Abstract：
The shield-driven tunnels of Lanzhou Metro pass through a large area of red sandstone stratum with rich
water, low cementation, good grading and the mud content of about 5%. Direct mucking after shield excavation
might not only waste resources, but also cause relevant environmental problems. So, in this paper, a feasibility study is carried out for replacing river sands of synchronous grouting materials with red sandstone from shield tunnelling.The results show that the synchronous grouting mortar prepared with red sandstone can meet all technical indexes,with saving cost by about 40%, achieving better fluidity and reducing plugging rate by about 70%. The mud content of grout can be controlled by adjusting the addition amount of bentonite. Moreover, the permeable stone can also be made of red sandstone and used for municipal roads and other projects. It might not only solve the tight supply of raw materials in engineering construction, but also alleviate environmental damage caused by sand and stone mining in mountains and rivers.
GUO Guibin1 JIN Shihe2 LIU Qi2 SUN Hongbin2
.Study on Preparation of Synchronous Grouting Material from Excavated Red
Sandstone in Shield Tunnelling[J] MODERN TUNNELLING TECHNOLOGY, 2021,V58(6): 251-256
2021, Vol. 58 