Study on the Jacking Force of the Underpinning by Pipe-Jacking for the Historical Masonry Constructions
The structural damages, which result from the inadequate bearing capacity or the asymmetric support of foundation, are one of the crucial works in the conservation of historical masonry constructions. A new underpinning technique, applying the principle of pipe-jacking, is presented in this paper, which can build a new foundation system having sufficient rigidity under the bearing wall of the upper building. The technique has been successfully used in the conservation practices of masonry constructions, but the basic problems involved in the technique has not yet studied. Based on the field test, the principle of the underpinning by manual pipe-jacking , the mutual effect mechanism between box girders and soil, the calculation of jacking force and its influence factors are investigated in detail, and the empirical formula of calculating jacking force is also presented.
Qing Yang, Li Hua Zhu, Jing Jing He, Zeng Feng Yan and Rui Ren
W. X. Zhang and Y. T. Liu, "Study on the Jacking Force of the Underpinning by Pipe-Jacking for the Historical Masonry Constructions", Advanced Materials Research, Vols. 368-373, pp. 2473-2477, 2012