(1. Department of Civil Engineering，Zhejiang University City College，Hangzhou，Zhejiang 310015，China；
2. College of Civil Engineering and Architecture，Zhejiang University，Hangzhou，Zhejiang 310058，China)
Abstract：The jacking force changes dynamically due to the continuous decreasing height of overburden soil in vertical tunneling method. To study the variation law of jacking force in vertical jacking construction，combined with the spherical cavity expansion theory and shear failure principle，two calculation models of jacking force，spherical cavity expansion-sliding friction model and shear failure-sliding friction model，are proposed，and a new and complete system of theory of jacking force is established. Based on the actual monitoring data of drainage engineering in Beihai and the test data，the correctness and suitability of theoretical calculation formula is verified. The results show that the theoretical calculation method in this paper is in good agreement with the measured results and test data.
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2023, Vol. 42 
