Experimental research of Beijing - Shanghai high-speed railway in deep soft soil section bridge foundation
|School||Central South University|
|Keywords||High-speed rail Deep soft soil Grew up in pile foundation Compression modulus Creep test Compression layer Data management software|
Very stringent requirements of high-speed railway line ride, therefore, carry out the pile performance test research is very important, especially in deep soft land section of the bridge foundation, in particular. A key project of the Ministry of Railways of the Beijing-Shanghai high-speed railway deep soft land the segment bridge foundation settlement monitoring and test relying on the typical soft land segment bridge foundation performance test research and analysis, and obtained the following results. (1) the preparation of the Beijing-Shanghai high-speed railway bridge foundation settlement and deformation observation program proposed bridge foundation deformation subsidence monitoring the concrete implementation of the technology, including basic requirements, technical standards, measuring points, bps retest level roadmap pier specific measures on the basis of observing the system as a whole layout method and guaranteeing access to a variety of reliable monitoring data. Field test research shows that the the deformation observation method is effective, observation components and equipment is reliable, good promotional value. (2) The proposed the precise leveling joint static level monitoring of bridge foundation settlement method has been successfully applied in the Beijing-Shanghai high-speed railway typical test work sites. Long-term settlement of the data to obtain a full and reliable high-speed railway bridge foundation, pile compression deformation data. (3) Long pile foundation characteristics typical soft soil area of ??the Beijing-Shanghai high-speed railway, the proposed settlement taking into account the joint monitoring of the strain gauge bridge foundation pile bottom compression layer deformation, grew up Piles the compression layer deposition of installation laying process, provide a reliable technical method for testing compression pile bottom layer deformation. (4) the indoor pressure consolidation test pile subsoil pressure segment compression modulus Es value, through statistical analysis of the corresponding compression modulus of Es0.1-pile bottom compression layer in the range of 100-200kPa stress 0.2 and gravitational stress to the weight stress plus the additional stress range corresponding to the empirical formula between the compression modulus Es. (5) obtained by the indoor creep test pile subsoil in the soft soil section of the Beijing-Shanghai high-speed railway loads at all levels of the stress - strain - time curve of the bottom of the pile soil creep deformation characteristics, creep model identify and parameter inversion. The comparative analysis shows that the the Schiffman viscoelastic model can better describe the deformation characteristics of the soil pile bottom. (6) preparation of the the pile foundation monitoring data management software, user-friendly, data interact convenient, there are good practical value.