岩土工程技术

Zhang Jiwen, Zheng Jianguo, Zhang Kai

2016, 30(1): 1-5. doi: 10.3969/j.issn.1007-2993.2016.01.001

[Abstract](40) [PDF 1060KB](20)

Abstract:
This paper reviews the main achievements characteristics of geotechnical engineering testing and monitoring technology used in The Seventh Session of National Geotechnical Engineering Records,analyses the application and research results of regular geotechnical engineering in-situ testing and monitoring in recent years,and introduces the advancements and application of some testing technology,including in-situ penetration,sliding micrometer,fiber optic monitoring and three-dimensional laser scan technology.

A Study on the Feasibility of BIM Application in Ground Investigation

Dai Yiming, Ren Yu

2016, 30(1): 6-11. doi: 10.3969/j.issn.1007-2993.2016.01.002

[Abstract](121) [PDF 3073KB](58)

Abstract:
The Feasibility of BIM application in ground investigation is discussed in this paper.According to intensive research and engineering practice,the author proposed goals,ways and stages of solution of BIM application in ground investigation.

Key Technical Issues and Engineering Practices in Project Construction of Loess Deep Filled Foundation

Zhang Wei, Zhang Jiwen, Yu Yongtang

2016, 30(1): 12-19,38. doi: 10.3969/j.issn.1007-2993.2016.01.003

[Abstract](132) [PDF 3122KB](56)

Abstract:
The main characteristics of deep filled foundation in hilly-gully regions are complicated topographic and geomorphic conditions,complex geological environment,accompanied with large area of collapsible loess and soft alluvial soil,massive earthworks volume,various influencing factors and limited construction period.The problem of stabilization,sedimentation,drainage,slaking distortion-controlling,slope protection and so on is involved in the construction of loess high fill foundation.The practice in dealing with the problem of the deformation and stability of deep cut and deep filled foundation in the hilly-gully regions of loess plateau are introduced by taking typical projects for example.The construction methods consist of comprehensive evaluation of engineering geological conditions,optimizing the excavation-fill balancing,constructing the effective underground water drainage system,reinforcing of the original foundation soil by dynamic compaction,compacting(or dynamic compacting) of the loess filling,effective treatment of the fill slope and the cut slope,controlling the construction with quality inspection by three-dimensional method,and evaluation of the deep filled foundation condition by geotechnical engineering monitoring throughout construction period etc.The key techniques can also be used to similar projects as reference.

The Shear Strength Research on Rock-Soil Mixture Material of Weathered Granite Blocks and Residual Soil after Dynamic Compaction

Zhang Kuangcheng, Zhu Jiebing, Chen Ming

2016, 30(1): 20-23,45. doi: 10.3969/j.issn.1007-2993.2016.01.004

[Abstract](59) [PDF 1022KB](14)

Abstract:
A high slope,with height up to 44 m and length up to 2600 m,was filled with the rock-soil mixture material of weathered granite blocks and residual soil after dynamic compaction in Zhuhai.China.The design of slope needs the shear strength of the mixture material.The large-scale in-situ direct shear test was carried out and the strength parameters are as follows:angle of internal friction φ=38°,cohesion c=101.4 kPa,angel of internal friction and cohesion between fill material and natural ground,φ=39.1°,c=108.9 kPa,respectively.The special research on the mixture material shows large cohesion values after dynamic compaction.It can be explained that granite rock-soil mixture material total cohesion consists of the shear cohesion of strong weathered rock,the residual soil's original clay cohesion and the stabilized cohesion after compaction.

Effects of Sand Foundation Density on Scale Effect in Bearing Capacity Centrifugal Model Tests

Qian Weiwei

2016, 30(1): 24-27. doi: 10.3969/j.issn.1007-2993.2016.01.005

[Abstract](46) [PDF 1475KB](12)

Abstract:
In this paper,the relative density of 34%,78%of the sand foundation bearing capacity on the basis of centrifugal model test round,the basis of size effect on the relative density of phase with the variation of quantitative discussions to determine the density and stress level sand foundation dependent coefficient and scale effect based on the width limits of specific correspondence.Through this study,to determine the stress level dependence coefficient,based on the scope and size effect of the specific density of sand foundation correspondence.In the capacity tests,according to different density of the foundation,choose a different base size in order to avoid the scale effect.At the same time the basis for the existence of size effect of situation can also be used to compare the test results this exact amendment to eliminate the scale effect.

