2011 Vol. 25, No. 3

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Development and Creation
Compaction Degree Accessing Method Based on Three Points Compacted Method
Chen Jiang, Li Chaozheng, Li Wei
2011, 25(3): 109-112,132. doi: 10.3969/j.issn.1007-2993.2011.03.001
[Abstract](54) [PDF 977KB](4)
Abstract:
Based on the basis theory of three points compacted method, the compaction degree accessing method was proposed in this paper. In this method, the real compaction degrees with various error combinations were got by considering the error between initial water content of compaction samples and water content on rolling field. Then we can get the span of real compaction degree, the probability of real compaction degree bigger than a certain critical value or design index, the probability of approximate compaction degree bigger or smaller than real compaction degree. Based on this method, we can obtain more elaborate information of compaction degree. Therefore, it is better to evaluation the construction quality.
Analysis of Settlement of Underground Pipeline Through Open-excavation in Soft Soil
Lu Haiyuan, Sun Jin
2011, 25(3): 113-116,153. doi: 10.3969/j.issn.1007-2993.2011.03.002
[Abstract](67) [PDF 1134KB](6)
Abstract:
It is strict to control the settlement of pipeline,especially in soft soil. In this paper,a special treatment to the foundation of pipelines is made. In order to study the feasibility of this technology, the pre-consolidation, slope excavation, pipe laying and backfill, are simulated by numerical method with emphasis on the dissipation of excess pore water pressure, the process of the settlement, including the settlement of the pipeline and the ground surface. The results show that the settlement of pipeline is 23cm, the ground surface settlement above the pipe is about 30cm by adopting the new technology of the pipeline processing in ideal conditions. It is safe in situation. Consequently, the treatment to the foundation of the pipeline is reasonable.
I Study on Work Mechanism of Pull Dispersion-type Anchor
Xiao Jian, Zhao Jiewei
2011, 25(3): 117-119. doi: 10.3969/j.issn.1007-2993.2011.03.003
[Abstract](56) [PDF 659KB](6)
Abstract:
It is proved that pull dispersion-type anchor has a simple technology and can enhance the carrying capacity significantly according to the drawing test. Distributing characters of stress has been analyzed combining with the test result of strain gauge.
Deep Foundatim Pit Technoloyy
Application of Soldier Piles with a Single Fulcrum in the Deep Foundation Pit
Zhang Hui, Guo Miwen
2011, 25(3): 120-124. doi: 10.3969/j.issn.1007-2993.2011.03.004
[Abstract](49) [PDF 832KB](4)
Abstract:
An engineering example of a deep foundation pit, which average depth is 16.0m, is introduced in this paper. Based on the analysis of the surroundings around foundation pit and the engineering geological conditions, three optional methods to retain and protect the foundation pit were compared, finally the soldier piles system with a single row of anchor was chosed as the supporting system for the pit. Monitoring result shows that foundation deformations meet all the requirements. The chosen method can not only ensure the safety of the foundation pit, but also cut the cost and shorten the project duration, it can provide reference for similar projects.
The Use of Un-embeded Piles in the Kangda International Bilding Fndtion Pit
Deng Chunhai, Zhang Gengnian, Wang Shoujiang
2011, 25(3): 125-127. doi: 10.3969/j.issn.1007-2993.2011.03.005
[Abstract](44) [PDF 734KB](5)
Abstract:
According to the unique lager and some foundation pit casesof qingdao, the structural design, calculation and use about continous flight anger bored un-embeded piles are introudused and analysed in this thesis;it is proued that the supporting, tructuer can control the foundation pit deformation same as the traditiond enbebedded piles.
Technology Development and Exploration
The Analysis of the Relevancy Between K0 with the Microcosmic Feature Parameter About the Limnetic Facies Sedimentary Soil
Xie Xuening, Zhao Ruibin, Zhang Yan
2011, 25(3): 128-132. doi: 10.3969/j.issn.1007-2993.2011.03.006
[Abstract](33) [PDF 766KB](3)
Abstract:
Still-lateral-pressure-coefficient K0 is a important coefficient in practical engineering. The main effect of the Still-lateral-pressure-coefficient is the properties of soil itself, and K0 is a important engineering properties of the soil. It is tightness between the engineering properties and the microstructure of the soft. So we could explain lots of the soil's engineering properties through the microcosmic view. The research about the concern between the still-lateral-pressure-coefficient and microcosmic feature parameter explains that the parameters are not all relevant with K0. The relevancy of K0 with Roundness is big, while with Equiv Diam, AspectRatio and Count is small.
e Finite Element Analysis of Geogrid Reinforced Embankment
Ma Xilei, Li Zhipeng, Xu Xiawei
2011, 25(3): 133-137. doi: 10.3969/j.issn.1007-2993.2011.03.007
[Abstract](76) [PDF 707KB](7)
Abstract:
In this paper,geogrid reinforced embankment is simulated with the finite element software ANSYS, expound the role of reinforced soil reinforcement principle. Four different geogrid reinforced embankments included unreinforced embankment, sand cushion embankment, one layer of geogrid embankment, two layers of geogrid embankment are calculated with an engineering example. Analyse the impact of reinforced soil on subgrade's lateral displacement, vertical displacement, vertical stress, shear stress and tension of reinforcement under different reinforced methods.
