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154results about How to "Ensure support" patented technology

Soft rock tunnel deformation control method based on anchor rod force analysis

The invention discloses a soft rock tunnel deformation control method based on anchor rod force analysis. A soft rock tunnel is excavated and subjected to deformation control construction from back to front according to multiple segments, and when any segment is excavated and subjected to deformation control construction, the method includes the steps that 1, surrounding rock basic mechanical parameters are determined; 2, the tunnel reserved excavated volume is determined; 3, the tunnel is excavated; 4, a tunnel preliminary bracing structure is determined; 5, tunnel deformation control construction is carried out, wherein in the tunnel preliminary bracing construction process, a flexible mold bracing structure is constructed from back to front; 6, a next segment is excavated and subjected to deformation control construction; 7, the step 6 is repeated multiple times till the full excavation and deformation control construction process of the soft rock tunnel is completed. The soft rock tunnel deformation control method is reasonable in design, convenient to achieve and good in use effect, the reserved excavated volume is determined according to the surrounding rock deformation condition of the soft rock tunnel, the flexible mold bracing structure is adopted for carrying out full-section bracing on the tunnel, the flexible mold bracing structure and the tunnel preliminary bracing structure are in coordination deformation, and deformation of the soft rock tunnel can be effectively controlled.
Owner:XIAN UNIV OF SCI & TECH

Excavation and preliminary bracing method for soft rock tunnel

The invention discloses an excavation and preliminary bracing method for a soft rock tunnel. The excavation and preliminary bracing construction for the soft rock tunnel are performed in sections from back to front. When any section is subjected to excavation and preliminary bracing construction, the method comprises the following steps: 1) confirming basic mechanical parameters of the surrounding rock; 2) confirming the reserved excavated volume of the tunnel: confirming the reserved excavated volume of the currently constructed section according to a theoretical value of inward displacement of the surrounding rock of the soft rock tunnel after being braced; 3) excavating the tunnel; 4) confirming a preliminary bracing structure of the tunnel; 5) constructing the preliminary bracing of the tunnel; 6) performing the excavation and preliminary bracing construction of the next section; and 7) repeating the step 6) till all the processes of the excavation and preliminary bracing construction of the soft rock tunnel are completed. The method disclosed by the invention has the advantages of simple steps, reasonable design, convenience in realization and good use effect; the reserved excavated volume is confirmed according to the surrounding rock deformation condition of the soft rock tunnel; and the steel bracket and the anchoring net sprayed preliminary bracing structure are coordinated for performing all-section preliminary bracing on the tunnel.
Owner:XIAN UNIV OF SCI & TECH

Soft rock tunnel excavation method based on anchor bolt stress

The invention discloses a soft rock tunnel excavation method based on anchor bolt stress and the soft rock tunnel is excavated by a plurality of sections in a longitudinally direction of the tunnel from rear to front. The method for excavating any section of the soft rock tunnel comprises the following steps: first, determing the basic mechanical parameters of surrounding rock; second, determing the reserved excavation capacity of tunnels: determing the capacity of reserved excavation of the current construction section according to a theoretical value S of the soft rock tunnel inward displacement after the completion of supporting, the S is the sum of plastic displacement of surrounding rock in soft rock tunnel and displacement after shaping deformation of surrounding rock in soft rock tunnel; third, the tunnel is excavated; fourth, the next section is excavated; fifth, repeating step fourth until the full excavation of the soft rock tunnel is completed. The soft rock tunnel excavation method has the advantages of simple steps, reasonable design and convenient implementation, and has good effect. The excavation capacity is determined according to the deformation of the surrounding rock of the soft rock tunnel, which can solve the problem of the reserve deformation of the soft rock tunnel, avoid the problem of soft rock tunnel repair work and cost less.
Owner:XIAN UNIV OF SCI & TECH
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