岩土工程技术

Research on Nanning No.1 Subway Geotechnical Engineering Investigation in Swelling Rock

HUANG Zhong-hui, TANG Ying-chun, YANG Lei

2015, 29(1): 1-4,13. doi: 10.3969/j.issn.1007-2993.2015.05.001

[Abstract](33) [PDF 1197KB](11)

Abstract:
Analyzing the engineering geology and hydrogeological conditions of tertiary mudstone in Nanning,and combining with the characteristics of the Nanning subway,geotechnical engineering investigation methods and test projects and the relevant matters on swelling rock area of Nanning rail transit line 1 were discussed Content of detailed geotechnical investigation about space between boreholes and site description on the swelling rock area across in Nanning rail transit line 1 have been presented;it suggested that authentication on rock mineral,water absorption and saturate water absorption test,slake-durability test,swell ability test could be added into laboratory soil test;ground stress test,K₃₀ coefficient of subgrade reaction in field testation,immersion static load field test and horizontal swelling force test is suggested into in-situ test.Some advises aiming at certain geotechnical investigation such as K₃₀ coefficient of subgrade reaction in field test,thermal physics indexes and horizontal swelling force were presented.

Study on Stability Evaluation Method of Slope Retaining Wall Based on AHP

WU Shu-tian

2015, 29(1): 5-8,45. doi: 10.3969/j.issn.1007-2993.2015.05.002

[Abstract](42) [PDF 2246KB](15)

Abstract:
Slope retaining wall is adjacent to the slope.The stability is not only restricted by its own structure and quality,but also affected by nearby geological environment.A lot of this type of retaining wall is distributed in Zhuhai Wanshan District.And multiple wall collapses,bring economic losses,influence is serious.So this paper uses AHP method to analyze and evaluate the stability of slope retaining wall.

Application of VBA in the Batch Processing of Pile Foundation Inspection Data

WANG Xiao-bo, ZOU Chao-qun, DENG Mei-cheng

2015, 29(1): 9-13. doi: 10.3969/j.issn.1007-2993.2015.05.003

[Abstract](43) [PDF 823KB](10)

Abstract:
Engineering data usually needs to be batch processed from Excel to Word,in order to make full use of the powerful function of data processing and analysis in Excel and the strong ability of text processing and typesetting in Word.When the amount of engineering data information is large,the working capacity will be also very large by using the traditional manual editing method.Furthermore,the operating and processing are repetitive,time consuming and error prone.In the paper,a VBA programming method of Microsoft Office software is employed to realize the automatic batch processing for the mass inspection data of large-scale pile foundation.With the proposed method,the timely and accurate data is provided for the pile foundation inspection,which improved the working efficiency and has the important application value.

Stress Calculating and Site Measuring for Jacking Steel Tube

CHEN Ji-guang, QU Yan

2015, 29(1): 14-16. doi: 10.3969/j.issn.1007-2993.2015.05.004

[Abstract](32) [PDF 741KB](13)

Abstract:
By theoritical analysis and on-site monitoring,this paper presents new method for stress pre-estimating and monitoring during steel tube jacking.

The Application of Rigid-Flexible Pile Composite Foundation in Caofeidian Dredger Fill Venues

ZHANG Wen-xiu

2015, 29(1): 17-21. doi: 10.3969/j.issn.1007-2993.2015.05.005

[Abstract](32) [PDF 756KB](12)

Abstract:
Caofeidian coal storage and distribution of digital base project construction site is formed by land reclamation,the upper part is weak and has a moderate layer of liquefied land reclamation,and the proposed structure of the foundation of strength and deformation are demanding,the foundation bearing capacity required to achieve 320 kPa,deformation control demanding.Stratigraphy and structures for such characteristics,the design made using rigid-flexible piles composite foundation program,combining the advantages of both method,the flexible pile reinforced soil between piles effectively,eliminated negative friction resistance and liquefaction;rather rigid pile provided a substantial increase in bearing capacity and sedimentation control.This paper describes the design concept of the rigid-flexible piles composite foundation,the calculation patterns of bearing capacity and settlement,through specific examples of projects,introduce design program and experimental construction,described the advantages and applications of the method.Practice has proved that the rigid-flexible piles composite foundation has good economic and social benefits,similar projects in similar areas worthy of large-scale application.