The Application of Multiple Arrays in High Density Electric Dectection in Engineering Investigation
Wang Zhuo, Wang Yukuan, Zhang Qingli
2011, 25(3): 138-141. doi: 10.3969/j.issn.1007-2993.2011.03.008
[Abstract](34) [PDF 922KB](6)
Abstract:
The survey line of high density electric dectection is usually made of multiple arrays, we combine the multiple arrays to processing and interpretation, making the data more convenient, intuitive and accurate. Combined with the engineering practice, we use and explore the feasibility of the method.
Application of the Rayleigh Wave Method in the Exploration of Construction on High Slope
Ding Yueshuang, Li Lianying, Liu Yuntao
2011, 25(3): 142-145. doi: 10.3969/j.issn.1007-2993.2011.03.009
[Abstract](34) [PDF 799KB](10)
Abstract:
The paper is a case study on a slope engineering project, it applied the Raleigh wave method into the manmade high slope during construction exploration. It obtained the data on depth of the base-rock in the slope zone, the thickness of the weathering zone, the shape of the slope surface, etc. With these data, it is possible to set the bore hole in the key positions along the "main slope part", the depth of the original slope surface has been checked as well. The conclusions of this paper is:the results from wave method generally fit the bore hole results, which shows the application of the Rayleigh wave method into the exploration of construction on high slope is a practical choice.
Application of Ground Penetrating Radar in Geotechnical Investigation Li Yuanqiang
Li Yuanqiang, Chen Wei
2011, 25(3): 146-149. doi: 10.3969/j.issn.1007-2993.2011.03.010
[Abstract](43) [PDF 861KB](8)
Abstract:
Ground penetrating radar is a kind of geophysical method which uses very high frequency pulse electrorongnetic wave to explore the distribution of underground medium. It is widely used in shallow geotechnical investigation with high efficiency and high resolution. Its effective is introduced by the project of G110 Road geotechnical engineering investigation. It is exactly to locate the fault and weathered layer. The radar data is scientific evidence in interpret the complicated geotechnical phenomenon.
The Study of Application of Integrated Exploration Method in Detecting Underground Broken Drilling Stem
Huang Laiyuan, Li Yuanqiang, Li Junhui
2011, 25(3): 150-153. doi: 10.3969/j.issn.1007-2993.2011.03.011
[Abstract](41) [PDF 732KB](5)
Abstract:
In drilling engineering the drop and the deviation of the drilling stem are the common accidents which are difficult to deal with. If the skew torlerance is too large to deviate from the design depth position, and the skew direction is difficult to judge, at the same time the drilling stem is possibly in the working area of TBM(Tunnel Boring Machine). This special case requires us to determine the specific skew position, once the drilling stem has deviated to the working area of TBM,we have to remove the drilling stem by all means.
Stability Analysis and Treatment of Xinlinxiang Slope in Dalian
Sun Shuheng
2011, 25(3): 154-157. doi: 10.3969/j.issn.1007-2993.2011.03.012
[Abstract](30) [PDF 669KB](4)
Abstract:
On the basis of detailed sutvey,an analysis is done of the geological conditions and stability of Xinlixiang slope in Dalian. the safety of each slope section dangerous sliding faces have been calculated with the laboratory test and experience parameter, and feasible management measure also have been proposed, It is inlicated from perating result after treatment foe two year that the analysis and calculation method and parameters selected can conform to the practical situation, measures are reliable, effect is good and slope is stable.
Application of Vacuum Preloading for Consolidation of Sott clay in Intertidal Zone of Lianyungang
Liu Huaqiang, Zhou Jinshan, Lu Mingzhi
2011, 25(3): 158-160. doi: 10.3969/j.issn.1007-2993.2011.03.013
[Abstract](29) [PDF 687KB](4)
Abstract:
The principle and the main step of treatment of soft soil in intertidal zone of Lianyungang with cacuum preloading are introduced in detailed through a case and the date of in situ monitoring is analysed deeply, The vacuum pressure of 80kpa is applied for about 100 days to consolidate the soft clay layer with thickness of 10rn. The settlement is about lm. The average degree of consolidation estimated according to the observation data is over 80 G. The undrained shear strength of the soil is elevated remarkably after vacuum preloading. The bearing capacity of the foundation basically reaches the requirement of construction, which show that the vacuum preloading technology is suitable for consolidation of soft soil in intertidal zone of Lianyungang.
Engineering Properties of Sedentary Soil at Left Dam Abutment of Yangzhuang Reservoir Project
Li Zhili, Gao Liye
2011, 25(3): 161-163. doi: 10.3969/j.issn.1007-2993.2011.03.014
[Abstract](45) [PDF 614KB](6)
Abstract:
The left dam abutment of Yangzhuang Reservoir Project contains large quantities of sedentary soils deteriorated from quartz dolomicrite,muddy and silty dolomite. These soils, which are characteristic of high moisture, low dry density and high porosity, are low in strength and highly compressible. They are not suitable as the underlying bedding of dam foundation. Excavation of these soils would increase the quantity and cost of the work. A particular study is performed on the engineering properties of the totally weathered rocks at the left dam abutment, with appropriate treatment measures proposed.

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