科研之友
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摘要
In this study, a new method for selecting hard rock TBM tunnelling parameters is established using optimum energy. Several concepts on energy, such as specific energies in tunnelling, Est, rock crushing, E-s(r), and friction, El, are proposed and their relationships in the TBM tunnelling process are analyzed. Moreover, a new formula for calculating the tunnelling specific energy, Esr, considering three factors geological parameters, TBM technical specifications, and rock-machine interaction relationship is presented. In order to study the optimum tunnelling parameters, a series of preliminary full-scale disc cutting tests are conducted using the TJ-TS500 linear cutting machine (LCM). The LCM tests show that for a specific type of rock, there is an optimum spacing to penetration ratio (s/p) based on the optimum rock crushing specific energy, E-s(r). To obtain the optimum value of s/p for different rocks, the laws of the optimum s/p and rock uniaxial compressive strength are obtained by data regression. Based on these rules, TBM tunnelling under specific geological conditions, not only can the optimum penetration be obtained, but also the optimum Est and the optimum tunnelling parameters can be calculated. This method provides an evaluation standard for selecting TBM tunnelling parameters, and links the LCM test with the actual TBM tunnelling process using the energy method. Furthermore, to illustrate the applicability of this method, a case study of the Yinhanjiwei headrace project is introduced and analyzed in detail. By comparing the actual with optimum tunnelling parameters, the study proves that this new method is rational and that it can be used to select the optimum tunnelling parameters in hard rock TBMs.
- 出版日期2018-8
- 单位同济大学
