岩土工程技术

Application of MODFLOW in Analysis for Prevention of Up-floating of Beijing

LIU Chun, LIU Peipei

2010, 24(1): 1-5. doi: 10.3969/j.issn.1007-2993.2010.01.001

[Abstract](33) [PDF 299KB](6)

Abstract:
Introduce some achievement of the aspect that the buoyancy studies of the underground structure. MODF-LOW is applied to numerical simulation to analysis and demonstrate, combining with the concrete project, We suggest that the groundwater level for prevention of up-floating, reduce the investment to anti-uplift.

The Discussion About the Settlement Calculation of DJM Pile Composite Foundation

KONG Xiangguo

2010, 24(1): 6-9,19. doi: 10.3969/j.issn.1007-2993.2010.01.002

[Abstract](48) [PDF 396KB](6)

Abstract:
The settlement calculation accuracy of composite foundation is depended on the choice of the calculation method, the various types of calculation methods are established from different angles and hypothetical model, and it is the different between the actual working condition. The work of the mechanism and failure mechanism of DJM Pile composite Foundation are analyzed in the article, and various calculation method are compared, the ideas of selection and improvement method of the settlement calculation are put forward.

New Construction Methods in the Consolidation and Enlargement of -4. 5m Long Yan Port of Xixiakou

LI Fang, WANG Hongwei

2010, 24(1): 10-11. doi: 10.3969/j.issn.1007-2993.2010.01.003

[Abstract](38) [PDF 140KB](5)

Abstract:
The thesis, taking the construction work of the consolidation and enlargement of -4.5 m Long Yan Port as an example, elaborates on the feasibility and the method of using the triple-pipe jet grouting pile as the bottom-holder, reinforced pile, together with the anchored steel pipe pile in port construction work, so as to provide certain experience and reference for similar projects.

Research and Development on Design Computing System of Lattice Girder

CENG Yonghui, LIU Ya

2010, 24(1): 12-15,43. doi: 10.3969/j.issn.1007-2993.2010.01.004

[Abstract](32) [PDF 385KB](6)

Abstract:
As a new slope protection system, Lattice girder has been widely used in the current engineering practice, but presently lattice girder calculation will be split into single beam in the engineering design, with using the manual calculation and the hand drawing, overlooking the characteristics as a whole framework, whose design quality and design speed are not satisfactory. Based on the considerations above, the cross-based design method is used to solve the problem, which discusses the load distribution on vertical and horizontal girder, and the internal force of lattice beam is computed by Winkler elastic foundation beam theory. On this basis, internal force calculation, reinforcement calculation and construction drawings are set to be integrated, establishing the flowchart of design computing system on lattice girder, then the design calculation procedures is developed by visual programming language visual basic with CAD secondary development, and the Intelligent and integration on lattice girder design is realized.

Study on the Formation Mechanism and Stability of Sichuan Guangyuan Wangjiabao Landslide

ZHANG Dan, ZHAO Zhiwei, LI Yan

2010, 24(1): 16-19. doi: 10.3969/j.issn.1007-2993.2010.01.005

[Abstract](37) [PDF 318KB](5)

Abstract:
Wangjiabao Landslide is located in the northern Sichuan Basin,Guangyuan. The sign of landslide deformation is mainly to surface deformation. In this paper, qualitative analysis and quantitative analysis are used to landslide stability analysis and calculation. The results show that Wangjiabao landslide is stable in natural condition or seismic condition and basically stable in storm condition. Based on the above results, a reliable basis for the prevention and treatment project is provided.

Research on the Upper Bound Solution of Circle Tunnel in Clay

YIN Xiaojun

2010, 24(1): 20-23. doi: 10.3969/j.issn.1007-2993.2010.01.006

[Abstract](44) [PDF 206KB](4)

Abstract:
Base on Daris at al tunnel failure model and the upper bound theory of plastic limit analysis, a new parameter aequal to 1, governing size of shear zone of tunnel failure model was put forward. The velocity of shear zone and formula of line of discontinuity was applied in using incompressibility condition and velocity continuity condition, deducing energy dissipated on the line of discontinuity, energy dissipated within shear zone and total the work done by the outside force of the model Expression of stability ratios got by applying conversation of energy theory, from the result standpoint, the upper bound solution is smaller than Davis et al the results, thus the upper bound solution to be closer the real solution. From the standpoint of the experimental results comparison, the upper bound solution is located nearby the experimental value, which can agree with experimental results, thus the model is closer the real failure tunnel. The upper bound solution would provide the theory basis of the tunnel support.

RingJiaozhou Bay Highwaybridgepile Foundation of a Special Program

ZHANG Zhenduo, LI Yancheng

2010, 24(1): 24-27. doi: 10.3969/j.issn.1007-2993.2010.01.007

[Abstract](29) [PDF 222KB](4)

Abstract:
Under the condition of the same stratum of buildings and public works facilities, the rationality of the pile foundation design and the choice of pile-type will be significant difference for the maximum of pile capacity. In the bridge pile foundation engineering practice for the high road ring Jiaozhou Bay, we analysis the rock conditions of pile bearing stratum, and propose design change recommendations for using the design of friction pile in the bedrock strata. When the friction pile formula changed for axial pressure bearing capacity of single pile to calculate, because the bottom of pile tip resistance play a important role, the long friction piles designed can be reduced dramatically. It does not only save the project cost, but also reduce the technical difficulty of large diameter ultra-long piles construction in hard rock formation to reduce the duration, the bridge complete ahead of schedule have a very important economic significance for the high road. The bridge completed for many years, it proof that the ideas of change pile design is correct, and the bridge is security and stability.

