›› 2012, Vol. 33 ›› Issue (9): 2671-2676.

• Geotechnical Engineering • Previous Articles     Next Articles

Theoretical studies of pile tip post grouting residual stresses based on spherical cavity consolidation model

ZHANG Zhong-miao1, 2, HE Jing-yu1, 2, 3, FANG Kai1, 2   

  1. 1. Institute of Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China; 2. Key Laboratory of Soft Soils and Geoenvironmental Engineering, Ministry of Education, Zhejiang University, Hangzhou 310058, China; 3. Urban and Rural Construction Commission of Nanning City, Guangxi Zhuang Autonomous Region, Nanning 530029, China
  • Received:2011-05-12 Online:2012-09-11 Published:2012-09-12

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Abstract: Residual stresses at the pile pit during pressure grouting are studied theoretically based on the solutions of expansion of spherical cavity and one-dimensional consolidation. By analyzing of the dissipation process of residual stresses, the analytical solutions of residual stresses dissipation with time and diffusion radius are obtained for assumed initial exponential pore pressure distribution. Also, a simplified solution discarding effect of grout spread radius is compared with the present method for different relative parameters. Parametric studies show that rheological index, consistency index, compression modulus and consolidation time are the key issues affecting pile residual stresses. In addition, the validity of the proposed model is tested by comparing the results from field measurements. This research is great important for the theoretical studies and practical applications of the residual stresses.

Key words: pile tip post grouting, consolidation of spherical cavity, residual stress, diffusion radius, pressure dissipation

CLC Number: 

  • TU 411.3
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