2007 Vol. 21, No. 6

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Strength Calculation of Cement-soil Mixing Pile Composite Foundation in the Multi-tier Soil
Wu Baoquan, Li Tianbin
2007, 21(6): 271-274,278.
[Abstract](66) [PDF 417KB](14)
Abstract:
In the compressive strength design of cement-soil mixing pile composite foundation, the design of the compressive strength design of cement-soil mixing pile of a soil is provided. But, the design of the compressive strength design of cement-soil churning pile of multi-tier soil is not available in the code. Based on the engineering practice, a new calculating method of compressive structural strength of the pile in the multi-tier soil is put forward.
3D Finite Element Simulation Analysis on Tunnel Shield Driven Process
Zhang Guoying, Fu Guoli
2007, 21(6): 275-278.
[Abstract](67) [PDF 316KB](10)
Abstract:
Based on the three-dimensional nonlinear finite element model, the applying method for simulating shield tunneling and transverse force at tunnel face is modified. And the advancement process of shield tunnel is modeled by the transferring stiffness of the established elements and the gap caused by tail void are substituted by ‘equivalent circle zone’. The proposed modeling techniques are applied to simulate a tunneling project. The distributions of soil displacement on the ground surface associated with the advancement process of shield tunnel are analyzed. According to the comparisons of numerical results with field measurements, the proposed numerical procedure is found to be an effective approach for predicting the deformation dun to shield tunneling.
Deformation Monitoring and Inverse Analysis of Deep Foundation Pit of Gangwan Plaza(Phase 1)
Shi Hansheng, Zhou Nianqing, Zhou Hongbo
2007, 21(6): 279-284.
[Abstract](53) [PDF 543KB](12)
Abstract:
Deformation monitoring of deep foundation pit is an important content of information construction. In the excavating process of the deep foundation pit project of Gangwan Plaza (Phase 1), according to the horizontal and lateral displacement, internal stress of support structure, subsidence monitoring and so on, combined with intensity detection of perimeter structure, use inverse analysis method to simulate foundation numerical deformation, and forecast foundation pit deformation at different depth. The actual monitoring result is consistent with the forecast value basically, and the reliable basis is provided for foundation pit design and construction.
Practice of Many Apparatus Teamwork in Engineering Survey
Shi Juncheng, Liu Xin
2007, 21(6): 285-287,312.
[Abstract](41) [PDF 401KB](7)
Abstract:
The teamwork of GPS-RTK and total station are discussed combined with the concrete survey of path of Olympics Mountain Bike. Especially, the advantage and significance of manifold apparatus teamwork are attested by using RTK, which satisfied requirements of survey accuracy completely.
Current Velocity Calculation of Debris Flow Based on Excess-Height in Bend
Jiang Zhongxin
2007, 21(6): 288-291.
[Abstract](72) [PDF 323KB](9)
Abstract:
The current velocity is an important parameter of debris flow, and it is more difficulty to be measured and calculated. Based on analysis to every known calculating formulas of excess-height in bend, the calculating models of excess-height in bend m every debris flows are explored. Further, the formulas calculating current velocity of mudflow, dilute and viscous debris flows based on excess-height in bend are improved, and are tested with real examples.
Improvement Analysis Method on the Stability of the Wedge Rock Mass
Yang Biao, Li Zhangdong
2007, 21(6): 292-295,303.
[Abstract](67) [PDF 249KB](15)
Abstract:
The stability analysis and evaluation of wedge rock mass is a difficult problem in engineering field, and there are defects in the traditional evaluation method. By the establishment of the related computer program, the various improvement to the traditional method is made, and the method of vector algebra is applied to calculate the safety factor of block model. The automatic implementation of the stability analysis and evaluation of weage rock mass are acchieved by the program. Finally, the feasibility and advantage of the improved method is verified by a real instance in engineering field, the method has considerable practical value.
Applying Refined Load-transfer Method to Analyze Bearing Characteristic of Single Pile
Zhao Haiyuan, Gao Qiang
2007, 21(6): 296-299.
