岩土工程技术

Study on The Foundation of Ancient Seawall in Qian Tang River

He Jun, Chen Zhenhua, Zhang Kaiwei

2013, 27(5): 217-221. doi: 10.3969/j.issn.1007-2993.2013.05.001

[Abstract](42) [PDF 2478KB](5)

Abstract:
The ancient seawall is utilized for preventing flood and tide at the Qiantang Estuary more than two hundred years. The phenomenon of soil flowing have been found at the toe of part seawalls. It is so necessary to select the reasonable reinforcement and keep the ancient seawall style scheme to reinforcing the seepage in foundation for protecting the ancient seawall. In this paper, taking Zhejiang Haining some ancient seawall based on the experimental section. We have researched four foundation seepage reinforcement schemes by field testing. We comparised of these schemes by the finite element computation, field permeability testing, excavation testing, and monitoring the deformation during the construction period. We analyzed and summarized the advantages and disadvantages of each reinforcement scheme. We know that the scheme of rotating jet grouting at the toe in foundation by restructuring part of machinery is more suiter then others.The research results will have important reference value for selecting the reinforcement scheme when the next step of Qian Tang river riverside ancient seawall protection engineering come.

Highway Surveying Engineering Common Types of Curvilinear Coordinates Mileage Calculation Method to Explore

Jiang Quan, Yao Peijun

2013, 27(5): 222-226,233. doi: 10.3969/j.issn.1007-2993.2013.05.002

[Abstract](53) [PDF 904KB](3)

Abstract:
This article unified the concrete example to introduce the current highway surveying project in the common type curve the line coordinates, the course, the curve element computation main technical method, the programming established and utilized the method, specially solved the both sides to insert the asymmetrical transition curve the circular curve median line computation, and unified the CAD cartography system to propose the corresponding solution.

Brief Analysis on Pumping Test of The Influence of Coastal Tidal

Huang Wei, Wang Zenghui

2013, 27(5): 227-229. doi: 10.3969/j.issn.1007-2993.2013.05.003

[Abstract](43) [PDF 1058KB](6)

Abstract:
Groundwater and seawater has strong hydraulic connection in the coastal area. In the process of pumping test, groundwater appear periodic fluctuation. In this paper, through the engineering practice, the analysis of the underground water level is affected by coastal tidal, and the measured curve of Q(S)-t is corrected, accurate hydrogeological parameter is obtained.

Research for Square Pit Water Inflow Calculation Methods

Kuang Nanshu, Zhang Jianjun, Cao Wenwen

2013, 27(5): 230-233. doi: 10.3969/j.issn.1007-2993.2013.05.004

[Abstract](58) [PDF 1138KB](9)

Abstract:
Through theoretical studies and practices analysis for water inflow of square pit, according to Darcy's law and Dupuit assumption,this article deduced the square pit inflow calculation method. By engineering example,the author analysed the applicability of calculation of this article'big well method and waterfall method for different pit type,and think this article's calculation method is more suitable for large aspect ratio square pit water inflow calculation.

Discussion of Drilling Method to Detect Center Location and Depth of Some Non-metallic Pipeline

Chen Zhuo

2013, 27(5): 234-237,258. doi: 10.3969/j.issn.1007-2993.2013.05.005

[Abstract](46) [PDF 752KB](7)

Abstract:
In the planning of urban underground space, the construction and maintenance of underground pipeline is very important. To achieve this, it is essential to acquire the information of the underground pineline, and the detection of the pineline is necessary,the difficulty of which is the detection of non-metallic pineline.To non-metallic pipeline with hard material and big diameter,the drilling method has been used to detect it.Based on the drilling method, two-drill method has been studied for determinating the center and depth of non-metallic pipeline. A software package has been developed and evaluated by practical applications. Results has shown the effectiveness of the proposed method.

Study for Key Technology of Metro Deep Foundation Pit Monitor in Loess Region of Northwest China

Wang Ting, Ding Jifeng, Zhang Delin

2013, 27(5): 238-241,262. doi: 10.3969/j.issn.1007-2993.2013.05.006

[Abstract](50) [PDF 1187KB](7)

Abstract:
This paper puts forward main content, the effect, common monitoring means of deep pit engineering based on four years experience of the first metro deep foundation pit monitor in the loess region of Northwest China. This paper introduces the key technology in axial force monitoring, displacement measurement by inclinometer, the layout principles of ground fissures surface points.This paper introduces the monitoring action and monitoring items of shield tunnel. Formation moving characteristics under shield construction and points for attention in monitoring alarm are put forward. This paper puts forward emphatically analyses points for attention and cause of abnormity in rigid supporting axial force monitoring.It is the most common method of internal bracing in the loess region of Northwest China. This paper puts forward that, the influence of temperature action on rigid supporting axial force monitoring can not be neglected.

