Optimization and application of backfill grouting material for submarine tunnel

Mao, Jiahua; Yuan, Dajun; Jin, Dalong; Zeng, Jie

doi:10.1016/j.conbuildmat.2020.120281

Cited by 31 publications

(10 citation statements)

References 35 publications

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“…Due to automation, the possibility of rapid construction, and a lower impact on the ground, shielding is a widely used method in tunnel construction [ 1 ]. During the excavation process, a gap will be induced between the tunnel segment and surrounding soil [ 2 ].…”

Section: Introductionmentioning

confidence: 99%

“…Extensive studies have been conducted on grouting materials to enhance the tunnel construction, mechanical properties, durability, economic efficiency, etc. [ 1 , 7 , 8 , 11 , 12 , 13 , 14 , 15 , 16 , 17 ]. There is no doubt that these studies have made a significant contribution to knowledge, but practical problems such as tunnel segments floating in the grouting materials, low resilience to earthquakes, and metro lines causing vibration of the structure have not been solved [ 18 , 19 , 20 , 21 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

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A Workability Characterization of Innovative Rubber Concrete as a Grouting Material

Liu²,

Zhang

et al. 2022

Materials

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The aim of this study is to assess the workability of an innovative rubber concrete to fill in the gaps in a shield tunnel construction. This grouting material includes porous sand, PVA (polyvinyl alcohol) fiber, cement, and rubber. One advantage of the material is its high toughness, which is good for the postfailure stage of an earthquake event. Evaluations were carried out on the physical properties in terms of the slurry density, consistency, fluidity, bleeding rate, consolidation shrinkage rate, setting time, and unconfined compressive strength (UCS) (i.e., 3 and 28 days). The toughness index was also introduced to evaluate the performance at the postfailure stage. The results demonstrate that the toughness index will increase as the rubber content increases. It increases from 1.0 at 0% to 1.7 at 80% rubber content (28 days’ curing) and from 1.2 at 0% to 2.2 at 80% rubber content (3 days’ curing). The increase in fiber content and fiber length will also increase the toughness index as the fiber will enhance the tensile strength of the matrix. The results show that when the fiber content increases from 0% to 1%, the toughness index increases from 1 to 7 (28 days’ curing) and from 1.1 to 10 (3 days’ curing). Similarly, if the fiber content or fiber length is above the optimum level, the UCS of the material will be compromised. The optimum fiber content is 0.8%, and the optimum fiber length is 6 mm to 9 mm. This study suggests that the balance of physical properties should be considered in designing a satisfactory grouting material based on the specific purpose of the engineering practice.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Workability Characterization of Innovative Rubber Concrete as a Grouting Material

Liu²,

Zhang

et al. 2022

Materials

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“…Then, the optimal ratio was determined, satisfying the geological conditions of the coal mine through qualitative analysis and the establishment of a new objective programming model. Jiahua Mao et al [24] and Shuai Zhang et al [25] studied the effects on its physical properties through an orthogonal test. The former [24] optimized the formulation of each material through linear regression analysis, and concluded that setting time was mainly affected by the cement-fly ash ratio; the latter [25] optimized the micro-fracture grouting material containing microfine fly ash through analyzing the experimental data with gray correlation.…”

Section: Introductionmentioning

confidence: 99%

“…Jiahua Mao et al [24] and Shuai Zhang et al [25] studied the effects on its physical properties through an orthogonal test. The former [24] optimized the formulation of each material through linear regression analysis, and concluded that setting time was mainly affected by the cement-fly ash ratio; the latter [25] optimized the micro-fracture grouting material containing microfine fly ash through analyzing the experimental data with gray correlation. Related optimization experimental methods have also been widely developed in other fields [26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Optimization of Grouting Material Mixture Ratio Based on Multi-Objective Optimization and Multi-Attribute Decision-Making

et al. 2021

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As a solid waste produced by coal combustion, fly ash will cause serious environmental pollution. However, it can be considered as a sustainable and renewable resource to replace partial cement in grouting materials. Fly ash grouting materials re-cement the broken rock mass and improve the mechanical properties of the original structure. It can reinforce the broken surrounding rock of mine roadway. The utilization of fly ash also reduces environmental pollution. Therefore, this paper establishes a new material mixture ratio optimization model to meet the requirement of material property through combining the methods of experimental design and numerical analysis. Based on the Box–Behnken design with 3 factors and 3 levels, a mathematical model is constructed to fit the nonlinear multiple regression functions between material properties and raw materials ratios. The influence of raw materials is analyzed on material properties (the material’s 7-day uniaxial compressive strength, initial setting time, and slurry viscosity). Then, 80 Pareto solutions are obtained through NASG-II algorithm which takes the regression functions as the objective functions for multi-objective optimization of the grouting material ratio. Finally, the best ratio solution of water-cement ratio—0.71, silica fume content—1.73%, and sodium silicate content—2.61% is obtained through the NNRP-TOPSIS method.

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“…The research results have been applied in mines. However, the problems of bearing capacity, durability, and impermeability of grouting materials have not been solved, especially in strengthening the flexural strength and water inrush performance of deep stopes [15][16][17][18][19][20][21][22][23][24][25][26][27]. Therefore, it is imperative to develop a grouting material with higher compressive and flexural strength, better toughness, and stronger impermeability.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Influence of PVA Content on the Performance of Grouting Material in Deep Stope

Liu

Chen

et al. 2021

Geofluids

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Based on laboratory experiments, the paper researches the effect of polyvinyl alcohol (PVA) content on the performance of fly ash-based cement grouting materials. The test results show that the addition of PVA has limited effect on the initial and final setting time and brings a certain but minor delay on the appearance of the hydration peak period. It enhances cement hydration during the hydration slow down period. The impermeability of PVA to the grouting material is obviously improved, and it increases with the growing amount of PVA content. PVA improves the flexural strength and compressive strength of the sample block to varying degrees, and the improvement on flexural strength is more obvious than that on the compressive strength. It has a significant effect on the mechanical properties of the grouting material and can effectively improve the rock mass’s hydraulic coupling characteristics. It also has great application value and practical significance for the prevention and control of water hazards in deep coal stopes.

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Optimization and application of backfill grouting material for submarine tunnel

Cited by 31 publications

References 35 publications

A Workability Characterization of Innovative Rubber Concrete as a Grouting Material

A Workability Characterization of Innovative Rubber Concrete as a Grouting Material

Optimization of Grouting Material Mixture Ratio Based on Multi-Objective Optimization and Multi-Attribute Decision-Making

Experimental Study on the Influence of PVA Content on the Performance of Grouting Material in Deep Stope

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