Landside Inclinometer Data Processing Applied Research

SU Zhaofeng, SUN Zengwei, CHEN Changyan

2010, 24(1): 28-31. doi: 10.3969/j.issn.1007-2993.2010.01.008

[Abstract](31) [PDF 472KB](5)

Abstract:
At present, landside is becoming more and more serious in my country. It causes great harm to the national economy and the safety of people health. Landside monitoring survey is particularly important to manage the landside. The inclinometer as a kind of precise and efficient technology is widely used on the landside monitoring survey. Through long term monitoring inclinometer of five hole in Shuangda road landslide of Mentougou distract, on the detail basis of the inclinometer principle, it analyses the raw data systematically. Then the article calculates the direction displacement, synthetic displacement, synthetic angle, displacement rate of each point depth. Finally, it summarizes their mutual relations and the change regularity, and confirms the exact depth and the direction of the slide. The monitoring results provide the scientific basis for the latter management of the slide.

Analysis of Slope Stability under Earthquake

FAN Zhaoping, ZHANG Lihua

2010, 24(1): 32-35. doi: 10.3969/j.issn.1007-2993.2010.01.009

[Abstract](28) [PDF 235KB](7)

Abstract:
Dynamic fininte element methodand time history analysis are explored to analyze dynamic property of slope during seismic process considering soil dynamic property and seismic proerty. The minimum mean safety factor is explored to evaluate slope stability. The result is compared with the one of the pseu-static method. The result of the typical slope indicates that the method is feasible.

The Study on Mechanism of Phosphogypsum Karst Development and Engineering Treatment

XU Jin, WANG Honglian

2010, 24(1): 36-39. doi: 10.3969/j.issn.1007-2993.2010.01.010

[Abstract](38) [PDF 283KB](4)

Abstract:
Phosphogypsum can be corrosioned directly by the water. The special crystal shape and impurity of phosphogypsum also affect its dissolution feature, which brings phosphogypsum karst phenomena. The influence of compound karst of the phosphogypsum pilling up the carbonate rocks area will bring hydrology, engineering geology questions. The phosphogypsum Karst is a special question that affects the stability of stack, dam and ground water environment. Some engineering treatment countmeasures about enhancing stability of phosphogypsum dam, prevent leakage of stack and protect the ground water environment be gived.

Application of HGP Pile to Ground Treatment

HE Ruixia, JIANG Yantao, WANG Nengmin

2010, 24(1): 40-43. doi: 10.3969/j.issn.1007-2993.2010.01.011

[Abstract](34) [PDF 312KB](5)

Abstract:
The design calculation and construction process of HGP pile composite foundation were introduced by engineering example. It was explained that HGP pile can improve foundation strength and control foundation deformation by test result on site. HGP pile has the following characteristics: the construction tools are convenient, the maneuverability is strong, the cost is low and the site condition is not restricted etc. HGP pile has very good promotion application value.

Timber Pile was Applied to Treat Prefabricated Tube Pile Quality Accident

ZHU Kui, XU Riqing, ZHOU Pengfei

2010, 24(1): 44-47. doi: 10.3969/j.issn.1007-2993.2010.01.012

[Abstract](23) [PDF 252KB](5)

Abstract:
Engineering project in which timber pile was applied to treat prefabricated tube pile quality accident was introduced. Test results after construction completion indicated prefabricated tube pile bearing capacity dropped to much degree, reinforcement plans were compared according to location geology situation, and composite foundation with timber pile and prefabricated tube pile was adopted to deal with pile quality accident, the reinforcement parameter in design process was elaborated in detail, and foundation settlement after reinforcement was analyzed. What's more, deformation observational data after building completion indicated reinforcement effect was good, timber pile is adopted to deal with pile quality accident is feasible in the aspect of economics and technology.

Cause Analysis and Prevention of Damage of Drill Cast Pile of an Engineering Subject in Sudan

WANG Lixin, LI Kunpeng

2010, 24(1): 48-50,54. doi: 10.3969/j.issn.1007-2993.2010.01.013

[Abstract](37) [PDF 310KB](7)

Abstract:
Common pile quality faults such as pile break, cross shrink, pile end damage are often met in sand stratum. Short of design elevation and damage of drill cast pile in Sudan Nile bank constructed by spin-dig borer are discussed in this paper. Developing process, cause and experience of these pile quality faults are also demonstrated and measurement of preventing fault is put forward.

Construction Method of Cast-in-place Pile Post Grouting

CHEN Lixin, SHU Bin, YANG Zongyao

2010, 24(1): 51-54. doi: 10.3969/j.issn.1007-2993.2010.01.014

[Abstract](44) [PDF 316KB](7)

Abstract:
This method introduced the technology features of cast-in-place piles post grouting, principles of technology, operations and quality control measures, elaborated on the open-grouting technology with the traditional distinction between a closed grouting process, encapsulated the technology experience and results of cast-in-place pile post grouting technology applications in recent years.

2010 Vol. 24, No. 1