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Geometric Reliability Analysis of Composite Foundations Comprising Cement–Fly Ash–Gravel Piles at Site-Specific Scale. CODEN: JTEVAB. ... Based on an intuitive evolutionary geometry of the PDCs in the original physical space of two dependent random variables, a reliability index is defined as a distance ratio of two PDCs, i.e., the ...
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The Cement Fly Ash and Gravel (CFG) Pile and Encased Stone Column (ESC) are the ground improvement techniques. The main object of the study is to the numerical analysis of the Both techniques pile ...
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1. Introduction. Over the past two decades, many high-speed railways have been constructed in China. In order to ensure that those high-speed railways can normally operate in design life, pile-supported embankments (GRPS) are widely adopted to reduce large differential settlement and postsettlement, for example, cement-fly ash-gravel …
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Due to the special characteristics of loess, the foundation of a high-speed railway is easy to compress and settle, and reasonable treatment of the foundation can reduce the settlement of the foundation. Based on the test section of Yinxi high-speed Railway and the finite element method, the differential settlement problem of CFG …
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Cement-Fly Ash-Gravel Pile or CFG Pile was developed based on stone column. When the stone column is applied in soft soil conditions, stone column is not reliable due to the confine resistance is relatively low. Cement and Flyash is mixed with gravel to work as binder therefore CFG column is a rigid column. Due to the CFG column is rigid column ...
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The Cement Fly Ash and Gravel (CFG) Pile and Encased Stone Column (ESC) are the ground improvement techniques. The main object of the study is to the …
WhatsApp: +86 18221755073
Based on back analysis of lateral displacements measured in situ by using the analytical solution, a useful method for estimating stress concentration ratio of geosynthetic-reinforced and pile-supported (GRPS) embankments was proposed. In order to validate the proposed method, a full-scale high-speed railway embankment (HSRE) …
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Zheng et al. (2011) [30] investigated two 50 cement-fly ash-gravel pile-supported high-speed railway embankments, the measurements showed 51 that the majority of loads were loaded by the piles ...
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The differential settlement between the newly built embankment and the old one is becoming a serious problem in the extension construction of roadways in some areas. To solve this problem, cement fly-ash gravel (CFG) piles are used to control settlements because of their simple construction.
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age percentage of increase for mixtures made with 15 percent F-2 fly ash (mixture nos. 3, 6, 9, 12, and 15) was 0.071 percent, with two of the five mixtures exceeding the …
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Fly Ash Two type-C fly ashes, produced at two Kansas power plants (Jef frey and LaCygne), were used. The specific surface areas of the two ashes (blaine fineness) are 3,760 and 4,200 cm2/g, respectively. The alkali contents of the two fly ashes are (as Na20 equivalent) 0.84
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1. Introduction. Consumption of industrial wastes as dust and/or aggregate in geotechnical application is developing globally. Cement-fly ash-gravel (CFG) piled composite foundation is a part of it where the by-product fly ash is used as a constituent material to improve poor engineering properties of soft or weak foundation soils using …
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Thus, using cement fly ash gravel column-supported embankments is more productive than using a soil-cement column and granular pile to increase the column …
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Based on the analysis of constitutive materials and construction techniques, the whole consolidation process of composite ground with cement fly-ash gravel (CFG) piles was divided into two stages ...
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AbstractThis study presents a full-scale test of high-speed railway embankments to investigate the performance of cement-fly ash-gravel (CFG) pile-supported embankments over completely decomposed granite (CDG) soil …
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Geometric Reliability Analysis of Composite Foundations Comprising Cement–Fly Ash–Gravel Piles at Site-Specific Scale May 2020 Journal of Testing and Evaluation
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Fly ash or coal ash are mineral residues from the combustion of pulverised fuel (usually coal). When fly ash is mixed with lime and water, it creates a pozzolanic reaction and is cementitious. Coarse-grained soils with little to no fines can be stabilised using lime fly ash or lime-cement fly ash.
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Combined with the SEM and EDS test results, the dwastribution of Ca(OH)2 in the hydration products of cement within the cement-and fly ash stabilized aeolian sand gravel specimens was low: one was because Ca(OH)2 reacts with fly ash in an alkali excitation reaction, and the hydration products generated by the two binding materials …
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The strength of CFBFA is primarily determined by two reactions: (1) ... The composite gravel prepared from fly ash with high compressive strength can be used as a substitute for natural sandstone material that is restricted to be mined due to the resource shortage. The composite gravel is mainly used in the transportation industry for the ...
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material and road surface gravel 35 Fig. 3 Back-calculated Mr of fly ash-stabilized layer from FWD data at Waseca ... reviews the data collected at these two sites as well as other fly ash stabilization projects that the investigators monitored in Wisconsin to arrive at some general observations and
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Fly ash offers advantages in a number of applications – from upgrading gravel roads and ... as a stabilizing agent for recycled pavement material and road surface gravel through two demonstration projects – the reconstruction of a city street in …
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All content in this area was uploaded by Xing Zheng Wu on Jul 08, 2019
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The Beijing-Tainjin high-speed railway were constructed between two major cities in China. Since part of the railway is over soft marine clay, appropriate ground ... cement, fly ash, gravel, and ...
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This paper presents thefindings of the numerical studies performed on a two-tiered reinforcedfly ash wall. Fly ash was used asbackfill material and jute geotextile was used as reinforcement as ...
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is maintained for two hours, until the maximum load is reached; nally, the unloading starts step by step, and 250 kN is unloaded each time and, after each loading, Table 1 The calculation parameters of CFG pile + cement–soil compacted pile composite foundation model Name Density (kg/ m3) Elastic Modulus (kPa) Poisson's ratio Internal fric-
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The volumetric water content of the stabilised soil decreased with the addition of fly ash for two different CL type soils. ... (F-T) performance of sandy lean clay (CL) subgrade, silty sand with gravel (SM) recycled subbase, and loess silt (ML). CFA-stabilised pavements subjected to F-T cycles showed lower heave rates with up to 15% …
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Based on the double-layered foundation theory, the composite ground with partially penetrated cement fly-ash gravel (CFG) piles was regarded as a double-layered foundation including the surface reinforced area and the underlying untreated stratum. Due to the changing permeability property of CFG piles, the whole consolidation process of …
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However, there is a special type of piles commonly used for building foundations, the so-called cement-fly ash-gravel (CFG) piles. CFG pile foundations are composed of relatively small diameter (350–600 mm), short (less than 20 m) piles made of C15-C25 cemented fly-ash gravel.
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CFG pile composite foundation treatment technology is one of the most commonly used foundation reinforcement technology. Its parameter design usually adopts the trial algorithm. Under the premise of meeting the design requirements, there are many combinations of different parameters, and it is difficult to find the most economical design scheme. By …
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Studies related to the approach block were conducted which focused on several materials [2][3][4] and groundreinforcement strategies [5,6]. Cement-treated gravel is a material typically used for ...
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