Jacket material used for controllable grouting of shield tunnel underwater karst, and preparation method thereof

A technology of shield tunneling and preparation method, applied in the field of geotechnical engineering foundation treatment grouting, can solve the problems of poor longitudinal sealing effect, difficult setting time of casing, difficult control of axial diffusion, etc., and achieves adjustable strength and condensation. The time can be adjusted to improve the effect of anti-seepage reinforcement

Active Publication Date: 2017-03-22
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a shell material for controllable grouting in underwater karst of shield tunnel and its preparation method, so as to solve

Method used

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  • Jacket material used for controllable grouting of shield tunnel underwater karst, and preparation method thereof
  • Jacket material used for controllable grouting of shield tunnel underwater karst, and preparation method thereof
  • Jacket material used for controllable grouting of shield tunnel underwater karst, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example

[0033] Examples 1-16:

[0034] The casing materials of Examples 1-16 are mainly composed of clay syrup, cement, water and fly ash. The specific gravity of the clay syrup is controlled between 1.20 and 1.35, and the mass ratio of cement and fly ash is 1:1 to 1.5. :1. The raw material ratios of the casing materials of Examples 1-16 are shown in Table 1.

[0035] Table 1 includes 16 sets of uniformly designed ratios (Examples 1-16), in which the original pulps are all 6L, the proportions of the 1-4 sets of syrups are 1.20, the proportions of the 1-4 sets are 1.25, and the proportions of the 9-12 sets are 1.30, the proportion of 13-16 groups of puree is 1.35, and the data of each component in the table is calculated in the mass unit kg.

[0036] Table 1 Evenly design the ratio of each group

[0037] Example12345678910111213141516 Puree4.84.84.84.85.05.05.05.05.25.25.25.28.18.18.18.1 cement0.540.801.091.340.800.541.341.091.091.340.540.802.001.601.200.80 Fly ash 0.540.801.091.340.8...

Example Embodiment

[0041] Example 17:

[0042] The test results (engineering indicators) in Table 2 are used for data analysis, and the regression relationship between each factor and the specific gravity, plastic strength and compressive strength of the casing material is established by using IBM-SPSS software. Suppose the quality of the original slurry is X1, the quality of cement is X2, the quality of fly ash is X3, the specific gravity of the shell material is G, the 3d compressive strength is P3, the 7d compressive strength is P7, and the fluidity is L. The following relationship (regression function) can be obtained:

[0043]

[0044]

[0045]

[0046]

[0047] The construction site of a shield tunnel underwater karst treatment needs to be equipped with casing material performance of 1.35≤G≤1.60, 130mm≤L≤190mm, P3≤0.3MPa, P7≤0.6MPa. Through the above regression function, using the matlab optimization toolbox fgoalattain function to establish a linear multi-objective mathematical model, the rat...

Example Embodiment

[0050] Example 18:

[0051] The preparation method of the casing material for the shield tunnel underwater karst controllable grouting of this embodiment includes the following steps:

[0052] S1: Measure the engineering indicators required for casing materials through indoor orthogonal experiments;

[0053] S2: Regression of engineering indicators (here engineering indicators mainly refer to the requirements of construction and grouting effects, such as: pumpability, setting time, fluidity, plastic strength, compressive strength, etc. and stone body strength, impermeability, etc.) Analyze, get the regression curve between each component and engineering index. Regression analysis includes: multiple regression analysis of engineering indicators, and the regression model adopts the second-order mixture specification polynomial.

[0054] S3: According to the actual needs of the project, the specific gravity of the clay slurry, the quality of fly ash and the quality of cement are determi...

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Abstract

The invention discloses a jacket material used for controllable grouting of shield tunnel underwater karst, and a preparation method thereof. The jacket material comprises a clay raw slurry, cement, water and fly ash, the clay raw slurry is formed by stirring clay and water, the specific gravity of the clay raw slurry is 1.20-1.35, and a mass ratio of the cement to the fly ash is (1-1.5):1. The preparation method comprises the following steps: carrying out indoor quadrature test to obtain the required engineering indexes of the jacket material; carrying out regression analysis on the engineering indexes to obtain a regression curve between all components and the engineering indexes; and determining the specific gravity of the clay raw slurry in the jacket material, the mass of the fly ash and the mass of the cement according to practical engineering demands. The jacket material has the advantages of high stability, high underwater anti-dispersion property, adjustable coagulation time, adjustable strength, and greenness and environmental protection. The preparation method has the advantages of simplicity in calculation, short time and high efficiency.

Description

Technical field [0001] The invention relates to the field of grouting for foundation treatment of geotechnical engineering, in particular to a casing material used for underwater karst controllable grouting of a shield tunnel and a preparation method thereof. Background technique [0002] The existing shield tunnel construction shows that when the grouting process is used to treat water-rich karst or loose formations, there are problems such as easy dilution of the grout, difficult to control the spreading range, and frequent occurrence of stuck pipes, which makes the shield machine easy to be used in the construction process. Engineering accidents such as shield planting head, cutter (pan) damage, karst mud (water) outburst, and machine jam occurred. For this reason, it is proposed to combine an improved controllable sleeve valve tube grouting process with a controllable clay cement paste suitable for water-rich pore formations to form a simple and controllable shield tunnel con...

Claims

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Application Information

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IPC IPC(8): C04B28/04
CPCC04B28/04C04B2201/20C04B2201/50C04B2201/52C04B14/10C04B18/08
Inventor 张聪叶新田张智博阳军生王社增徐传东
Owner CENT SOUTH UNIV
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