Method for computing primary supporting opportunity on basis of longitudinal deformation curves of surrounding rock of tunnels

A technology of longitudinal deformation and calculation method, applied in the direction of calculation, design optimization/simulation, instrument, etc., can solve the problems of increased workload, long 3D simulation calculation time, no clear judgment principle, etc., and achieves wide applicability and strict logic. , the effect of improving the calculation accuracy

Inactive Publication Date: 2017-05-17
WUHAN UNIV
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Problems solved by technology

[0005] The existing primary support calculation methods have the following problems: (1) The primary support in the 3D numerical simulation is mostly selected based on experience, and there is no clear judgme

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  • Method for computing primary supporting opportunity on basis of longitudinal deformation curves of surrounding rock of tunnels
  • Method for computing primary supporting opportunity on basis of longitudinal deformation curves of surrounding rock of tunnels
  • Method for computing primary supporting opportunity on basis of longitudinal deformation curves of surrounding rock of tunnels

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Embodiment 1

[0072] A calculation model is established based on the T18+800.00 standard section of a water supply tunnel, in which the surrounding rock is mainly of type III, the buried depth of the tunnel is 696.6m, and the excavation diameter is 2R=5.49m. The boundary of the model is 30m away from the center of the tunnel. The axis direction is taken as 140m, normal displacement constraints are imposed on the four sides and the bottom of the model, and vertical uniform stress is applied on the upper part to simulate the upper covering effect. For details, see figure 2 , the rock mass adopts the Mohr-Coulomb yield criterion, the total number of nodes in the model is 45443, and the total number of units is 42280. Set up 4 monitoring points at the top, bottom and two waists of the section tunnel at Y=70m for details. figure 2 Distribution positions of middle monitoring points p1, p2, p3, p4. The vertical stress is simulated by the self-weight stress field, and the lateral pressure coeffi...

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Abstract

The invention discloses a method for computing primary supporting opportunity on the basis of longitudinal deformation curves of surrounding rock of tunnels. The method includes steps of 1, building three-dimensional numerical models of the tunnels, excavating the tunnels step by step according to reasonable excavation footage and recording change conditions of displacement values of typical locations of monitoring sections of the surrounding rock of the tunnels along with advancing of excavation faces; 2, establishing function relations between surrounding rock displacement completion rates of tunnel monitoring points in three-dimensional computation models and the advancing distances of the excavation faces; 3, simulating tunnel excavation by the aid of one-step excavation schemes and recording change conditions of displacement of surrounding rock monitoring points in excavation load release procedures; 4, substituting the determined surrounding rock displacement completion rates during primary supporting into surrounding rock longitudinal section deformation curve formulas obtained at the step 2 by means of fitting and computing the distances from the excavation faces to supporting application locations which are lagged behind or pulled ahead of the excavation faces during primary supporting. The method has the advantage that computation results are the distances of the supporting application locations relative to the excavation working faces and can be directly used in engineering construction sites.

Description

technical field [0001] The invention relates to the field of tunnel numerical simulation analysis, in particular to a method for calculating the timing of primary support based on the longitudinal deformation curve of surrounding rock. Background technique [0002] With the development of rock theory and numerical simulation methods, more and more numerical simulations are being used for research and analysis of tunnel excavation. Under normal circumstances, the rock mass is affected by various natural stresses and construction methods and techniques, and the surrounding rock is easily damaged during tunnel excavation. According to the literature, most tunnel accidents occur within a short period of time after excavation. At this time, the surrounding rock mainly depends on self-supporting capacity and primary support to ensure its stability, so the primary support is very important. However, according to the theory of the New Austrian Method, if the support is too early, t...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 苏凯张妍珺伍鹤皋石长征
Owner WUHAN UNIV
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