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.
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
2015, Vol. 52 