›› 2010, Vol. 31 ›› Issue (6): 1989-1994.

• Numerical Analysis • Previous Articles     Next Articles

Numerical analysis of slab underpinning construction in development of underground space

JIA Qiang，ZHANG Xin   

  1. Shandong Jianzhu University, Shandong Provincial Key Laboratory of Appraisal and Retrofitting in Building structures, Jinan 250013, China
  • Received:2009-11-12 Online:2010-06-10 Published:2010-06-25

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Abstract:

The slab underpinning technology is an effective method for developing underground space of existing buildings. Firstly, after partial top slabs have been constructed, the soil under these slabs support the weight of structure while the soil at the rest places can be dug; then the columns or walls in the basement can be lengthened and the base slabs can be constructed. Secondly, these finished slabs can be taken as underpinning components to support the weight of structure; and the rest jobs such as digging soil under the slabs, constructing the top slabs and the base slabs all can be done. The settlement tendency of column-heels can be gotten by setting up the 3D finite element model using ANSYS program,which can analyze the five phases of underpinning construction. Before the phase of digging soil, the settlement values of column-heels in middle part are larger than those in around part; while, after the phase of digging soil, the settlement values of column-heels in middle part are smaller than those in around part because of the decreasing weight of dug soil. The settlement values have relations with the elastic modulus of soil and increasing load of the building. The additional moments caused by differential settlement can be gained by setting up the 2D finite element model.

Key words: slab underpinning technology, finite element method, settlement, additional internal forces, numerical analysis

CLC Number: 

  • TU 470
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