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A Dynamic Test on Model Piles in Relative Large Scale Homogeneous Remolded Soil

Author: WangPanFeng
Tutor: DingQiShuo
School: Nanjing Agricultural College
Course: Agricultural Biological Environmental and Energy Engineering
Keywords: Model test Uniform Remodeling of soil samples Compaction Pile resistance Hydraulic system
CLC: TU473.1
Type: Master's thesis
Year: 2009
Downloads: 16
Quote: 0
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Abstract


Pile foundation due to its vertical bearing capacity, uplift bearing capacity, anti-level bearing capacity and seismic capacity has irreplaceable advantages, has been widely used in engineering. But there are still a lot of problems need to be solved, such as pile side resistance, especially negative skin friction, the the Pile Foundation front-end and surrounding soil stress field distribution, pile foundation stability problems. Due to the complexity of the pile - geotechnical conditions, in particular, the nature of soil differences, to the research work has brought great difficulties to become the focus in the field of Civil Engineering Research, difficult and hot. Therefore, the research not only has important engineering significance, also has important theoretical significance. Indoor model test there is an important problem, that is the preparation of the soil base. The research in this area is almost not been reported, however, an ideal soil base is often the key to success or failure of the Model Test. Clay, the complexity of its nature, especially the changes in some factors will have a significant impact on the nature of the cohesive soils, with the preparation of the test is more difficult with ideal soil base. Therefore, interior remodeling soil samples were prepared with important practical significance. The purpose of this study is to seek production of relatively homogeneous remodeling soil samples, and this production model test of soil-based multi-diameter model pile test reveals pile foundation penetration and pull out the pile tip and pile side resistance with pile diameter and depth of the changes. First production of small-scale soil base, to explore affect the structural uniformity of the conditions in the small-scale soil-based production process, the sample preparation method and operating parameters of the production of uniform soil samples. On this basis to explore large-scale soil-based production technology, combined with literature reports on large-scale soil-production scale about 30cm scale soil base by means of a hydraulic power system model using different diameter pile in soil based on the large-scale The dynamic penetration with the pullout of the research, and the use of the test system measured the pile penetration and pull out resistance in the process, the study of different scales piles in relatively homogeneous soil base resistance changes with depth, and based on the results of verification soil groups uniformity. The main conclusions and results of this paper are as follows: 1. Proposed as soil compaction quality control indicators of soil porosity (ratio), the current norms and regulations to control the quality of the filling works are based on the indicator of the degree of compaction However, due to the porosity (ratio) is more intuitive to reflect the effect of soil compaction, so you can try porosity (ratio) of compacted soil behind the scene with indoor standard compaction the Houtu porosity (ratio) comparison this more precise definition of the indicators of the degree of compaction. And easy way to measure soil porosity (ratio), compared with the existing methods, this method has a simple, low cost, and more accurate results. Indoor non-standard small compaction test reflect the nature and performance of clay in nonstandard compaction state, drew some special law. Concept of sample preparation factor, a reasonable sample preparation factor remains to be done in-depth discussion, reshaping the nature of soil samples is directly related to indoor model test results, indoor model test remolded sample preparation is also worth further research. Designed mobile hydraulic power system, the power source for the production of the soil base model pile test. Approximately linearly with displacement increase by indoor model pile penetration and pull out the test, to get pile penetration between pile and soil resistance increases linearly with displacement growth trends; pull out process, the pile-soil resistance decreasing trend. With increasing pile diameter, corresponding to the resistance is also increased significantly. Maximum tip resistance in the proportion of the total impedance decreasing trend with increasing pile diameter and aspect ratio, but when the aspect ratio reached 75, the decreasing trend slowed, and approximation tends to a constant. Tip resistance tended to increase with the pile diameter increases, the displacement of the change in the process of penetration tip resistance almost no significant impact from the side to verify the relative uniformity of the soil base.

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CLC: > Industrial Technology > Building Science > Soil mechanics,foundation engineering > Foundation > Pile foundation and deep foundation > Pile
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