2002 Vol. 16, No. 5

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Optimization of BP Arithmetic and Its Application in Geotechnical Engineering
2002, 16(5): 249-251,264.
[Abstract](32) [PDF 326KB](5)
Abstract:
The investigation and analysis of the non-linear coefficient that influence the convergence deeply is attempted, and the example in geotechnical engineering of this investigation production is also presented. The production has promoted the practicability of BP network. The practice has proved that the convergence speed and precision of the network will be improved observably if the BP arithmetic is mended by the rule and method given in this paper.
the Application of Rorgh Sets in Underground Grottos Stabilization
2002, 16(5): 252-255.
[Abstract](31) [PDF 286KB](3)
Abstract:
Introducing the viewpoint of Classfication and Approach of Rough Sets,putting forward the conception of non-correspond ratio and the calculation expression,analyzing the sensitivity of the affecting factors in underground grottos through using the non-correspond ratio of rough sets,and finding the main factors, which represent and simplify knowledge as a tool in Decison Support System(DSS).
Ground Settlement Monitoring & Control in Metro Construction by Underground Cutting with Shallow Overburden
2002, 16(5): 256-259,279.
[Abstract](28) [PDF 402KB](5)
Abstract:
Introducing the actual conditions of the ground settlement monitoring in the running tunnels of Gongyuanqian Station~Haizhu Square Station of Guangzhou Metro Line 2, which is constructed by underground cutting method with shallow overburden, analyzing the primary causes of ground settlement, summarizing the accessorial technical measures, e.g. timely strengthening the initial support and variable grouting during tunneling to control the ground settlement. It is useful for theoretical research and application preference.
Development Trend and Progress in the Application of Composite Ground
2002, 16(5): 260-264.
[Abstract](33) [PDF 202KB](4)
Abstract:
The survey of composite ground technique is introduced briefly,then some conceptions are expounded,for example,composite ground,ground treatment,composite pile foundation,scattering pile,the influence of soil structure on composite ground settlement calculation is considered,brings forward a few opinions about development trend of composite ground.
the Calculation for Stress and Settlement of the rigid Pile Composite Foundation
2002, 16(5): 265-268.
[Abstract](42) [PDF 178KB](7)
Abstract:
With analysis of interaction of piles,soil and cushion,settlement characteristics of the rigid pile composite foundation is discussed.When penetrations are taken into account,the vertical additional stress is calculated by the results of Geddes and Mindlin in semi-infinite elastic space.Therefore,a new method to calculate settlement of the rigid pile composite foundation is obtained.
the Comparison of Composite Foundation Piles and Rigid-pile Composite Foundation
2002, 16(5): 269-272.
[Abstract](37) [PDF 293KB](4)
Abstract:
The rigid pile composite foundation has been widely used in Tianjin area. But the composite foundation piles have little been used in Tianjin area. The difference of design between composite foundation piles and rigid pile composite foundation is studied through two engineering cases.
Analysis of Ground Water's Uplift Pressure on Underground Construction
2002, 16(5): 273-274,283.
[Abstract](42) [PDF 244KB](7)
Abstract:
In case of multi-aquifers being, the problem of ground water's uplift pressure on underground construction,because of relative waterproofer(cohesive soil stratum), is complicated.Based on the scentific analysis for this problem, putting forward three essential conclusions.
the Application of Attribute Load Method in Nonlinear Analysis of Pile-Soil Foundation under Lateral Load
2002, 16(5): 275-279.
[Abstract](29) [PDF 212KB](3)
Abstract:
The attribute load method, which can predict the response of horizontally resisted pile,is introduced. The nonlinear behavior of pile is characterized by this method described by dimensionless chart forms. It is indicated that the attribute load method is not only simpler than p-y curve analysis, but also well approximates the result (including lateral deflection and maximum bending moments of pile) measured in field load tests.
New Three Point Calculating Method to Determine the Coefficient of Consolidation
2002, 16(5): 280-283.
