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20 February 1998, Volume 17 Issue 1 Previous Issue    Next Issue

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Optimal Design Researches on Drain Hole in Drain Tunnels of Permanent Shiplocks Area of the Three Gorges Project Chen Hong kai, Tang Hongmei 1998, 17(1): 1-6.  Abstract ( )   PDF (93KB) ( )   The Three Gorges Project is one of the greatest hydroelectric projects in the world .Seepage and drainage in rock mass, which have important influences on stability and deformation of the permanent shiplock slopes, are the greatest research content in the course of some key techtoniques in construction of the shiplocks.In this paper , we expound drain mechanism of drain hole in drain tunnels, then point out two group advantageous design orientation for drain hole , and make a practical research on the basic model for drain hole to be designed in the slopes. References | Related Articles | Metrics

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Study on the Carrying Capacity of Mixed Traffic Flow Luo Xia， Du Jinyou， Hou Yamin， Cheng Yinwen 1998, 17(1): 7-10.  Abstract ( )   PDF (49KB) ( )   Through the study on different vehicles' following alignment , this paper gains the mathematical model on carrying capacity under different vehicles' proportion.Based on the study of flow-speed-density relationships, we gain the ideal carrying capacity and the influence to speed caused by the mixing-rate of mixed traffic flow in addition.There arent any linear relationships among different vehicles as to the occupancy of lanespace. References | Related Articles | Metrics

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The Model Test Research on Guanyintan Reach in the Variable Backwater Zone of the Three Gorges Project in the Variable Backwater Zone of the Three Gorges Project Cheng Chang hua, Zheng Yinggong 1998, 17(1): 11-17.  Abstract ( )   PDF (54KB) ( )   The sutdy deals with the river regulation and shipping in the rear reach of the Three Gorges Project.The report exhaustively expounds the natural stream regime, the original design schemes and the modified one. Here furnishes comprehensively the gradient of water surface, velocity, flow patterns, boat-model test, regulation measures, project quantity and so on. Based on the comparison with different schemes and analysis of test data, an optimum regulation scheme is recommended, which gives a reliable basis for regulating the reach, so that the tenthousand- ton fleet can sail up to Chongqing. It is also useful to further investigations and thorough researches on the typical torrent rapids. References | Related Articles | Metrics

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Study on Backwater Surface Profile in the Three Gorges Reservoir Huang Guocai, Huang Bishan, Chen Dezhang 1998, 17(1): 18-22.  Abstract ( )   PDF (54KB) ( )   By means of water level, discharge data in the field investigation and calculating method on unsteady flow, this paper studies backwater surface profile from Changshou to Haiguan in the Three Gorges reservoir and obtains some important results worthwhile reference. References | Related Articles | Metrics

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Methods of Estimating Roughness after Regulation of River Xu Guang xiang 1998, 17(1): 23-27.  Abstract ( )   PDF (56KB) ( )   At present , the channel roughness we use after regulation almost all makes use of that before the regulating .Because flow condition and bed configuration and channel roughness vary with regulation , if roughness before regulation is still used , precision of hydraulic calculation would be affected. This paper has discussed estimating method of roughness and inferred estimating formulas of roughness after regulation of river. It is of aid to improve precision of hydraulic calculation . References | Related Articles | Metrics

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Critical Submerged Method Applied to the Computation of Flow over Broad-crested Weirs Yu Huaqian 1998, 17(1): 28-30.  Abstract ( )   PDF (45KB) ( )   Appling the critical submerged theory presented to the research of flow over broad-crested weirs, the discharge formula which the results of computation coincide with the present computing method is obtained in this paper . References | Related Articles | Metrics

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Several Problems in Consideration to Selecting Bridge Address on Navigable River Chen Mingdong, Luo Jialin, Yang Bin 1998, 17(1): 31-38.  Abstract ( )   PDF (188KB) ( )   In this paper, through the selecting of the address of Luzhou No.2 Bridge on the Yang tz River, several problems in consideration to selecting bridge address on navigable river are discussed . References | Related Articles | Metrics

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Design and Test of Filling Culvert Intake Port Type of Lock Luo Jialin, Chen Mingdong 1998, 17(1): 39-46.  Abstract ( )   PDF (76KB) ( )   Based on the intake type of lock filling and emptying system, trend of plan layout is summarized.The relation of intake port area and coefficient of resistance are obtained/studied. A principle of design is presented. The results in this paper can be used as reference on lock design of filling and emptying system. References | Related Articles | Metrics

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Study on the Failure and Deformation Capacity in Weld of the Beam-to-Column Joint Liu Xiaoyu 1998, 17(1): 47-51.  Abstract ( )   PDF (63KB) ( )   In this paper, several types of beam-to-column subassemblages are tested in repeated loading. The type of failure and deformation capacity in w eld at the end of beam are evaluated . References | Related Articles | Metrics

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A Review on the Research of Cracking Resistance Ef fect of Semi-rigid Pavement Jiao Xinghai, Zhou Xing chun 1998, 17(1): 52-57.  Abstract ( )   PDF (54KB) ( )   Reflective cracking is a distress which influences the performance of semi-rigid pavement. In this paper, based on studies and investigations of reflective cracking of semi-rigid pavement, the idea of using high quality granular base as sandwich layer to ervent semi-rigid pavement from reflective cracking is developed . References | Related Articles | Metrics

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The Bending and Cleavage Properties of Semi-rigid Basecourse Material Wei Changjun 1998, 17(1): 58-61.  Abstract ( )   PDF (56KB) ( )   The paper compares the bending and the cleavage properties of semi-rigid basecourse material. Semi-rigid material is in a state of two-direction stress as it was split ted, and the practical basecourse material is in three under the traffic loads. The conclusion is given that the cleavage fitague testing method is more reasonale than the bending fitague testing method for determining the fitague properties of semi-rigid material. References | Related Articles | Metrics

