tunnel grouting process in salt rock stratum

Examples

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Comparison scheme
Effect test

Embodiment 1

[0034] The Laos section of the Friendship Tunnel of the China-Laos Railway ZLZQ-1 has a total length of 2425m, and has two work areas, the exit and the 3# inclined shaft. The construction started in March 2017. At present, the excavation length of the upper step in the export work area is 1100m, and the lining is 800m completed. The step in the 3# inclined shaft work area is excavated to DK0+890 in the long-distance direction, and the length is about 300mm. The working face is currently in a state of suspension; The steps are excavated in the direction of Xiaolijie to DK0+496.4, with a length of about 204m. In April 2018, after the 3# inclined shaft work area entered the hole, it was constructed in the direction of the large and small mileage. After May, it was found that the salt content of the surrounding rock continued to increase. On-site inspection found that the DK0+550~+890 section is a salt rock formation. The salt content gradually increased to DK0+550, and the highes...

Embodiment 2

[0039] The situation of the tunnel in this embodiment is the same as that in Embodiment 1.

[0040] This embodiment provides a tunnel grouting process in salt rock formation, which is used for grouting and water plugging after excavation of DK0+000~DK0+356 and DK0+850~DK1+530. The details are as follows: (1) Grout hole arrangement: grouting holes are drilled around the tunnel, and anti-corrosion grouting pipes are installed; (2) grout configuration: common cement slurry and superfine cement slurry are prepared with brine, of which the water-cement ratio of normal cement slurry is 0.8, and the superfine cement slurry The water-cement ratio of cement is 0.6, and the concentration of brine is 10-21%; (3) Grouting: When the groundwater volume is strand-like water or above, pour ordinary cement slurry and superfine cement slurry in sequence; When dripping water and below, pour ultra-fine cement slurry.

[0041] figure 2 It is the effect diagram of water blocking when the groundw...

Embodiment 3

[0043] The situation of the tunnel in this embodiment is the same as that in Embodiment 1.

[0044] This embodiment provides a tunnel grouting process in salt rock formation, which is used for grouting and water plugging after excavation of DK0+000~DK0+356 and DK0+850~DK1+530. The details are as follows: (1) Layout of grouting holes: grouting holes are drilled around the tunnel, and anti-corrosion grouting pipes are installed; (2) grout configuration: common cement slurry and superfine cement slurry are prepared with brine, of which the water-cement ratio of normal cement slurry is 0.6, and superfine cement slurry The water-cement ratio of cement is 0.5, and the concentration of brine is 10-21%; (3) Grouting: When the groundwater volume is strand-like water and above, pour ordinary cement slurry and superfine cement slurry in sequence; When dripping water and below, pour ultra-fine cement slurry.

[0045] image 3 It is the effect diagram of water blocking when the groundwat...

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Abstract

The invention belongs to the technical field of tunnel waterproofness and impermeability, and provides a tunnel grouting process in a salt rock stratum. The tunnel grouting process in the salt rock stratum comprises the steps that grouting holes are formed, specifically, the grouting holes are formed in the periphery of a tunnel hole, and anti-corrosion grouting pipes are embedded; slurry is prepared, specifically, ordinary cement slurry and ultra-fine cement slurry are prepared with brine of certain concentration; the slurry is grouted, specifically, when the underground water volume is linear strand water or above, the ordinary cement slurry and the ultra-fine cement slurry are sequentially grouted; and when the underground water volume is drip water or below, the ultra-fine cement slurry is grouted. According to the tunnel grouting process, salt rocks are not dissolved in the grouting process, meanwhile the surrounding rock cracks can be effectively blocked, an effective sealing ring can be formed, the salt rock is prevented from being dissolved by underground water, and the intrusion of underground salt water into the tunnel structure is prevented.

Description

technical field [0001] The invention belongs to the technical field of tunnel waterproofing and anti-seepage, and in particular relates to a grouting process for tunnels in salt rock formations. Background technique [0002] The Friendship Tunnel on the China-Laos Railway crosses the discontinuous rock-salt stratum with special geological conditions. It is rare at home and abroad, and there is no similar engineering case. The halite has strong solubility, strong corrosion and expansion, and has the following adverse effects on the tunnel structure: (1) The steel bar is easily mixed with the Cl in the NaCl solution - The reaction will cause steel bar corrosion, weaken the performance of the steel bar, and the volume of the rust material will increase compared with the original steel bar, which will further expand the crack of the concrete; (2) NaCl solution may penetrate into the crack and recrystallize and produce volume expansion. It will aggravate the cracking of the conc...

Claims

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Application Information

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IPC IPC(8): E21D11/38E21D11/10C04B28/00
CPCE21D11/38E21D11/10C04B28/00C04B2111/70C04B22/124
Inventor 杨世忠李银平杨龙伟蔡峰魏远洋周义程李锋刚杨雷辜文凯吴华舒俊良罗仁立刘志韬
Owner 中铁二局第二工程有限公司
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