2004 Vol. 18, No. 6

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Study on the Composite Foundation of CFG Pile
Li Liangjing, Hua Jianxin
2004, 18(6): 271-274.
[Abstract](41) [PDF 189KB](9)
Abstract:
A series problems about the composite foundot io n of CFG pile are studied,such as design, construction and test, and some urgent problems in this field are proposed.
Improvement for Newton's Law of Viscosity and Darcy's Law
Xiong Daokun
2004, 18(6): 275-278.
[Abstract](41) [PDF 184KB](5)
Abstract:
Newton's Law of viscosiy is improved according to the Friction Law of motion and the Coulomb's Law of deformation and disrupture of object,and the Da rcy's Law is improved.The improved Darcy's Law is fited with the test data,the r easons for deviation of the Darcy's Law to the test data is illustrated.
The Constructional Technics of Post-inserted the Steel Reinforcement Cage in Bored Pile and Associated Equipment
Yang Yongxia, Gao Qian
2004, 18(6): 279-281.
[Abstract](60) [PDF 143KB](8)
Abstract:
The constructional technology of forming the pi le first and then inserting the steel reinforcement cage in bored pile is intrud uced and the principal,function,feature and application range of the constructio nal technology and associated equipment are discussed.
Discussion on the Experimental Material Analysis of Screw Plate Load Test
Zhang Haidong, Zhang Jinli, Hao Qingfen
2004, 18(6): 282-285.
[Abstract](55) [PDF 182KB](10)
Abstract:
Screw plate load test has incomparable advantage in obtaining the en gineering parameter of soil layer below groundwater level, however, there are several problems which need to be solved in terms of the sorting and analysis of experimental materials.On the basis of plenty of experiments, some beneficicl dis cussions on these problems are given.
Influence of Internal Radius of Ring Specimen on Tensile Strength of Rock
Liu Wenbin, Tang Chunan, Zhang Houquan
2004, 18(6): 286-290.
[Abstract](38) [PDF 271KB](5)
Abstract:
The uniaxial test and Brazilian test have been successfully simulated by using a numerical code named RFPA2D(abbreviated from Rock Failure Pro cess Analysis).Splitting tensile strengths of ring specimens with different int ernal radius are calculated and compared with others.The influence of internal radius of ring specimen on tensile strength is studied,the best ring specimen for testing tensile strength is determined and the relation between internal radius and tensile strength is drawn out by statistical method.
Test study on the Bearing Capacity of Cast-in-place pile with Branches & plates
Gu Aimin, Li Gang, Niu Minzhao
2004, 18(6): 291-294.
[Abstract](42) [PDF 190KB](5)
Abstract:
Through analyzing the bearing mechanism and the data of cast-in-place pile wit hbranches and plates,the bearing capacity of single piles is further studied by using different estimated methods.
Shallow Tunnel Construction Technology in Watery & Weak Straum
Huang Jun, Zhang Dingli, Chen Laisheng
2004, 18(6): 295-298.
[Abstract](29) [PDF 195KB](4)
Abstract:
STCM is used successfully in 23 Lot of Shenzhen Metro Phase Ⅰ Project and many technics have implemented in water, sandy & weak stratum, such as ground precipi tation, jet grouting waterproof purdah, geologic pre-predict, base substitute and so on. Tunnel passed two overbridge and sandy stratum safely with quick excav ating speed, good quality, small ground settlement and large economy benefit. Each measure, technics and difficulty of this project are introduced,and it is shown that STCM has a wide apply fonground in water sandy and weak stratum.
The Visualization of Calculation of Uniform Steel in the Cast-in-place Pile with Round Cross-section
Yang Chao, Yun Jun, Zhang Yingcai
2004, 18(6): 299-302.
[Abstract](41) [PDF 170KB](5)
Abstract:
On the basis of primary formulas of normal bearing capacity of concrete members with round cross-section subjected to eccentrically compressive loads, and considering the stress characteristics of the cast-in-place pile with round cross section in the engineering of foundation pit, the calculating formulas of uniform steel in the cast-in-place pile are deduced. Consequent ly, the corresponding calculating program is designed by visual software Delphi 6.0. And finally, with the validation of a practical example, it shows that this program is effective and accurate.
Three-dimensional Finite Element Numerical Analysis of Chamber Supporting in Swelling Soft Rock
Tao Xigui, Zhang Yao
2004, 18(6): 303-306.
[Abstract](41) [PDF 376KB](4)
Abstract:
Based on the theory of the humidity stress field, some swelling pr oblem of the underground chamber under the action of water is simulated effectiv ely by means of three-dimensional finite element numerical simulation. It shows thats the damage action of water and the self capability of swelling ro ck are important factors influencing the stability of underground chamber by analys is of some chamber supporting scheme. The mechanical effect of interaction betwe en water and swelling rock and effect of support is deeply known. At prese nt, the research can be provided as an efficient reference to the design and con struction for some underground chamber projects.
Analysis on Design Methods of Composite Foundation of Gravel Pile for the Liquefaction Resistance
Huang Chunxia, Zhang Hongru, Bai Shunguo
2004, 18(6): 307-310,314.
[Abstract](29) [PDF 226KB](8)
Abstract:
An evaluation of current design methods of composite foundation of gravel pile for the liquefaction resistance is presented.Also,an overview of cons truction techniques is briefly discussed.Based on analysis effectiveness of grav el pile for the resistance of soil liquefaction during earthquake,the effects of densification,drainage and seismic reducing should be included in a proper liqu efaction-resistance design method.
Geotechnical Character of Turfy soil in Dunhua Area,Jilin Prov ince
Zhao Hua, Nai Lei, Liang Bing
2004, 18(6): 311-314.
[Abstract](49) [PDF 195KB](5)
Abstract:
Turfy soil abounds in our country,which has so me characteristies,such as black-brown, swampy structured, high moisture conte nt,high organic content, high compressibility and shear strength higher than common soft soils. This soil's chanacteristics are systematically analyzed through field investigation and laboratory tests, including its site characters, components framework, physical mechanical properties, stratums forming ages and etc.
Research on Static Loading Test for the Cast-in-place pile of Large Diameter
Tang Junfeng, Tang Xuemei, Hu Xiangzhao
2004, 18(6): 315-319.
[Abstract](40) [PDF 414KB](6)
Abstract:
It's still the most reliable method of getting the ultimate bearing capacity of cast-in-place pile of large diameter by static loading test. The static loading test result is analyzed, such as the Q-s curve, axial force, side frictional resistance stress and bottom resistance st ress, and some useful conclusion are drawn, which can be used in the design and construction of the similar engineering.
Evaluation Factors of Fuzzy Evaluation on Expressway Foundation Treatment Schemes
Li Zhibin, Ye Guanbao, Xu Chao
2004, 18(6): 320-323.
[Abstract](36) [PDF 179KB](4)
Abstract:
Fuzzy Evaluation Method is a useful method in optimizing the design schemes for expressway foundation treatment,and it has some influemtial factors. The evaluation factors that influence the evaluating results are introduced firs tly,and then a practical example to illustrate the influence of the evaluation factors is put forward.

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