Abstract:

Unconfined compressive strength, bending strength and failure deflection of frozen soil is studied to ensure the safe execution of freezing and tunneling, with the construction of the connection gallery of the rivercrossing shieldbored tunnel between Binjiang Road Station and Fuchun Road Station on Hangzhou Metro Line 1 as an example. 〖JP2〗Conclusions drawn are as follows: 1) The unconfined compressive strength of soil layers increase much at -10℃, reaching 2.9～5.9MPa〖JP〗; 2) The failure strain and the failure deflection meet the construction requirements; 3) Compared to other soils, frozen silty sand has the highest compressive strength, and muddy and silty clay has higher failure strain than other soils; 4) The bending strength of pebble and silty sand increases obviously, reaching more than 8MPa, and the bending strength of frozen muddy and silty clay and silty clay can reach 4.0～5.5MPa; 5) The failure deflection of muddy and silty clay, silty clay and silty sand are almost the same, and the failure deflection of frozen pebble is the lowest.

Key words: Hangzhou Metro, frozen soil, strength, geotechnical test, mechanical behavior