Insitu test of internal force for structure hippocrepiform shield tunnel

Taking Baicheng tunnel as engineering background, the internal force of segment structure for hippocrepiform shield tunnel was monitored and measured. The distribution characteristics and variation with time of the internal force of hippocrepiform segment structure were summarized. The values of internal force with different depth sections were compared, and those of measured were compared with those of designed. Conclusions are as follows: (1) makes clear the distribution characteristics of internal force for the hippocrepiform shield segment structure. (2) During the course of segment assembling, synchronised grouting and segment leaving from tail, construction load influence significantly on the internal force of segment structure, therefore, should pay attention to control of construction load and reduce the adverse effects on the segment structure. (3) The internal force value of deep buried section is less than the value of middle buried section, which is consistent with the design, and validate the rationality of the design. (4) The measured internal force values of each buried depth section are significantly smaller than the corresponding calculation values in design, thus proving the safety of the segment structure in design. © 2017, Editorial Office of China Civil Engineering Journal. All right reserved.