某隧道地基岩体的应变率效应研究

依托广州如意坊放射线系统工程，利用万能试验机（DDL300）和分离式霍普金森压杆（SHPB）对水下拟建隧道岩体进行钻孔取样，进行静态力学试验和冲击试验；研究其静动态力学性能和应变率效应。结果表明:岩体试样脆性大，静态抗压强度为29.23 MPa，应变率敏感性较大，应变率在24～73 s?1范围内；动态抗压强度为45.30～74.14 MPa，动态增长因子（DIF）为1.55～2.53，抗压强度、抗拉强度和动态增长因子随应变率的上升而增强和上升，表现出正应变率效应。

Study on Strain Rate Effect of Rock Mass in a Tunnel Foundation

Relying on the Guangzhou Ruyifang radiation system engineering, the universal testing machine (DDL300) and the split Hopkinson pressure bar (SHPB) have been used to drill and sample the rock mass at the proposed underwater tunnel and have been used for static mechanical test and impact test so that the static and dynamic mechanical properties and strain rate effects can be studied. The results show that the rock samples have high brittleness, the static compressive strength is 29.23 MPa, and the strain rate sensitivity is large within a range between 24 ~ 73 s?1. And the dynamic compressive strength is 45.30 ~ 74.14 MPa, the dynamic growth factor (DIF) is 1.55 ~ 2.53. The compressive strength, tensile strength and dynamic growth factors increase with the increase of strain rate, showing a positive strain rate effect.