Study of cement-grout penetration into fractures under static and oscillatory conditions

Mohammed, Mohammed Hatem; Pusch, Roland; Knutsson, Sven

doi:10.1016/j.tust.2014.08.003

Cited by 55 publications

(24 citation statements)

References 7 publications

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“…There were five groups with the "platform type" change curve of seepage pressure in the orthogonal experiment: Trials No. 4,No.8,No.9,No.15,and No.16. A typical "platform type" change curve of the seepage pressure is shown in Figure 9d.…”

Section: Analysis Of the Grouting Seepage Pressure In The Rough Fracturementioning

confidence: 99%

“…Meanwhile, the pressure of underground water will increase with the difficulty involved in grouting [3]. The flowing water in fractures also affects the grout diffusion, and the flowing water also reduces the strength of adjacent clay [4]. Visualization of grout propagation is achieved through laboratory experiments, using the grout diffusion distance and the shape of grout diffusion as the main research objects.…”

Section: Introductionmentioning

confidence: 99%

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

2019

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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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Section: Analysis Of the Grouting Seepage Pressure In The Rough Fracturementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

2019

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“…However, the concealment of rock fractures causes great difficulty for site test, while lab experiment is more feasible to observe the grout flow in the fracture. In this regard, the parallel-plates fracture, formed by two stiff rectangular plates or discs, is the most widely used model to investigate the grout flow and propagation [12][13][14][15]. On this basis, the effects of the grout properties, the grouting procedure, the geometry of the fracture, and the underground environmental conditions such as underground water on the diffusion behavior of grout in the fracture were studied [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

A Quasi‐3D Numerical Model for Grout Injection in a Parallel Fracture Based on Finite Volume Method

Hao

Zhong

et al. 2019

Complexity

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The purpose of the present work is to develop a quasi-3D numerical method that can be used to study the diffusion mechanism of grout injection in a rock fracture based on the collocated structured grid of the finite volume method (FVM). Considering the characteristics of fracture in geometry that the aperture is much less than its length and width, the Hele-Shaw model is introduced to deduce the z-derivatives of velocities u and v at walls, which is a function of the relevant average velocity and the fracture aperture. The traditional difference scheme for the diffusive term is partly substituted with the derived analytical expressions; hence a three-dimensional problem of grout flow in the parallel fracture can be transformed into a two-dimensional one that concerns fracture aperture. The new model is validated by the analytical solution and experimental data on three cases of grouting in the parallel-plate fracture. Compared with the results from ANSYS-Fluent software, the present model shows better agreement with the analytical solution for the distribution of pressure and velocity. Furthermore, the new model needs less grid unit, spends less time, but achieves greater accuracy. The complexity of the grout flow field in the rock fracture is reduced; thus the computational efficiency can be improved significantly.

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“…Different grain size mixtures are randomly distributed within the coal roof, wall, and pillar of a coal seam in the western China mining area where the overlying rock structures for most of the main coal seams are typically at shallow depths and are overlaid by thick sand layers and underlaid by thin bedrock, which poses substantial safety issues for mining operations. Grouting is a technique that can effectively improve the physical and mechanical characteristics of the fractured rock, including the crushed zone with many crack openings and voids (e.g., the abovementioned partial fragmentation), which has been widely applied in geotechnical and mining engineering [1][2][3][4][5][6]. e grouting technique can achieve the main objective of rock mass reinforcement by injecting, filling (even splitting grouting), conglutinating, and solidifying the rock mass, successively.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties of Grouted Crushed Coal with Different Grain Size Mixtures under Triaxial Compression

Jin

Han

Meng

et al. 2018

Advances in Civil Engineering

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To have a better understanding of the reinforcement effect on the crushed zone after grouting in coal mining extraction work, a self-designed grouting apparatus was used to study the effects of the grain size mixtures (distribution) and the stress state on the mechanical behaviours of grouted crushed coal specimens. From the various grouting tests, triaxial compression tests and scanning electron microscopy (SEM) observations of grouted specimens with different grain size mixtures, it was found that, for the same grain size mixture, the peak (σp) and residual (σr) strengths of the grouted specimens increased with an increase in confining pressure. It was found that the average slope values of the σp-σ3 curves for the grouted specimens with different grain size mixtures were all larger than those of the σr-σ3 curves. It was observed that the peak strain (εp) of the grouted specimens with different grain size mixtures increased overall with increasing confining pressure. For constant confining pressure, the peak and residual strengths both gradually increased approximately linearly as the grain size mixtures varied from small to large, but at higher confining pressures, the influence of the grain size mixture on the peak (or residual) strength increased. These mechanical behaviours of the grouted crushed coal specimens were strongly dependent on the variation in the grain size mixtures and in the confining pressure, which can be explained by the crack evolution process within the grouted specimen under triaxial compression, to a certain extent. Ultimate failure of the grouted specimen occurred just after propagation and coalescence of the cracks through the entire grouted specimen. Moreover, there were three major microscopic diffusion modes for the grouts flowing in most of the crushed coal specimens. Based on these test results, it was found that the reinforcement effect of the grouted specimen related to the splitting grouting mode (occurring in most of the large specimens) seems to be better than that of the penetrating (filling) grouting mode (in most of the small specimens).

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Study of cement-grout penetration into fractures under static and oscillatory conditions

Cited by 55 publications

References 7 publications

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

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

A Quasi‐3D Numerical Model for Grout Injection in a Parallel Fracture Based on Finite Volume Method

Mechanical Properties of Grouted Crushed Coal with Different Grain Size Mixtures under Triaxial Compression

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