Further Study of Settlement Deformation for Pile Unit Model on FLAC 3D

YIN Chen-peng, ZHANG Huai-jing, SUN Hong-wei

2015, 29(1): 22-27,37. doi: 10.3969/j.issn.1007-2993.2015.05.006

[Abstract](47) [PDF 1289KB](17)

Abstract:
In order to further verify the correctness of pile unit model,comparing the results of settlement deformation,which is based on the finite element analysis software FLAG 3D,with the results of PLAXIS 3D and measurement data of settlement.At the same time,by comparing the operation process of FLAC 3D and PLAXIS 3D,there are some advantages and features about the two software that can provide a basis to select appropriate numerical analysis software for future engineering.

Design and Construction of Foundation Treatment in Beijing Pit Backfill Engineering

ZHOU Jun-hong, LIU Bo, WEI Hai-tao

2015, 29(1): 28-32. doi: 10.3969/j.issn.1007-2993.2015.05.007

[Abstract](47) [PDF 894KB](12)

Abstract:
Through a project example of Beijing,introduces united foundation treatment design of the soil backfill of dynamic compaction in layers and CFG pile composite foundation in the pit backfill engineering,and through the late settlement observation data analysis proves that the method is feasible and economic reasonable of the pit engineering,provides a successful example of application in design the project is similar to the pit.

Application on Ground Improvement for Soft Soil Foundation of Large-Area

WEI Jian-hua

2015, 29(1): 33-37. doi: 10.3969/j.issn.1007-2993.2015.05.008

[Abstract](51) [PDF 714KB](16)

Abstract:
Two technologies of impact roller method combing with well-point dewatering and stacking load pre-compaction combing with deep-well dewatering are introduced in this paper based on a ground improvement project in Shanghai.This method not only meets the requirements on project progress but also meets quality requirements.The effectiveness is also discussed.All the results given are of great practical value for similar soils improvement in future.

Application of the Supporting Method Combined by Preloading Underpinning Pile and Soil Nailing in a Foundation Pit

LEI Ke-na, ZHANG Ling, ZHAO Lai-shun

2015, 29(1): 38-41,50. doi: 10.3969/j.issn.1007-2993.2015.05.009

[Abstract](30) [PDF 1349KB](10)

Abstract:
Combined with practical engineering,the supporting method combined by preloading underpinning pile and soil nailing was introduced,including the mechanism,design method,construction process and the application results.Through the application result in the practical engineering,it can be concluded that supporting method was effective to the engineering of foundation pit adjacent to the existing building.The result can be referenced by the similar projects.

Application of Anchor Piles in Foundation Pit with Deep Fills

WEI Hai-tao, LIU Huan-cun, MA Yong-qi

2015, 29(1): 42-45. doi: 10.3969/j.issn.1007-2993.2015.05.010

[Abstract](39) [PDF 819KB](18)

Abstract:
Based on the engineering application of anchor piles in a foundation pit with deep filling soils,the design parameters,the procedures of design and calculation of this supporting structure are introduced.The results of numerical simulation and site construction monitoring shows that the supporting method can effectively control deformation of foundation pit,insure the safety of foundation pit and underground strcture construction.And it provides a reference for the similar projects.

A New Method of Pile Anchor Connection-Bilateral Support Method

HAN Feng-xia, TIAN Shu-yu, YANG Xiao-peng

2015, 29(1): 46-50. doi: 10.3969/j.issn.1007-2993.2015.05.011

[Abstract](52) [PDF 1318KB](13)

Abstract:
This passage mainly elaborated a new-type power transmission device applied to foundation pit and slope supporting engineering-bilateral support method.Meanwhile the passage discussed disadvantages of the waist beam method commonly used at present in detail,improved it and put forward new construction method thus it is of high practical and promotional value in foundation pit supporting engineering.

Large Scare Steel Structure Installation Monitoring Using Insensitive Temperature FBG Technology

ZHOU Yuan, CAO Hai-jun

2015, 29(1): 51-54. doi: 10.3969/j.issn.1007-2993.2015.05.012

[Abstract](24) [PDF 996KB](10)

Abstract:
Currently,Fiber Bragg Grating which has become a new way of monitoring and detecting has the feature of removing electromagnetic interference,high sensitivity,environmental adaptability,long life in the filed of strain monitoring of bridge,steel structure,etc.But the FBG wavelength shifts with temperature changing has greatly affected the property of monitoring systems.It is necessary to using FBG temperature compensate technology.Combining a certain project of steel structure,this article referred to a new FBG senor and described its insensitive temperature technology can accurately strike off the affection of temperature.It has achieved the aim of long-sterm health monitoring.

2015 Vol. 29, No. 1