Review on Study of Safety Evaluation Methods of Rock-soil Slopes Seismic Stability

Xian Yujian, Chen Xuejun

2013, 27(5): 242-247. doi: 10.3969/j.issn.1007-2993.2013.05.007

[Abstract](71) [PDF 822KB](6)

Abstract:
Earthquake-induced rock-soil slope landslides occur frequently, so the safety evaluation method as the basis of the analysis of rock-soil slope seismic stability is particularly important. Firstly, the classification of safety evaluation methods for rock-soil slope seismic stability were analyzed and discussed. Secondly, from the perspective of safety evaluation methods divided, this article made a brief review and comment on the progress of safety evaluation methods of rock-soil slope seismic stability. Finally, the article pointed out several outstanding issues need to be solved, and put forward views on the future research direction.

Engineering Behavior of Coral Sands in Dili,Timor-Leste

Tang Guoyi, Xia Yuyun, Liu Zhenghong

2013, 27(5): 248-251. doi: 10.3969/j.issn.1007-2993.2013.05.008

[Abstract](41) [PDF 1220KB](7)

Abstract:
Coral sands,one kind of the coral clastic soil,is a special soil with the properties of porosity,weak rigidity and friable.Because coral reefs only exist in tropical skerry and far away from mainland,there are fewer researches about coral reef rock or soil and it is not mentioned in current Chinese standards.Based on real project in Timor-Leste,this paper discusses some engineering behavior of coral sands.Depended on the in-situ test results such as SPT and drilling shear wave velocity test and using the current evaluation methods for engineering properties of quartz sands for reference,the strength properties and seismic liquefaction characteristics of coral sands are discussed.Compare with the quartz sands,coral sands has a lower SPT blow count with higher shear wave velocity, and there is a high risk of liquefaction on coral sands.

Foundation Reinforcement for the Anneal Workshop of A Carbon Plant

Li Jianbin, Kang Xuetao, Xia Feixue

2013, 27(5): 252-255. doi: 10.3969/j.issn.1007-2993.2013.05.009

[Abstract](39) [PDF 1112KB](4)

Abstract:
The rising of fill moisture caused the foundation collapsible sinking. Meanwhile, the steel pipes of carbon rotary kiln bending effected normal operation of the line. Using the cement water glass slurries and inclined hole, we grouted in layers to the middle fills of the dust sedimentary chamber. Based on the bottom-enlarged grouting piles which are longer than original piles, we reinforced the foundation of rotary kiln. All the above prevented the sinking of the foundation and up to now the rotary kiln worked very well.

Effects and Improving Measures of Hydraulic Fill to Vacuum Preloading Foundation Treatment

Li Yucan, Xie Wulin

2013, 27(5): 256-258. doi: 10.3969/j.issn.1007-2993.2013.05.010

[Abstract](29) [PDF 743KB](4)

Abstract:
The research bases on one project of a southern shipyard.It analyses the data of the settlement and penetration test in the foundation treatment combining with the questions occurred in hydraulic fill.The main factors of hydraulic fill makes on the vacuum preloading foundation treatment and the measures to improve it are proposed.

Experimental Research on Construction Technology of Vibroflotation Pile in Saturated Sandy Liquefaction Area with Large-thickness

Li Jichao, Sang Youming

2013, 27(5): 259-262. doi: 10.3969/j.issn.1007-2993.2013.05.011

[Abstract](38) [PDF 615KB](8)

Abstract:
The program of gravel piles with vibroflotation is used to handle the liquefaction of large-thickness saturated sand foundation. In this program, the pile effect of different types of vibrator is discussed, the different pore-forming auxiliary ways and pile filler methods are tested, frequently asked questions in construction, such as "holding hole",vibrator fallen,virtual height etc., are analysed and the preventive measures are suggested in order to discuss on the construction process, improve construction efficiency, reduce security risks, provide some reference for the similar engineering.

Application of Micro Steel Pipe Piles in Soft Soil Region

Zhou Liping, Li Qiannan, Li Jiehan

2013, 27(5): 263-266. doi: 10.3969/j.issn.1007-2993.2013.05.012

[Abstract](59) [PDF 1133KB](9)

Abstract:
Based on the result of the micro steel tube pile test, it shows that the dosage of the cement and gravel in micro steel pipe piles during foundation reinforcement construction, and the key to guarantee the reinforcement effect by the secondary grouting. The micro steel tube pile head seems like a expanded pin in rubble filled region, which can obviously increase the pile and the bearing capacity of foundation, and reduce subsidence as well.

Application of Soli-lime Combining with Cement-Flyash-Gravel Pile for Tall Building Ground Treatment

Kong Lingjian

2013, 27(5): 267-271. doi: 10.3969/j.issn.1007-2993.2013.05.013

[Abstract](33) [PDF 1682KB](8)

Abstract:
Introduced soli-lime combining with cement-cement-flyash-gravel pile for tall building's ground treatment.The ground treatment design, construction, deformation calculation,inspection,deformation monitoring results show that the ground treatment design can meet the requirements of the tall building.The analysis results provide a reference for other similar projects.

2013 Vol. 27, No. 5