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Effect of a filter cake on shear behavior of sand-concrete pile interface

Journal of Central South University 2022年第6期29卷 2019-2032页

作者： CHEN Chen LENG Wu-ming YANG Qi DONG Jun-li XU Fang RUAN Bo Department of Civil Engineering Central South UniversityChangsha 410075China MOE Key Laboratory of Engineering Structures of Heavy Haul Railway Changsha 410075China Hunan Tieyuan Civil Engineering Testing Co. Ltd.Changsha 410075China

A filter cake is often formed between soil and concrete during casting concrete in the ground,such as constructions of diaphragm walls and bored *** present study aims to investigate the effect of the filter cake on the shear behavior of the sand-concrete pile interface.A series of sand-concrete interface direct shear tests were performed with a large-direct shear apparatus while considering different roughness(I=0,10,20 and 30 mm)and filter cake thickness(Δh=0,5 and 10 mm).For a smooth interface without a filter cake,the shear stress-horizontal displacement curves showed a“softening”*** peak shear strength and friction angle decreased exponentially with increasing theΔ***,for a rough interface withΔh=5 or 10 mm,the shear stress-horizontal displacement curves presented a“hardening”*** peak strength,as well as friction angle,decreased linearly with increasing theΔ***,a critical roughness I_(cr)of 10 mm was observed in the tests without a filter *** interface shear strength initially increased with increasing I but gradually decreased when the I exceeded I_(cr).In addition,the filter cake could reduce the roughness sensitivity on shear strength.

关键词： filter cake sand-concrete pile interface large scale direct shear test shear behavior critical roughness

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Effects of slurry viscosity and particle additive size on filter cake formation in highly permeable sand

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Underground Space 2022年第2期7卷 151-161页

作者： Zhikui Wang Yuan Wang Di Feng Jinhui Zhang Sijin Liu College of Civil and Transportation Engineering Hohai UniversityNanjing 210098China College of Water Conservancy and Hydropower Engineering Hohai UniversityNanjing 210098China State Key Laboratory of Hydrology-Water Resources and Hydraulic EngineeringHohai UniversityNanjing 210098China China Railway 14th Bureau Group Co Nanjing 210098China

filter cake is critical to maintaining the stability of the excavation face of an underwater shield tunnel in a high-permeability *** a high-permeability formation,generating an effective filter cake on the excavation face is difficult with a pure bentonite slurry,which penetrates the ground and may not achieve the required suspension *** how to efficiently and quickly form a thin and low-permeability filter cake on the tunnel working face has become a key engineering problem in the construction of slurry shield tunnels in high-permeability *** this study,the relationship between slurry viscosity and the slurry pressure gradient of pure bentonite was established by performing slurry permeability *** influence of slurry viscosity on the formation of the filter cake in a high-permeability formation was studied under different pressure *** addition,the effect of additive particle size on the slurry filter cake formation was analyzed by introducing additives with different particle sizes to pure bentonite slurries with different *** test results indicate that(1)for the pure bentonite slurry,the critical initial pressure gradient can be used as a rough indicator of the formation of the filter cake,and the relationship between the critical maximum pore diameter and the average pore diameter of the for-mation can be compared to establish and analyze the formation law of the slurry filter cake;(2)adding particles to the slurry can enhance the effect of the pure bentonite slurry;and(3)adding coarse-grained materials can effectively improve the film-forming *** slurry is more compact when the particle size is close to the average pore size of the formation.

关键词： Slurry shield filter cake Permeability test Slurry viscosity Particle size of additives

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Laboratory study of fluid properties owing to cutting intrusions during horizontal directional drilling

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Underground Space 2020年第1期5卷 20-29页

作者： Pinghe Sun Dingqiang Mo Samuel T.Ariaratnam Han Cao Pengfei Zhang School of Geosciences and Information Physics Central South UniversityChangsha 410083China Key Laboratory of Metallogenic Prediction and Geoenvironmental Monitoring of Ministry of Education Central South UniversityChangsha 410083China School of Sustainable Engineering&The Built Environment Arizona State UniversityP.O.Box 873005TempeAZUSA State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengduChina

During horizontal directional drilling installations,a primary function of drilling fluids is to yield drill cuttings and lubricate the product *** paper presents the results of a research study of drilling fluid parameters,and the filter cake properties associated with drill cutting *** sand meshes and field cutting sizes were added to the drilling *** on the laboratory experiments of eighteen samples including testing drilling fluid rheology and filter cake properties,the influence of drill cuttings on low solid-phase drilling fluid systems were *** results reveal that drilling fluid plastic viscosity values increase with sand content and particle *** 100-mesh sand exhibits a larger plastic viscosity compared to the 200-mesh *** suggests that the coarser the sand,the greater is the plastic *** contrast,drilling fluids with 200-mesh sand exhibit greater shear forces than the 100-mesh *** the sand content is4%,the shear dilution ability of the drilling fluid begins to *** thinnest filter cake is formed after 6 h with a 100-mesh cutting size and 4%sand ***,when the cutting size changed to 150-mesh and 2%content,the largest filter cake toughness and strength after rolling for 12 h were ***,the combination of 200-mesh and 150-mesh with 2%–4%content rolling for 12–24 h indicate different *** the filter cake thickness,cutting content is the primary influencing factor followed by particle size and *** factor with the least influence is rolling *** found that rolling time and gradation were the most significant factors affecting the toughness of the filter cake,followed by cutting ***,particle size exhibits the least influence on filter cake *** results are important to better understand the solid-phase control of drilling fluids in the field.

关键词： Drilling fluid filter cake Drilling cutting Solid-phase control Rheology Horizontal directional drilling

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Ultrafiltration Enhanced with Activated Carbon Adsorption for Efficient Dye Removal from Aqueous Solution

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Chinese Journal of Chemical Engineering 2011年第5期19卷 863-869页

作者：董亚楠苏延磊陈文娟彭金明张岩姜忠义 Key Laboratory for Green Technology of Ministry of Education School of Chemical Engineering and Technology Tianjin University Tianjin 300072 China

In this study, orange G dye was efficiently removed from aqueous solution by ultraflltration （UF） membrane separation enhanced with activated carbon adsorption. The powdered activated carbon （PAC） was deposited onto the UF membrane surface, forming an intact filter cake. The enhanced UF process simultaneously exploited the high water permeation flux of porous membrane and the high adsorption ability of PAC toward dye molecules. The influencing factors on the dye removal were investigated. The results indicated that with sufficient PAC incorporation, the formation of intact PAC filtration cake led to nearly complete rejection for dye solution under opti-mized dye concentration and operation pressure, without large sacnticlng the permeation tlux ot the filtration process. Typically, the dye rejection ratio increased from 43.6% for single UF without adsorption to nearly 100% for the enhanced UF process, achieving long time continuous treatment with water permeation flux of 47 L·m^-2·h^-1. The present study demonstrated that adsorption enhanced UF may be a feasible method for the dye wastewater treatment.

关键词： enhanced ultrafiltration powdered activated carbon filter cake adsorption -dye removal

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