[Abstract](49) [PDF 213KB](7)
Abstract:
Applying refined load-transfer method to analyze bearing characteristic and settlement behavior of single pile, and compared with test recruits, the calculational results are precise close to designed load. When there is no test result, load-transfer method can be applied to analyze bearing characteristic and settlement behavior of single pile, and it will be an effective assistant measurement for the analysis of bearing capacity.
Simulation-Optimization Investigate Into Resist Dynamical Pressure Shaft Wall
Feng Yongguang, Liu Xiliang, Ju Xiaodong
2007, 21(6): 300-303.
[Abstract](80) [PDF 431KB](8)
Abstract:
Based on the construction of a shaft wall in mining influence area, the different structure types of the shaft wall are numerical simulated by FLAC3D numerical simulation soft. The structure types, includes pure concrete, reinforced concrete, complex shaft wall with added gasket to outside shaft wall and complex shaft wall with added stow-wood to inside shaft wall, are compared with each other. And the influences of stow-woods in different positions and its stiffness are analyzed. The simulation indicates that added stow-wood to inside of shaft wall is better and gasket thickness positions(stiffness) have little effect to shaft wall loaded.
Application of Heterologous Material Pile Composite Ground in a Certain Engineering
Guo Xin, Liu Zunping, Zhu Jintai
2007, 21(6): 304-306.
[Abstract](62) [PDF 315KB](8)
Abstract:
In the implementation stage of a soil-cement pile composite foundation treatment, the length of pile can hardly meet the design requirement because of the saturated silty.soil. The heterogonous material pile that the lower part is made up with different material is employed in the design changing. The bearing capacity of the heterogonous material pile is proved to be consistent with the design requirement. These offer new approach to similar engineering.
Determination of Pile Tip Bearing Stratum by Deep Flat Static Loading Test
Zhang Haifeng, Yue Yuanyuan, Lou Zhiliang
2007, 21(6): 307-309.
[Abstract](105) [PDF 312KB](16)
Abstract:
Deep fiat static loading test is introduced as a new kind of in-situ test method. It is employed to a manual excavation pedestal pile engineering, and the bearing capacity characteristic values, are determined. Based on the result of the loading test, the determination of the pile tip bearing stratum is optimized, and the cost of the engineering is saved.
Research on Ecological conservation of River Bank Slope in Cold Regions
Yuan Anli, Han Lei
2007, 21(6): 310-312.
[Abstract](64) [PDF 180KB](6)
Abstract:
Based on the two engineering examples in Heilongjiang Province, several methods of the ecological bankslope proteetion for cold regions are presented which can not only improve the security of the river but also restore the entironment. It has gained perfect effects.
Rainfall Effect Analysis on Soil Slope Stability
Li Chenghai, Luo Qingfeng
2007, 21(6): 313-314.
[Abstract](70) [PDF 106KB](14)
Abstract:
Based on the analysis of the relationship between the rainfall and the soil characteristics, such as shear strength, unit weight, hydraulic pressure and chemical action, rainfall effect on soil slope stability is discussed. And a landslide that caused by the rainfall and the treatment is introduced.
13 000 kN Static-loading Test in the Ⅲ Sign Section of Cao River Flume Pile Foundation of South-to-North Water Transfer Project
Chang Fuyuan, Song Yucai
2007, 21(6): 315-318.
[Abstract](59) [PDF 389KB](11)
Abstract:
The flume at Cao River is an important building of the emergency water supply project for the Beijing-Shijiazhuang section on the Mid-Route of South-to-North Water Transfer Project. The Ⅲ sign section flume foundation uses pile foundation. In order to test the single pile vertical bearing capacity, 13000kN vertical static-loading experiment is done. The experimental result shows that the pile vertical compressive beating capacity satisfied the design requirements.
Chemical Mechanism Analysis on Lime Improvement for High Speed Railway Loess Filling
Wang Xianlong
2007, 21(6): 319-323.
[Abstract](71) [PDF 225KB](7)
Abstract:
Based on the.soil improvement testing results of loess filling in one Passenger Dedicated Line Project, the chemical mechanism for lime improved soil is investigated. It is pointed out that the improved loess is qualified as filling material for subgrade of the high speed railway project, and the major task of the rail improvement tests is to determine the economic rational mix ratio as well as the optimum water content.

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