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Study of Deflection Equivalent Conversion Method for Overload Axles Li Qiaoru, Li Guoqiang,　Wei Lianyu 1998, 17(1): 62-68.  Abstract ( )   PDF (61KB) ( )   Through the analysis of the 4th power law and the present axleload conversion law popular in our country, this paper indicates their unsuitability for overload axles. By using equivalent theoretical and actual deflection restrains, a conversion method of computing axleload equivalent factors is derived, and its applicability is analysed. This method can be tentatively used for overload equivalent conversion. References | Related Articles | Metrics

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Application of Central-point Method in the Reliability Analysis of Reinforced Concrete Members Yu Pei 1998, 17(1): 69-73.  Abstract ( )   PDF (46KB) ( )   Referring to some statistical parameters, the current method examined and analyzed by means of approximate theory of probability. References | Related Articles | Metrics

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The Design Method of Roller Compacted Concrete Pavement Yu Jianrong, Chen Rongsheng, Niu Kaimin 1998, 17(1): 74-81.  Abstract ( )   PDF (90KB) ( )   The design method of roller compacted concrete pavement is put forward in this paper, according to an itern in the "Eighth Five-year Plan", i.e., the study of the design method of roller compacted concrete pavement construction. The new design method can be used as references by construction units when laying down standards. References | Related Articles | Metrics

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Experimental Study on the Over-Early Strength Cement Concrete Chen Zhongda Zhang Dengliang Chen Shuanfa 1998, 17(1): 82-86.  Abstract ( )   PDF (45KB) ( )   Through a large number of mortar tests in laboratory, the ZC-type admixture, which is a compound of early-strength and water reducing agent, is selected as the admixture of over-early strength cement concrete, and accordingly, the rational admix dosage is determined. The test results of cement concrete show that the bending strength in 12 hours is 3.84 MPa for fast mending concrete pavement . References | Related Articles | Metrics

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Two Ways for Enhancing Concrete Strength Tian Wenyu 1998, 17(1): 87-91.  Abstract ( )   PDF (51KB) ( )   Artical analyses factors which affect concrete strength and introduce ways in producing highstrength concrete. It also compares the action of sillica fume in concrete with that of water-reducer, and concludes that potencially sillica fume has stronger influence in producing high-strength concrete than water-reducer does. References | Related Articles | Metrics

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Treatment of Karst Foundation of the Lower Head of Huaxi Lock in the Lianjiang River Li haohong 1998, 17(1): 92-95.  Abstract ( )   PDF (49KB) ( )   Huaxi Lock in the Lianjiang River has been in operation for more than twenty years. The set tlements occurred in the lower head of the lock, though in different degrees, are maialy due to the failure of solution caverns under the foundation, and foundation erosion. The pressure grounting technique for the foundation of lower head, and concrete floor placing method for the chamber are used in order to increase foundation bearing capacity and impermeabicity. The methods proved to be effective. References | Related Articles | Metrics

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The Analysis of Soft Sail Treatment Effects by Using Sand Compaction Pile Jiang Jianming 1998, 17(1): 96-101.  Abstract ( )   PDF (63KB) ( )   In this paper,through static penetration and standard penetration,we got the data of using sand compaction pile for soft soil treatment and tested the sand pile & the soil among piles of soil treatment.By analysizing statistics,we establisheol the relationships between the two testing methods and worked out the limit tatum to sure the density of sand compaction pile.We have found a quick and practical test method to use static penetration to examine the construction quality of sand compaction pile and to speed up the construction of soft soil treatment and the density examing of sand pile by supervisors. References | Related Articles | Metrics

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Construction Techniques on the Main Tower at North Channel of No 2 Oujiang Bridge in Wenzhou Zuo Mingfu 1998, 17(1): 102-108.  Abstract ( )   PDF (76KB) ( )   This paper expounds the construction methods of an octagonal double wall steel cofferdam,which is the biggest in our country at present.It contains the fabrication and launching the first segment of cofferdam and which the positioning and sinking without direction guiding ship positioning system,the construction of the greatest diameter bored piles under complex geological conditions and the bigger area sealing under water of the cofferdam bottom. References | Related Articles | Metrics

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Study on Fuzzy Active Control on Nonlinear Vibration of a Centrifuge Rotor System Li Yinong, Zheng Lin, Yuan Yi, Wen Bangchun 1998, 17(1): 109-113.  Abstract ( )   PDF (56KB) ( )   The fuzzy changing stiffness method is used to control the unstable self-excited vibration of a centrifuge in auordance with the particularity of the vibration of a centrifuge rotor system. The result of simulation show that fuzzy changing stiffness control method can restrain the unstable self-exciled vibration in centrifuge rotor system very well. References | Related Articles | Metrics

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Study on the GPS Kinematic Point Positioning by Pseudrange servations Cao Zhixiang 1998, 17(1): 114-118.  Abstract ( )   PDF (61KB) ( )   The real-time GPS kinematic point positioning by pseudrange observations is discussed in this paper. The mathematical models processing method and software development are investigated. The vehicle-borne measurement data are processed with the method of the kinematic single point positioning, C/A code DGPS and P code DGPS with the software are developed by the auther, and the results are analyzed with statistical method. References | Related Articles | Metrics

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A Supervision Method of Construction Quality Control in Subgrade Fill of High Type Highway Zou Yi 1998, 17(1): 119-122.  Abstract ( )   PDF (117KB) ( )   It proposes a supervision method of eonstruction quality control in the subgrade fill of high type highway according to the practices and the specific characteritics. References | Related Articles | Metrics