[Abstract](33) [PDF 173KB](6)
Abstract:
Aimed at the problems of complicated calculation and low precision of the solution obtained by the present routine method to solve the coefficient of consolidation,putting forward a new kind of analytical calculation method. It has rather good practicability and reliability.
the Theoretical Discussion on Consolidating Saturated Sand by penetrative Grouting
2002, 16(5): 284-289.
[Abstract](40) [PDF 242KB](7)
Abstract:
Taking a engineering of Guangzhou metro for example,in which using penetrative grouting with MC-S material to consolidate saturated sand,through the simulative experiment indoor and experiment in situ,discussing the penetrative theory of using MC-S material to consolidate saturated sand,putting forward some conclusions,such as the relationship among the spread radius of liquor,the pressure of underground water and the physical and mechanical indexes of sand,the relationship among the grouting pressure,the penetrative rate of even medium and grouting time,and the coupling relationship of the grouting pressure field and the ground stress field.
Discussion on the Design of Ground Treatment by Cement-Soil Deep Mixing
2002, 16(5): 290-292,301.
[Abstract](32) [PDF 313KB](4)
Abstract:
Through analyzing a series of in-situ loading tests on the cement-soil deep mixing ground,confirming that some factors influencing on the bearing capability and Young's modulus should be taken into consideration in design.
Numerical Simulation on the Progressive Processes of the Wall Rock's Distortion Failure Caused by the Excavating of Footing Groove
2002, 16(5): 293-296.
[Abstract](42) [PDF 201KB](3)
Abstract:
The evolution processes of the distortion failure of wall rock caused by the footing groove excavating at MACAU is analyzed by numerical simulation code,Wall Rock Fracture Process Analysis(F-RFPA2D),which is developed by ourselves.The numerical simulation explains the evolution process and pattern of wall rock mass fracture,gains a accordant result with the actually,F-RFPA is a new numerical method to study the problem of Wall Rock Fracture caused by the slope and footing groove excavating.
Research on the Simplified Method of Design for Dewatering by Annular Partially Penetrated Wells in Phreatic Aquifer
2002, 16(5): 297-301.
[Abstract](36) [PDF 212KB](4)
Abstract:
Based on analyzing the discharge of the partially penetrated wells in phreatic aquifer,introducing the conception of "the effective zone" of pumping,probing into the feasibility and comparative error by translating the calculation of the discharge of the partially penetrated wells into the calculation of the discharge of the equivalent completely penetrated wells.Several examples indicate that simplified method can control the comparative error of the discharge of one pit within 20percent,then prove that the simplified method to a certainly has practical value.
Discussion on A Building of 32 Layers Based on Natural Ground in Shenzhen
2002, 16(5): 302-306.
[Abstract](41) [PDF 393KB](6)
Abstract:
From the aspects of bearing capacity,averaged settlement and integral decline,analyzing a building of 32 layers based on residual soil of granite,proving the feasibility of natural ground.The result is good reference of the simular engineering.
Discussion on CVRCC: Chaotic Vibratory Roller Compacted Concrete
2002, 16(5): 307-308.
[Abstract](25) [PDF 196KB](2)
Abstract:
Technology for RCC(Roller Compacted Concrete)is important progress of concrete construction technology and Chaotic Vibratory Roller is modern technology of vibratory roller. Basing on the wide band vibration of chaotic vibratory roller produced in Shanghai and Xuzhou, the compaction mechanism of chaotic vibration is analyzed and new technology of CVRCC i.e. Chaotic Vibratory Roller Compacted Concrete is advocated.
A New Technique of Thermo-mechanical Rock Fragmentation
2002, 16(5): 309-311.
[Abstract](25) [PDF 273KB](2)
Abstract:
Introducing the technology of thermo-mechanical rock fragmentation, general domestic and oversea developing situation, analyzing the fragment mechanism and the reason for improving the drilling efficiency, further expatiating the prospect of the technology of thermo-mechanical rock fragmentation and the measures that should be taken to consummate this technology.

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