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Three-step non-reserved-core-soil construction method for large-cross-section tunnel at collapsible loess area

A technology of collapsible loess and reserved core soil, which is applied in tunnels, tunnel linings, earthwork drilling and mining, etc. It can solve the problems of frequent surrounding rock disturbances, slow construction progress, and long construction time, and shorten the excavation construction time, increase construction progress, and high construction efficiency

Inactive Publication Date: 2016-12-07
CHINA RAILWAY CONSTR BRIDGE ENG BUREAU GRP OF THE FIFTH ENG +1
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AI Technical Summary

Problems solved by technology

During the construction process, it was found that the construction of the double-side-wall pilot pit method has more disturbances to the surrounding rock, and the overall construction time of the arch frame forming a ring is longer. Manual or small-scale machine construction must be used during the construction of the side pilot tunnel. Unable to carry out construction, the construction progress is slow, and the cost is high

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  • Three-step non-reserved-core-soil construction method for large-cross-section tunnel at collapsible loess area
  • Three-step non-reserved-core-soil construction method for large-cross-section tunnel at collapsible loess area
  • Three-step non-reserved-core-soil construction method for large-cross-section tunnel at collapsible loess area

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Embodiment

[0030] Example: The tunnel is one-way, two-lane, and the total length of the tunnel is 2550m. The standard section span of the tunnel is 12.46m, the height is 9.84m, and the excavation volume is 109.9m 3 , the span of the widening section is 14.68m, the height is 11.3m, and the excavation area is 129.7m 2 , for large-section tunnels. The surrounding rock of the tunnel is mainly Quaternary aeolian new loess with a water content of 12.76-14.56, which is a typical collapsible loess rock formation.

[0031] First, the construction process: such as figure 1 shown.

[0032] Step S01: Construction preparation: establish a comprehensive forecasting system, use geological method, engineering geological analogy method, and geological sketch method for macroscopic analysis and forecasting, use geological radar and advanced sounding for revealing verification forecasting, and reveal formation lithology, The degree of development of the structural plane of the rock mass, the size of th...

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Abstract

The invention discloses a three-step non-reserved-core-soil construction method for a large-cross-section tunnel at a collapsible loess area, and relates to the technical field of tunnel construction. During upper step excavation construction, reserved core soil of an upper parenthetic pilot tunnel is omitted, so that the upper step excavation quantity is made to account for 73% of the excavation area of a whole tunnel face; the one-time excavation area is large, deslagging efficiency is improved, machine and labor force service efficiency is improved, the tunnel face excavation and construction time is shortened, the sealing time of structural steel in a tunnel hole is shortened correspondingly, and the tunnel hole support safety coefficient is increased; and the construction progress is greatly accelerated, the construction cost is lowered, and good economic and social benefits can be achieved.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a three-step construction method for large-section tunnels in collapsible loess areas without reserved core soil. Background technique [0002] At present, the CD method, CRD method, and double-side-wall pilot-pit method are mainly used in the construction process of tunnels in soft ground in my country. Although these construction methods can better control the deformation and convergence of the surrounding rock in the tunnel, the process is complicated and the construction progress is slow. Slow and expensive. The Dingxi Tunnel of Tianding Expressway is a large-section tunnel in a collapsible loess area. The collapsible loess stratum is characterized by joints that are more developed than the large pores in the soil, which softens when exposed to water, shrinks and cracks, is easy to weather, has poor diagenesis, and has collapsibility. property, the stability of th...

Claims

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Application Information

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IPC IPC(8): E21D9/04E21D11/00E21D20/00F42D3/00
CPCE21D9/04E21D9/003E21D9/006E21D11/003E21D20/00
Inventor 苏春生梁朋刚何十美汤振亚
Owner CHINA RAILWAY CONSTR BRIDGE ENG BUREAU GRP OF THE FIFTH ENG
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