Method for estimating tunneling rock mass strength of TBM (Tunnel Boring Machine) and performing graded early warning

A technology for rock mass strength and rock excavation, which is applied in the field of TBM tunnel construction, can solve the problems that the rock strength measurement model is not suitable for jointed rock mass, and the tunnel surrounding rock classification method is not suitable for TBM construction, etc., and achieves easy online acquisition and classification indicators. Parameter simple effect

Pending Publication Date: 2022-05-27
SHIJIAZHUANG TIEDAO UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for estimating the strength of TBM excavated rock mass and grading early warning, aiming to solve the limitation that the rock strength measurement model based on

Method used

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  • Method for estimating tunneling rock mass strength of TBM (Tunnel Boring Machine) and performing graded early warning
  • Method for estimating tunneling rock mass strength of TBM (Tunnel Boring Machine) and performing graded early warning
  • Method for estimating tunneling rock mass strength of TBM (Tunnel Boring Machine) and performing graded early warning

Examples

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example 1

[0082] Example 1: Stake section of a water diversion project of a reservoir in Zhejiang: 15+916~15+716(200m)

[0083] Lithology: Breccia fused tuff

[0084] Average compressive strength: 145MPa

[0085] On-site classification of surrounding rock in the tunnel section: Class II

[0086] Actual rock mass conditions: joints and fissures are not well developed on the excavation surface, the structural surface is mainly closed, and the flatness of the cave wall is good; the surrounding rock integrity is good; there is no water seepage; The surrounding rock of pile numbers 15+870~15+760 and 15+732~15+726 is partially broken.

[0087] Supporting method: no support; mesh support at local broken parts, plain sprayed concrete.

[0088] from Figure 4 It can be seen that the thrust is basically maintained at 7000kN, the penetration range is 0.5~8mm / r, and the change is large. The equivalent strength of the rock mass estimated based on formula (3) ranges from 50MPa to 250MPa, with an...

example 2

[0091] Stake section of a water diversion project in Guangzhou: 23+847~23+716 (131m)

[0092] Lithology: Granite

[0093] Average rock strength: 118MPa

[0094] On-site classification of surrounding rock in the tunnel section:

[0095] 23+847~23+765(82m): Class II

[0096] 23+765~23+743(22m): Class III

[0097] 23+743~23+716(27m): Class II

[0098] Actual rock mass conditions:

[0099] 23+847~23+765 and 23+743~23+716: rock is hard; joints and fissures are not developed on the excavation face, and the rock mass is complete to relatively complete; the surrounding rock is basically stable; the excavation face is dry.

[0100] 23+765~23+743: Hard rock; well developed joints and fissures on the excavation face, poor integrity of the rock mass; weakly differentiated surrounding rock, poor local stability; a small amount of water dripping locally.

[0101] Support method:

[0102] 23+847~23+765, 23+743~23+716: not supported

[0103] 23+765~23+743: System bolts with reinforcem...

example 3

[0105] Example 3: Stake section of a TBM water diversion project in Xinjiang: 51+887~51+700 (187m)

[0106] Lithology: tuffaceous sandstone

[0107] Average rock strength: 100MPa

[0108] On-site classification of surrounding rock in the tunnel section: Class II

[0109] Actual rock mass conditions: cracks on the excavation face are not developed and dry; the rock mass is complete

[0110] Support method: no support.

[0111] Select the complete hole section data of class II for analysis, from Image 6 It can be seen that the thrust of this tunnel section is basically maintained at 17000kN, and the average penetration is 8.58mm / r. The calculation shows that the FPI range is 20-50, and the TBM tunneling performance is good. The equivalent strength and integrity coefficient of the rock mass obtained by using the model described in formula (1) in the present invention are relatively high, and the equivalent strength of the rock mass is basically maintained at 50-130 MPa, with...

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Abstract

The invention discloses a method for estimating the tunneling rock mass strength of a TBM and performing graded early warning, and belongs to the technical field of TBM tunnel construction.The method comprises the following steps that a general relation model of the TBM tunneling rock mass equivalent strength Rec and the penetration index FPI is established; the model is applied to TBM tunneling construction, according to tunneling parameters collected by a TBM in real time, the integrity coefficient Kv of the TBM in a tunneling rock mass is estimated in real time, and according to the given grading standard and early warning value, grading and early warning are conducted on the TBM in the tunneling rock mass. According to TBM tunneling parameter changes, the equivalent strength and the integrity coefficient of the TBM in the tunneling rock mass are estimated online, and the tunnability and the crushing degree of the TBM in the tunneling rock mass are analyzed in real time; compared with a traditional TBM construction surrounding rock grading method, the method has the advantages that adopted grading index parameters are simple and easy to obtain online, and the method is of great importance to timely judgment of surrounding rock tunneling performance, early warning of the risk that the TBM is stuck due to rock collapse and preparation of proper supporting measures in advance.

Description

technical field [0001] The invention belongs to the technical field of TBM tunnel construction, and in particular relates to a method for estimating the strength of a TBM excavating rock mass and giving early warning in grades. Background technique [0002] Rock strength and rock mass integrity, as important parameters to characterize rock mass quality characteristics, are the main judgment basis for engineering rock mass quality classification, and are also important evaluation indicators for TBM tunneling performance. A quick and accurate judgment is essential. However, due to the limitation of mechanical structures such as cutterheads and shields, TBM cannot directly observe the surrounding rock on the face during the excavation process, and it is difficult to quickly conduct field tests and evaluations on the quality characteristics of surrounding rock. At present, the traditional rock strength test method and rock mass integrity coefficient acquisition method are all o...

Claims

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Application Information

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IPC IPC(8): G06F30/13G06F30/20G06Q10/06G06F119/14
CPCG06F30/13G06F30/20G06Q10/06393G06F2119/14E21F17/18E21D9/003E21D9/087G01V99/005E21F17/185
Inventor 李青蔚杜立杰杨亚磊石泉赵向波全永威
Owner SHIJIAZHUANG TIEDAO UNIV
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