Study On The Stability Of Combination Support System Of Reinforced Concrete Piles And Bored Piles In Soft Clay

The study on stability of soft soil foundation ditch and support methods has been a major research topic in the field of construction engineering. Soft soil foundation expresses the characteristic of low intensity, high compression and large water and the accidents occur frequently because of unreasonable design and support.Currently, the common way of protecting foundation such as the steel sheet pile, soil cement mixing pile and soil nail wall, diaphragm wall, bored, and SMW engineering methods is still widely used in soft soil foundation excavation. Along with the rapid large-scale infrastructure, near the railway, subway, downtown business district and other deep excavation in soft soil engineering, more and more single common excavation methods can not fully ensure the economic rationality in complex areas'foundation excavation.In this paper, the fourteen Railway Project Department Bureau Group Co., Ltd. Wenzhou construction of Bridge Road, Wenzhou City, Ronny works beneath the Tender Section III Jinhua-Wenzhou Railway overpass project engineering background and the "Combination Support System of Reinforced Concrete Piles and Bored Piles in Soft Clay "was creative proposed. The classical mechanics, interior numerical calculation, on-site industrial test and other methods are comprehensive used. This paper has explored the scope of support system, supporting the reliability, stability support system proposed by the Joint Monitoring Automation Management System, to form a complete set of universality and applicability of the soft soil foundation excavation of new methods. The main research results are as follows:(1) From the economic point and the supporting applicability, the existing methods of soft soil foundation excavation are carried out a comparative study. And the single mode of a protection application and limitations are analyzed. Combination with the project background, the "Combination Support System of Reinforced Concrete Piles and Bored Piles in Soft Clay "was proposed, which applies to 7 to 12 meters deep and cannot be supported by the soft soil foundation of support, and has achieved satisfied success in the most engineering practice.(2) According to the construction feature of the Jinhua-Wenzhou overpass railway, a comprehensive analysis and summary of "Combination Support System of Reinforced Concrete piles and Bored piles "design construction technology, technical requirements and major construction technical measures are bring up.(3) Make calculate and analysis to stability of "Combination Support System of Reinforced Concrete piles and Bored piles "by the methods of classical mechanics and numerical simulation and build a model using ANSYS software to simulate the deformation characteristics and laws in different conditions, which verifies the stability of combination support system in practical engineering. It also provides the basis for selection of indicators in the actual engineering support program, which helps to cut project cost.(4) On-site industrial experiment makes systematic monitoring to the effect of supporting. The results show that:Deformation and mechanical characteristics match with simulation results, verifying the stability of soft soil foundation in new support structure. At the point of practical monitoring, the method can ensure the soft soil foundation stability in the 7 to 12 meters deep without internal supporting.(5) Through the rational layout of monitoring equipments, the collection, reception and processing of data, the monitoring of support to soft soil foundation can be realized, which offers a comprehensive monitoring and management system.Research results over the respective link from the engineering practice, theoretical part, monitoring data analysis part of the "Combination Support System of Reinforced Concrete Piles and Bored Piles in Soft Clay "in the soft soil foundation excavation carried out in the application of analysis and research The results show that the method is a cost-effective cantilever method of soft soil foundation excavation, research results could be "Combination Support System of Reinforced Concrete Piles and Bored Piles in Soft Clay" promote the application to provide important theoretical and practical basis.