高低承台桩基地震行为差异研究pdf7833Kb.PDF

34 6 Vol.34 No.6 2015 6 Chinese Journal of Rock Mechanics and Engineering June 2015 12 2 1 1 1 1 (1. 361005 2. 610059) ABAQUS () ABAQUS TU 473 A 2015 DIFFERENCE OF SEISMIC BEHAVIOR OF HIGH AND LOW CAPS OF PILE FOUNDATIONS 12 2 1 1 1 1 MA Kang XU Qiang LI Shulin CHEN Dongxia FANG Jun DOU Hanjie (1. Institute of Geotechnical Engineering and Hazard Monitoring Xiamen University Xiamen Fujian 361005 China 2. State Key Laboratory of Geohazard Prevention and Geoenvironment ProtectionChengdu University of Technology ChengduSichuan 610059China) Abstract The pile foundation could be classified into the high or low types according to the position of cap relative to the surface of grounds. In many engineering practice the settlement of unconsolidated clay or backfilled soil after construction the soil rheology or the seismic field subsidence may lead to the separation of the cap from the clay surface i.e. the cap was embedded originally into clay to a new state of high cap pile foundation. For the static conditionthis kind of separation may result in the negative skin friction force along the piles and reduce the vertical bearing capacity of piles. However under the seismic shaking condition the centrifuge shaking table experiments and simulation with ABAQUS on both the cases indicated that piles underwent a higher maximum bending moment and a much larger active depth under high cap case than those at l