Automatic Generation Method of Cross-Platform Drillhole Histogram

Wang Youlin, Wang Jianming, Cheng Xinxing

2016, 30(1): 28-32. doi: 10.3969/j.issn.1007-2993.2016.01.006

[Abstract](39) [PDF 1186KB](10)

Abstract:
The drillhole histogram drawn by traditional method are usually limited to specific software platform,such as AutoCAD,and are difficult to achieve cross-platform and network application.In this paper,through the design of general drillhole data model and the design and implementation of algorithm on filling drillhole histogram with the lithology pattern,the drillhole histogram data set including vector graphics and graphic description attribute is created.The data set is stored by standard data exchange format which is independent of programing language and software,can be applied to a variety of application platform,such as local desktop applications,PC internet and mobile internet,can achieve the "write once,run anywhere" goal of cross platform application.This paper takes a pratical project as an example to introduce these contents.

The Characteristic Analysis and Treatment Measures of Thick Collapsible Loess of the Northwestern of Shanxi Province——Take an Alumina Plant Site in Baode County of Shanxi Province as the Example

Wang Xiaoqiang

2016, 30(1): 33-38. doi: 10.3969/j.issn.1007-2993.2016.01.007

[Abstract](47) [PDF 1153KB](9)

Abstract:
In this paper,an alumina plant site in Baode County of Shanxi Province is taken as an example.It shows that this area is mainly Quaternary Holocene(Q_4),the Pleistocene(Q_3) and the Pleistocene(Q_2) of aeolian and talus deposits,particles are mainly composed by fine sand and silt(particle size 0.25~0.01mm),by processing,counting and analyzing of 648 set of experimental data and combining with the engineering geological conditions of local.In which the thickness of loess layer is 15~30 m,collapsible type is self weight collapsible,collapsible grade is Ⅱ~Ⅲ,it is a middle-serious collapsible loess ground.The difference of the mechanical properties is great in the natural state and saturation state,therefore,the loess layer is hardly entirely cleared up by general measures.The use of immersed tube into the holes and hammer secondary Compacted Piles are ableto handle all of the loess and the effect is well.

Spatial Deformation Analysis of Urban Deep Excavation

Zheng Wei, Yuan Jianbin

2016, 30(1): 39-42. doi: 10.3969/j.issn.1007-2993.2016.01.008

[Abstract](44) [PDF 937KB](7)

Abstract:
Based on the deep excavation of Beijing Friendship Hospital,this paper combined with deformation data of field measurement and simulation to pile-anchor bracing system with FLAC3 D,comprehensively analyzed deformation of excavation and the surrounding ground surface.It provides basis for deep excavation design in complex architectural environment.

Data Processing of Survey of Land Use Status in Towns

Chen Zhuo, Liu Xiaoguang

2016, 30(1): 43-45. doi: 10.3969/j.issn.1007-2993.2016.01.009

[Abstract](33) [PDF 616KB](7)

Abstract:
Taking Tianjin urban land use survey data as the processing object,analyzed the characteristics of the original CAD data and target of SHP data,using AutoCAD Map 3D 2010 and ArcEngine9.3 technology,a series of tools and procedures have been developed based on language C#,solved a series of data conversion,number according to the error checking and handling the problem for large area land use survey data processing has great practical significance.

Discussion on the Calculation Method of the Stability of the Ancient Architecture of Rammed Earth

Liu Bo, Ma Dayan, Wang Zhanlei

2016, 30(1): 46-49. doi: 10.3969/j.issn.1007-2993.2016.01.010

[Abstract](36) [PDF 4516KB](10)

Abstract:
The ancient architecture is the common wealth of mankind,for the construction of ancient buildings,the construction technology,building materials and modern architectural differences,coupled with the old,so how to protect the ancient architecture has been the common problem in engineering field.China's ancient architecture mainly uses the stone masonry,wood structure,the city wall structure,mainly by the rock structure,but also to earth up,the main reason is convenient for construction,long construction time;for,as well as the destruction of mankind,the stability of the rammed earth buildings are now facing a severe test.There have been different views about how to accurately evaluate the stability of existing rammed earth structure.Through the research of the ancient city of Hebei province,the ancient city wall and the structure of the Great Wall station,the author put forward own views on the stability calculation of this kind of rammed earth construction,and is willing to discuss and study with colleagues.

The Example Analysis for Design and Construction of Deep Excavation Project in Beijing

Zhang Chaowen, Yuan Ye

2016, 30(1): 50-54. doi: 10.3969/j.issn.1007-2993.2016.01.011

[Abstract](29) [PDF 988KB](14)

Abstract:
In recent years,with the rapid development of economy and city construction in our country,especially of large and medium-sized cities in China,the top and tall building has been developing rapidly,and many high-rise building deep basement,so the design and construction of deep foundation pit supporting is particularly important.Based on a deep excavation project in Beijing,from design,construction and monitoring of the foundation pit engineering in three aspects,this paper summarizes the region experiences and lessons in the process of design and construction of foundation pit,serve as a reference for similar engineering design and construction.

2016 Vol. 30, No. 1