A Deformation Control Method of Tunnel Surrounding Rock Applied to Granite Alteration Zone Under Seepage Conditions

A technology of surrounding rock deformation and control method, which is applied in the direction of tunnels, earthwork drilling, mining equipment, etc., can solve the problems of overall instability of excavation surface, increase of tunnel construction cost, multiple changes of support schemes, etc., and achieve economical support cost effect

Active Publication Date: 2021-07-09
CHINA RAILWAY ERYUAN ENG GRP CO LTD
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Problems solved by technology

In addition, the granite intruded into the alteration zone in the later period, affected by multiple tectonic actions and magma intrusion, the joints and fissures of the rock mass developed, the rock mass was broken, and the rock mass was mostly loose gravel breccia and silt soil, with extremely poor stability
At the same time, the rock mass in the alteration zone has the characteristics of high sand content and large void ratio. Under the action of high dynamic water pressure, it is very easy to see seepage damage phenomena such as piping and flowing soil, which will cause the overall instability of the excavation surface.
[0003] Under the existing seepage conditions, the tunnel construction in the granite alteration zone adopts a single control method for groundwater drainage. During the excavation process, the mechanical properties of the granite alteration zone are easy to deteriorate. The construction design often differs from the actual situation, and many changes are often required. Design of support scheme, affecting construction efficiency and increasing tunnel construction cost

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  • A Deformation Control Method of Tunnel Surrounding Rock Applied to Granite Alteration Zone Under Seepage Conditions
  • A Deformation Control Method of Tunnel Surrounding Rock Applied to Granite Alteration Zone Under Seepage Conditions
  • A Deformation Control Method of Tunnel Surrounding Rock Applied to Granite Alteration Zone Under Seepage Conditions

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Embodiment

[0032] Qingshui Tunnel is located in the Anping-Nuodong section from Hongtang to Cenxi section of the Luo (Yang) Zhan (Jiang) Railway. The entrance mileage is DK439+346, the exit mileage is DK442+782, and the total length is 3436m. It is the control project of the Yongcen section of the Luozhan Railway. one.

[0033] The strata of the underlying bedrock of the tunnel are mixed in sequence, and the underlying bedrock is late Yanshanian granite and middle Ordovician Suoweiling Group sandstone interbedded with shale, limestone and marble formed by hydrothermal alteration. Among them, the granite is strongly weathered and varied, the rock mass is broken, the fully weathered layer is 35-80m thick, the rock core is soil columnar, silt-like, and spherical weathered bodies can be seen locally, which belongs to the granite alteration zone mentioned in this patent.

[0034] Section DK442+633~+782 crosses a long flowing gully and is located in the low and gentle area at the foot of the m...

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Abstract

A method for controlling the deformation of surrounding rock of a tunnel in a granite alteration zone under seepage conditions, comprising the following steps: ① setting a grouting conduit in the surrounding rock along the excavation surface of the tunnel and within a certain range outside the tunnel outline; Internally press the grouting material; ③ After the grouting material solidifies and hardens, block the cracks in the surrounding rock; ④ Set a monitoring cross-section in the middle of the proposed excavation section, and measure the surrounding rock stress, pore water pressure and displacement deformation at three key points. Monitoring parameters, obtaining the dynamic change curve of each monitoring parameter, and then fitting the relevant theoretical model of each monitoring parameter; ⑤Simulating the excavation process; ⑥Simulating the influence of curtain grouting advance support control method on the stability and safety factor of surrounding rock; ⑦Analyze the deformation diagram of the surrounding rock, the distribution diagram of the yield zone, and the cloud diagram of the maximum principal stress and the minimum principal stress of the hematite slab, and obtain the optimal design value of the thickness of the hematite slab that can control the deformation of this type of surrounding rock.

Description

technical field [0001] The invention relates to tunnel engineering, in particular to a method for controlling deformation of tunnel surrounding rock applied to a granite alteration zone under seepage conditions. Background technique [0002] Due to its special diagenetic process and evolution process, the rock mass in the granite alteration zone has special mechanical properties such as low strength, water swelling and strain softening. Insufficient understanding of the distribution laws and engineering characteristics of granite alteration zone rock mass often brings great difficulties to engineering design and construction. In actual tunnel engineering, the seepage of groundwater and the strain softening characteristics of surrounding rock materials are the most important factors affecting tunnel deformation. The body strength is low, and the montmorillonite in the montmorillonized altered rock has the characteristics of water absorption and swelling, which can loosen and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D9/00E21D9/10
CPCE21D9/001E21D9/10
Inventor 岳志勤
Owner CHINA RAILWAY ERYUAN ENG GRP CO LTD
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