Experimental investigation on chemical grouting of inclined fracture to control sand and water flow

Liang, Yankun; Sui, Wanghua; Qi, Jianfeng

doi:10.1016/j.tust.2018.09.038

Cited by 64 publications

(18 citation statements)

References 29 publications

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“…Sand samples with different dry densities are tested to acquire shear strength at different compaction degrees. Sand samples are manufactured with dry densities of 1.45, 1.55, 1.65, 1.75, 1.85, 1.95, and 2.05 g/cm 3 for different clay content and initial water ratios. Clay content of sand samples is set at 10%, 20%, 30%, 40%, 50%, and 100% as shown in Table 2.…”

Section: Cohesionmentioning

confidence: 99%

“…e relationship between grouting pressure p and strain ε can be acquired by the consolidation test in this paper. e relationship between strain and pore ratio can be acquired by equation (3) [21]. e relationship between dry density ρ d and pore ratio e satisfies equation ( 4) [21].…”

Section: Cohesionmentioning

confidence: 99%

“…Water-rich sand layer is characterized by rich water, low cementation strength, and low self-stability. When tunneling or digging foundation pit in water-rich sand layer, disaster accidents are likely to happen, such as collapse or sand inrush in tunnel or foundation pit [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

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Test on Compaction Reinforcement Effect of Sand

Zhang

et al. 2020

Advances in Materials Science and Engineering

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In fracture or compaction grouting projects of sand layer, there exist many compacted sand regions on both sides of grout veins or around grout bulbs. It has an important effect on the final reinforcement effect of the sand layer that how much performance of the sand layer is improved after being compacted. Compression modulus, cohesion, and permeability coefficient are selected to be the performance indexes of the compaction reinforcement effect of sand. The relationship between the performance properties of sand and grouting pressure has been tested and analyzed. And influences of clay content and initial water ratio of sand on the compaction reinforcement effect have been studied. Results show that compaction can effectively improve the mechanical properties and impermeability properties of sand. Compression modulus of sand increases by 2∼18 times. The cohesion of sand increases from the scope of 9.4∼26 kPa to the scope of 40∼113.6 kPa. The permeability coefficient of sand decreases from the scope of 1.0 × 10−2∼ 8.33 × 10−4 cm/s to the scope of 2.19 × 10−4∼2.77 × 10−9 cm/s. When the clay content of sand is smaller than about 20%, sand cannot be reinforced effectively by compaction. Cohesion cannot be improved significantly and the permeability coefficient cannot be reduced markedly. A high initial water ratio of sand is beneficial to improve the compression modulus of compacted sand and goes against the improvement of cohesion of compacted sand. In addition, the initial water ratio has little effect on the permeability coefficient of compacted sand. In the end, fitting formulas have been developed to quantitatively describe the compaction reinforcement effect of sand by different grouting pressures.

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Section: Cohesionmentioning

confidence: 99%

Section: Cohesionmentioning

confidence: 99%

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Test on Compaction Reinforcement Effect of Sand

Zhang

et al. 2020

Advances in Materials Science and Engineering

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“…The influence of formation pressure, water pressure, and thickness of waterproof board on water inrush is studied. Saleh et al and Liang et al [22,23] investigated the chemical composition of polyure-thane and other chemical grouting materials and discussed the grouting methods, grouting materials, advantages and disadvantages, and the application in the field and laboratory. Xu et al [24] developed a complete set of physical simulation system to study the grouting of high-pressure fissures in deep underground rocks such as deep coal mines.…”

Section: Introductionmentioning

confidence: 99%

Groundwater Inrush Control and Parameters Optimization of Curtain Grouting Reinforcement for the Jingzhai Tunnel

Gan

Zhou³

et al. 2021

Geofluids

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Based on the systematic study on the characteristics of water and mud inrush during the excavation of Jingzhai tunnel, the mechanism of water inrush seepage transformation caused by excavation disturbance is analyzed. By means of electromagnetic geophysical prospecting, the potential water bearing area of the tunnel was analyzed. The constitutive model of rock mass and grouting parameters are considered in the numerical simulation. The law of tunnel crack initiation and expansion under different curtain grouting parameters is proposed. The characteristics of seepage water inrush caused by excavation are described. It is considered that there are three stages in the seepage characteristics of tunnel: incubation, sudden, and stable. Numerical simulation was used to analyze the crack propagation track and water inflow characteristics under the grouting thickness of 3 m, 5 m, and 7 m. When the curtain grouting thickness was 3 m, the fracture field penetrated the curtain grouting area. The dominant seepage channel is formed, which greatly increases the probability of water inrush. When the curtain thickness is 5~7 m, the expansion of the crack zone can be controlled basically, so that the fracture and water bearing rock layer cannot form a seepage channel. At last, the grouting scheme of 6 m thick grouting and 20 m advanced grouting was selected, and the water seepage was reduced by 83%.

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“…Sui investigated the changes in seepage pressure and the grout diffusion law in a plate fracture with flowing water, and determined the relationships among the water flow velocity, gel time, aperture width, and sealing effect of grout [12]. Liang investigated the sealing effect of chemical grouting in an inclined fracture with water and sand, the results showed that grouting plays an important role in controlling the sand and water [13]. In addition, grouting pressure plays an important role in grouting and is a crucial factor for grouting results [14].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on Chemical Grouting in a Permeated Fracture Replica with Different Roughness

2019

Self Cite

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This paper presents an experimental investigation on chemical grouting in a permeated fracture replica considering its roughness. Tests of grouting with flowing water in the fracture replica were carried out under different Bardon’s standard roughness profiles. The interactions between influential factors were considered and an experimental platform for grouting in rough fractures with flowing water was established. The effect of chemical grouting in fractures with flowing water was investigated using orthogonal experiment. The joint roughness coefficient (JRC), the initial water flow rate, the gel time, and the fracture opening were selected as factors in the orthogonal experiment. The results show that there is a positive correlation between the water plugging rate and JRC, and negative correlations between the water plugging rate and the initial water flow rate, gel time, and fracture opening. The change curve of the water flow rate is divided into three categories: Single platform decreasing type, double platform decreasing type, and multi-peak fluctuating type. The curve of seepage pressure contains three categories: Single peak type, multi-peak type and platform type. The results provide a reference for grouting in rock fractures.

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Experimental investigation on chemical grouting of inclined fracture to control sand and water flow

Cited by 64 publications

References 29 publications

Test on Compaction Reinforcement Effect of Sand

Test on Compaction Reinforcement Effect of Sand

Groundwater Inrush Control and Parameters Optimization of Curtain Grouting Reinforcement for the Jingzhai Tunnel

Experimental Investigation on Chemical Grouting in a Permeated Fracture Replica with Different Roughness

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