Dynamic feedback adjusting shield tunneling earth pressure balance control method

A technology of dynamic feedback and pressure balance, which is applied in earthwork drilling, mining equipment, tunnels, etc.

Inactive Publication Date: 2016-09-28
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is only an empirical method. In engineering practice, there are often differences between the set soil pressure and the actual soil pressure of the formation, which will cause displacement of the surrounding strata and cause surface settlement or uplift. This is not allowed for some situations with high requirements for surface settlement.

Method used

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  • Dynamic feedback adjusting shield tunneling earth pressure balance control method
  • Dynamic feedback adjusting shield tunneling earth pressure balance control method
  • Dynamic feedback adjusting shield tunneling earth pressure balance control method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A shield construction passes through a building-intensive area. The strata that the tunnel passes through in this section are mainly fully weathered and residual soil strata, and the buried depth of the tunnel is 20m-22m.

[0034] Step 1: Determine the preset value of the soil bin

[0035] When the shield machine is constructed in this section of the stratum, in order to ensure the safety of the surface buildings, according to the stratum conditions, it is determined that the unfavorable strata that account for a large number of tunnel construction areas take into account the earth pressure.

[0036] (1) Surrounding rock is considered in terms of residual soil layer, and tunnel burial depth is considered in terms of safety. The longitudinal range of the tunnel is uniformly taken as 22m. Further, different values ​​from 20 to 22m can be selected for different sections of the tunnel;

[0037] (2) The static earth pressure coefficient can usually be 1 / 3~1 / 2, and the stat...

Embodiment 2

[0048] A shield tunnel is constructed to pass under a railway subgrade. The main strata that the tunnel crosses at this location are moderately weathered strata and strongly weathered strata. The buried depth of the tunnel is 15-20m. The difference from Example 1 is that in order to ensure the safe operation of the railway, the shield construction has higher requirements on the surface settlement, requiring that the rail surface settlement value should not exceed 10mm, and the maximum uplift should not exceed +10mm.

[0049] Step 1: Determine the preset value of the soil bin

[0050] When the shield is constructed in this section of the stratum, the pressure control of the soil bunker should be more precise due to the consideration of the limitation of the settlement within the scope of the railway passing below.

[0051] (1) The surrounding rock is considered to be strongly weathered strata. The tunnel burial depth of the shield test pushing section is 200m away from the rail...

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Abstract

The invention discloses a dynamic feedback adjusting shield tunneling earth pressure balance control method. In earth pressure balance shield tunneling construction, the water and earth pressure of an excavated formation is determined at first and is taken as a reference value of earth bin pressure after being corrected; afterwards, in the shield tunneling test pushing process, ground surface settlement is detected in real time, and data obtained through monitoring is subjected to ground surface settlement analysis; and analysis results are transmitted to a shield tunneling control system, and the earth pressure balance of the excavated face is achieved by judging and adjusting the earth bin pressure. According to the method, formation deformation caused when shield tunneling penetrating downwards through important buildings such as existing railways and building compact districts is effectively controlled, and the influence of shield tunneling construction to the ground surface is reduced.

Description

technical field [0001] The invention belongs to the field of geotechnical engineering and relates to a method for dynamic feedback adjustment of earth pressure balance control of shield tunneling Background technique [0002] In recent years, my country's urbanization process has developed rapidly. In order to alleviate the pressure of ground transportation, urban subways have been built on a large scale. As a construction method for tunnel construction, the shield method has obvious advantages over other construction methods, so it is widely used in urban subway tunnel projects. [0003] The earth pressure balance shield method is more commonly used in shield tunneling construction. Its principle is to use the cutter head to rotate and cut the soil on the excavation surface. The soil silo is discharged by using the screw conveyor whose end extends into the lower part of the silo; by controlling the speed of the screw conveyor or the propulsion speed of the shield, the dyna...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/093
Inventor 季昌周顺华周瑜亮肖军华程茜
Owner TONGJI UNIV
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