Mechanical and macro-microscopic failure characteristics of grouted mudstone considering grout dehydration effect

Jin, Yuhao; Han, Lijun; Guo, Hui; Yang, Shuo; Su, Shanjie; Liu, Zhenjun; Wang, Shengcheng

doi:10.1016/j.engfailanal.2022.106662

Cited by 11 publications

(3 citation statements)

References 36 publications

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“…Integrating Equation (11) with the boundary conditions (r = b/2 and v = 0), the flow velocity distribution of the grout (r p < |r| ≤ b/2) can be obtained as follows:…”

Section: Circumferential Grout Pressure Distributionmentioning

confidence: 99%

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Pressure Model Study on Synchronous Grouting in Shield Tunnels Considering the Temporal Variation in Grout Viscosity

Ma,

Sun,

Jiang

et al. 2023

Applied Sciences

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The grout pressure in the shield tunnel tail void during synchronous grouting is the key to controlling ground settlement and restraining the segment. However, the circumferential, longitudinal, and radial distribution of grout pressure considering the temporal variation in grout viscosity has not been well explored yet. In this study, a theoretical model of grout pressure distribution and dissipation considering the temporal variation in Bingham grout viscosity was established. The simulation results of the pressure model were verified by field-measured data. The results showed that the radial and longitudinal distributions of grout pressure considering the temporal variation in grout viscosity were closer to the field-measured data. The impacts of the main parameters on the pressure distribution and dissipation were analyzed. Compared with the effect of the shield tail void thickness, tunnel radius and yield shear stress have greater effects on grout pressure during the circumferential filling phase. During the longitudinal and radial diffusion phases, the increase in soil porosity and permeability coefficient was conducive to grout diffusion. The increase in the grout viscosity reduces the pressure loss during the grout flow process. The results of this research can provide a theoretical basis for the grout design process in shield tunnels.

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“…Integrating Equation (11) with the boundary conditions (r = b/2 and v = 0), the flow velocity distribution of the grout (r p < |r| ≤ b/2) can be obtained as follows:…”

Section: Circumferential Grout Pressure Distributionmentioning

confidence: 99%

“…The main research methods of grout pressure include experiment [10][11][12], numerical simulation [13][14][15][16], and theoretical analysis [17][18][19]. Grouting materials usually include two types: single-component grout and double-component grout.…”

Section: Introductionmentioning

confidence: 99%

Pressure Model Study on Synchronous Grouting in Shield Tunnels Considering the Temporal Variation in Grout Viscosity

Ma,

Sun,

Jiang

et al. 2023

Applied Sciences

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“…Low-permeability unfavorable geological bodies such as mudstone, argillaceous interlayer, and mud-bearing fracture zone are commonly found in underground engineering in China [1,2]. Their occurrence state and pore structure characteristics are closely related to engineering construction, which, in many cases, has a significant impact on the safety and stability of engineering structures [3,4].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Gelling Properties of Nano-Silica Sol and Its Spontaneous Imbibition Grouting Mudstone

Zhao,

Xiang,

Zhang

et al. 2024

Processes

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The low-permeability argillaceous rock mass is an unfavorable geological body commonly found in the construction process of underground engineering conditions such as roadways and tunnels. Due to the compact structure and low permeability of the rock mass, grouting with conventional materials cannot effectively seal the micro-cracks of the rock mass. Based on the low efficiency of high-pressure grouting of nano-silica sol, this paper preliminarily explores the regularities and mechanism of grouting and pore sealing of low-permeability rock mass under the action of silica sol imbibition from the aspects of gelling properties of silica sol, core pore structure, imbibition law, and pore sealing characteristics. The results show the following: (1) The increase in particle size during the gel process reduced the injectability and wettability of the silica sol. The imbibition properties of silica sol were time-varying, and the deterioration inflection points of injectability and wettability appeared at 10 h and 9 h, respectively. (2) Catalyst, temperature, gel process, and rock mass permeability will affect the law of core imbibition, and the injectability and capillary force of the grouting material and rock mass will jointly affect the imbibition process of silica sol. (3) Silica sol imbibition changed the pore size distribution of the core, the pore volume above 50 nm decreased, and the pore volume below 50 nm increased. Silica sol has multiple effects such as filling, adsorption, and percolation in the imbibition process of the micro-pores of rock mass, and the adsorption and percolation of silica are related to the nano micro-pores.

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Mechanical Tests and Theoretical Research on Fracture Grouting Reinforcement of Soft and Weak Coal Rock

Wang,

Zhang,

Gong

et al. 2024

Arab J Sci Eng

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Mechanical and macro-microscopic failure characteristics of grouted mudstone considering grout dehydration effect

Cited by 11 publications

References 36 publications

Pressure Model Study on Synchronous Grouting in Shield Tunnels Considering the Temporal Variation in Grout Viscosity

Pressure Model Study on Synchronous Grouting in Shield Tunnels Considering the Temporal Variation in Grout Viscosity

Experimental Study on the Gelling Properties of Nano-Silica Sol and Its Spontaneous Imbibition Grouting Mudstone

Mechanical Tests and Theoretical Research on Fracture Grouting Reinforcement of Soft and Weak Coal Rock

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