A clay grouting technique for granitic rock adjacent to clay bulkhead

Masumoto, Kazuhiko; Sugita, Y.; Fujita, Tomoo; Martino, J.B.; Kozak, E.T.; Dixon, David A.

doi:10.1016/j.pce.2006.03.013

Cited by 10 publications

(3 citation statements)

References 2 publications

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“…Not only the frequency but also the length of fractures is of interest. As a key conclusion drawn from simulation of flow in fracture systems, long fractures will conduct more water than short fractures, due to higher connectivity (Odling 1997;Babiker and Gudmundsson 2004;Masumoto et al 2007;Mitchell and Faulkner 2012). Detailed analyses of the damage zones reveal subzones characterized by distinct fracture sets and populations, as outlined in Braathen et al (2004).…”

Section: Introductionmentioning

confidence: 96%

Predictive permeability model of faults in crystalline rocks; verification by joint hydraulic factor (JH) obtained from water pressure tests

2014

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In the present study, a new model is proposed to predict the permeability per fracture in the fault zones by a new parameter named joint hydraulic factor (JH). JH is obtained from Water Pressure Test (WPT) and modified by the degree of fracturing. The results of JH correspond with quantitative fault zone descriptions, qualitative fracture, and fault rock properties. In this respect, a case study was done based on the data collected from Seyahoo dam site located in the east of Iran to provide the permeability prediction model of fault zone structures. Datasets including scan-lines, drill cores, and water pressure tests in the terrain of Andesite and Basalt rocks were used to analyse the variability of in-site relative permeability of a range from fault zones to host rocks. The rock mass joint permeability quality, therefore, is defined by the JH. JH data analysis showed that the background sub-zone had commonly <3 Lu (less of 5×10 −5 m 3 /s) per fracture, whereas the fault core had permeability characteristics nearly as low as the outer damage zone, represented by 8 Lu (1.3×10 −4 m 3 /s) per fracture, with occasional peaks towards 12 Lu (2×10 −4 m 3 /s) per fracture. The maximum JH value belongs to the inner damage zone, marginal to the fault core, with 14-22 Lu (2.3×10 −4-3.6×10 −4 m 3 /s) per fracture, locally exceeding 25 Lu (4.1×10 −4 m 3 /s) per fracture. This gives a proportional relationship for JH approximately 1:4:2 between the fault core, inner damage zone, and outer damage zone of extensional fault zones in crystalline rocks. The results of the verification exercise revealed that the new approach would be efficient and that the JH parameter is a reliable scale for the fracture permeability change. It can be concluded that using short duration hydraulic tests (WPTs) and fracture frequency (FF) to calculate the JH parameter provides a possibility to describe a complex situation and compare, discuss, and weigh the hydraulic quality to make predictions as to the permeability models and permeation amounts of different zone structures.

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Section: Introductionmentioning

confidence: 96%

Predictive permeability model of faults in crystalline rocks; verification by joint hydraulic factor (JH) obtained from water pressure tests

2014

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“…Zhang et al, systematically classified the grouting effect evaluation methods and put forward the inspection methods and standards of various grouting technologies, which provided a reference for the grouting construction of similar projects [37]. In addition, many scholars studied the diffusion law of cement slurry in planar fractures by numerical simulation software and obtained the parameters such as diffusion radius and grouting pressure of slurry [8,9,[38][39][40][41][42].…”

Section: Introductionmentioning

confidence: 99%

Diffusion Mechanism of Slurry during Grouting in a Fractured Aquifer: A Case Study in Chensilou Coal Mine, China

Zhai

Bai

2022

Mathematics

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Grouting is one of the main technical means to prevent water inrush hazards in coal seam floor aquifers. It is of great significance to elucidate the diffusion law of slurry in the process of grouting in fractured aquifers for safe mining in coal mines. In this paper, the mechanism of slurry diffusion in horizontal fractures of fractured aquifers was studied based on the Bingham slurry with time-varying characteristics; additionally, a one-dimensional seepage grouting theoretical model considering the temporal and spatial variation of slurry viscosity under constant grouting rate was established. In this model, the grouting pressure required by the predetermined slurry diffusion radius can be obtained by knowing the grouting hole pressure and injection flow. Slurry properties, fracture parameters, grouting parameters, and water pressure were the parameters affecting the slurry diffusion process. Looking at the problem of water disaster prevention of coal seam floor in the Working Face 2509 of the Chensilou Coal Mine, according to the aquifer parameters and model calculation results, a grouting scheme with a slurry diffusion radius of 20 m and grouting pressure of 12 MPa was proposed. Finally, with the comparative analysis of the transient electromagnetic method (TEM) and water inflow before and after grouting, it was verified that the design grouting pressure and the spacing of grouting holes were reasonable and the grouting effect was good.

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“…Because many pores in the excavation damage zone (EDZ) are connected with the excavation face, grouting into EDZ is very difficult. Masumoto et al conducted the clay grout in situ injection test for EDZ adjacent to the clay bulkhead and evaluated the ability of clay grout to reduce EDZ permeability through the field test [11]. e chemical grout materials included water glass, polyurethane, epoxy resin, and organic polymer composite grout, among other materials [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Properties and Applications of a New Chemical Grouting Material

Yang

Zheng

et al. 2020

Advances in Civil Engineering

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The study investigates a new chemical grout by mixing the main agent, auxiliary agent, catalyst, foam stabilizer, solvent, and water, to treat the distress of railway tunnel. The orthogonal design was used to obtain 16 groups of grout proportion schemes, and reasonable proportion parameters were screened using laboratory and field tests. Additionally, this study included detailed research on the grout performance. The test results showed that the proportion schemes of groups 3, 4, and 15 grout were the most reasonable. In particular, for group 3, the viscosity is 663 MPa·s, the curing time is 119 s, the foaming capacity is 1589%, and the compressive strength is 20.16 MPa. For group 4, the viscosity is 663 MPa·s, the curing time is 137 s, the foaming capacity is 1809%, and the compressive strength is 17.76 MPa. For group 15, the viscosity is 281 MPa·s, the curing time is 98 s, the foaming capacity is 1173%, and the compressive strength is 26.79 MPa. Groups 4 and 15 grouts were used to treat the frost boiling and track bed subsidence in existed railway tunnels. Based on this, field monitoring showed that muddy water became clear water with an average depth of only 4 mm in the drainage ditch and that the irregular subsidence of the track bed was also solved after treatment. According to the aforementioned experimental research and analysis, it is proven that new grout not only exhibits a reasonable solidification time, high strength, and excellent waterproofing and impermeability with no pollution of the environment but also can be produced by a safe and convenient synthesis method. Group 4 is suitable for treating tunnel seepage, group 15 is suitable for structural reinforcement, and group 3 confers the advantages of seepage prevention, leakage stoppage, and reinforcement.

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A clay grouting technique for granitic rock adjacent to clay bulkhead

Cited by 10 publications

References 2 publications

Predictive permeability model of faults in crystalline rocks; verification by joint hydraulic factor (JH) obtained from water pressure tests

Predictive permeability model of faults in crystalline rocks; verification by joint hydraulic factor (JH) obtained from water pressure tests

Diffusion Mechanism of Slurry during Grouting in a Fractured Aquifer: A Case Study in Chensilou Coal Mine, China

Properties and Applications of a New Chemical Grouting Material

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