A Simplified Calculation Method for the Wedge Model
(1 China University of Mining & Technology, College of Resources & Safety Engineering, Beijing 100083; 2 College of Safety Engineering, North China Institute of Science and Technology, Beijing 101601; 3 Beijing Zhinengxiangying Energy Conservation and Environmental Protection Technology Co. Ltd., Beijing 100160)
Abstract：
There are so many parameters in theorectical calculation formulas for the limit support force of a shield
excavation face, and the calculations are very complex. Based on the popular wedge calculation model, a simplified calculation for the limit support force was studied. The results show that the relationship between the logarithm lnσT of the calculated value and the internal friction angle φ of sandy soil is approximately linear when the internal friction angle is in the range of 20°~70°; and without considering the influence of additional stress on ground, the relation curve of lnσT and φ is approximately parallel under the different factors of sandy soil gravity, the diameter of the shield excavation face and the buried depth. A simplified calculation method for the limit support force of a shield excavation face was obtained by way of linear fitting and introducing the influence coefficients of the sandy soil gravity a, the diameter of the shield tunnel excavation face b and the buried depth c, which simplifies the solving process
of the limit support force of a shield excavation face.
2017, Vol. 54 