Abstract:
To research the mechanism of the segment joint of an immersed tunnel under uneven settlement and load, the similarity ratio of a relevant model test was determined regarding the dimension of the test platform, and the similarity criteria was deduced based on the similarity theorem. Regarding the similar material selection, a low-grade cement with a high water-cement ratio and sand ratio, an aggregate with a low elastic modulus, bentonite, polypropylene fiber, and fly ash were adopted to prepare a strong mixture with a low elastic modulus, whose mix ratio was determined via a test. Furthermore, a mechanical test was carried out with a universal press machine, strain gauge, and extensometer for the specimen's strength and elastic modulus. According to the mix ratio test, a similar concrete material with an elastic modulus less than 10 GPa and strength greater than 8 MPa can be produced by adjusting the content of bentonite, whose mechanical behavior is as stable as that of the normal concrete.
HU Zhi-南,
XIE Yong-Li,
LAI Hong-Peng
.Research on Similar Materials for a Large Immersed Tunnel Model Test[J] MODERN TUNNELLING TECHNOLOGY, 2015,V52(1): 114-118