Studies on Geology of the Backfilling Fly Ash and the Foundation Treatments
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Whether the site of backfilling fly ash was appropriate for engineering geology, and how to use effective means to change the geologic bearing capacity of the site were urgent solving problems. This work took a site of backfilling fly ash in the Beishiwang Village, Yindu District, Anyang City, Henan Province as object of study, detailedly did a complete geologic survey on it, got related data and made its engineering geologic assessment and according to the characteristics and requirements of construction projects, we select the most optimal treatment means of the foundation and adopt the most safe and economic perfusion pile with post-pressure grouting to strengthen this engineering foundation.Keywords:
Foundation (evidence)
Research Object
Geological survey
The study of inclined pile groups with center pile is new and important for development of pile foundation. This paper presents that model tests about inclined pile groups with center pile have been conducted considering the different inclination of pile. The results show that the settlement curve of vertical pile groups presents gradual while that of inclined pile groups presents steep. There exists an optimal inclination to increase the vertical bearing capacity for inclined pile groups, which is located between 8°∼12°. In vertical pile groups, the distributing rules of axial force at the same depth are as follows: the biggest is the corner pile, next is the side pile, and the smallest is the center pile; but in inclined pile groups, the biggest is the center pile and the smallest is the side pile.
Foundation (evidence)
Settlement (finance)
Pile cap
Inclination angle
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Hammer
Dynamic load testing
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1. Uses of Fly Ash in Cement and Concrete 2. Effect of Fly Ash on the Properties of Fresh Concrete 3. Effect of Fly Ash on the Structural Properties of Hardened Concrete 4. Admixtures in Fly Ash Concrete 5. Miscellaneous Opportunities for Fly Ash Use 6. Fly Ash Usage in Waste Management 7. Special Problems Including Use Constraints 8. Types and Properties of Fly Ash 9. Effect of Fly Ash on the Durability of Concrete 10. Applications of Fly Ash in Special Concretes
Properties of concrete
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In order to improve comprehension for the rule of interaction between pile,soil and pile caps,the software ABAQUS was applied to stimulate the different working properties of anchored silent group piles' foundation under different pile length,side length,pile spacing,number of pile and thickness of piles cap.The effect coefficient of group pile and undertaking ratio of pile cap will decreased with the increase of pile length and number of piles,but not the pile spacing.The results will be useful to the guidance of pile foundation design and make the design of pile to accord with real working conditions.
Foundation (evidence)
Pile cap
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In order to study the rule of pile floatation in prefabricated pile construction,in-situ test for pile floatation in prefabricated pile construction in Wenzhou has been carried out systematically.Test results hold that pile floatation is related to construction distance and construction order.In addition,pile floatation is larger when pile construction quantity per date is more,pile final-pressure value is higher and soil on the periphery of pile is harder.According to test data,it is found that pile floatation is different with different pile penetration length,but the pile penetration speed doesn’t influence on pile floatation speed.What’s more,pile pre-drill hole,release hole as well as barrier can reduce effectively pile floating.Finally,the paper suggests redriving pressure value determination must be based on local experience in relation of the single pile vertical supporting capacity characteristic value,soil characteristics,pile length as well as the pile supporting level.
Standard penetration test
Foundation (evidence)
Penetration (warfare)
Pile cap
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In order to study the effect of pile-soil-pile interaction on the mechanism of pile base resistance in pile groups,a calculating model is proposed for the ultimate tip bearing capacity of a pile group in cohesionless soil based on the Ohde's pattern derived from the compression mechanism for a single pile.From this model an approach is derived to evaluate respectively the ultimate base resistance of an individual outside pile or an individual inside pile in a pile group.In this theoretical procedure,the influence on the ultimate pile tip resistance is taken into account by the pile spacing,pile diameter,pile embedding length and the properties of the soil below the pile tip.The pattern given by the theoretical formula that the pile base bearing capacity increases with the relative pile spacing(the ratio of pile spacing to pile diameter)decrease agrees with that measured in a model test.
Base (topology)
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Fly ash is one of the most voluminous industrial byproducts that result from coal combustion. This study examines the physical and chemical characteristics of fly ash with the aim of: differentiating between high-Ca fly ash with low Ca ash, and exploring the statistical variability of fly ash properties. The paper describes the results of the laboratory tests used to evaluate the cementing characteristics of Class C fly ash obtained from power plant burning subbituminous Wyoming coal. Laboratory tests demonstrate that fly ash can be effectively used as cement surrogates in portland cement concrete, for intermediate strength fly ash concrete or flowable fills, and for low strength clay soil stabilizer.
Statistical Analysis
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As urbanization increase worldwide, the accessible land for building is becoming lesser, and also the value of land is changing higher and higher. Thus, the recognition of tall structures is increasing day by day and to resist a load of those structures correct stiff foundation is to be used like pile foundation which has the study of static analysis of pile foundation. In this paper, an effort is made to review completely different types of soils like clays with different consistency, sand with different density having a unique angle of internal friction with layers of sand and clay, and find the settlement of pile groups by exploiting completely different types or methods for settlement of pile foundation. The analysis of single pile and group of pile considering the variation in parameters of the single pile, pile group, pile cap analysis, additionally been enclosed during this study with the varied combinations of soil parameters and loads and also included the settlement of pile foundation. The ultimate bearing capacity of the pile and pile group for the given soil condition with the analysis gives the number of piles, dimension of the pile, and spacing of piles within the pile group for various soil conditions.
Foundation (evidence)
Settlement (finance)
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A quantitative understanding of the efficiency of fly ash as a mineral admixture in cement-based materials is essential for its effective utilisation. The present paper is directed towards a specific understanding of the efficiency of fly ash in cementitious materials systems by considering the independency of fly ash and its dependency on the characteristics of the cementitious materials system. A new method of quantitatively evaluating the strength effect of fly ash is proposed, in which two parameters, the strength-effect index and the strengthening factor, are employed to study strength development in fly ash mortars and concretes and to further analyse the influences of water to binder ratio (w/b) and the replacement amount of fly ash on strength. Results indicate that the strength effect of fly ash in mortar systems is different from that in concrete; the strength effect of fly ash varies with both amount of fly ash and w/b. Furthermore, in a concrete system, two different optimal w/b ratios are used to maximise the strength-effect index and the strengthening factor of fly ash, respectively. An optimum amount of fly ash exists for an optimal unit strength-effect index in concrete. It is shown that the method presented in this paper is reasonable and effective in assessing the efficiency of fly ash. This information will strengthen the effective utilisation of fly ash in cementitious materials and design of fly ash concrete.
Cementitious
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Model pile load testing is effective to study the load-settlement behaviour of pile foundations given the controlled environment in which the testing is done. This paper reports a testing program in a large calibration chamber involving individual piles and pile groups installed in sand samples of three different densities. Tests on both nondisplacement and driven piles are evaluated to assess the influence of the pile installation process on pile load-settlement response. A method is proposed to predict the load-settlement response of a pile group based on the response of a single pile. The method is shown to produce estimates that are in good agreement with measurements. The influence of pile group configuration, pile spacing, soil density and method of pile installation is discussed.
Settlement (finance)
Dynamic load testing
Load testing
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