Construction method for reducing damage to cutter of tunnel boring machine in upper-soft and lower-hard stratum

• Main Authors: LI HUI, REN DONGJIE, SHEN SHUILONG, YUAN YAO
• Format: Patent
• Language: English
• Published: 20.01.2016
• Subjects: EARTH DRILLING; FIXED CONSTRUCTIONS; GALLERIES; LARGE UNDERGROUND CHAMBERS; MINING; SHAFTS; TUNNELS

The invention provides a construction method for reducing damage to a cutter of a tunnel boring machine in an upper-soft and lower-hard stratum. The method comprises the following steps: step 1, carrying out engineering geological investigation to confirm the stratum distribution along a tunnel and the unconfined compressive strength of soil mass or rock mass in all the stratums; step 2, according to a tunneling route of the tunnel boring machine and the stratum distribution, confirming the reasonable rotating speed of a cutting disc during tunneling in a single stratum as well as the maximum value of the area occupied by the harder stratum within a tunnel face range to the area of the tunnel face when the tunnel boring machine passes through the upper-soft and lower-hard stratum; step 3, confirming the designed rotating speed of the cutting disc when the tunnel boring machine passes through the upper-soft and lower-hard stratum; step 4, calculating the average torque of the cutting disc according to the stratum distribution, and judging whether the tunnel boring machine enters the compound stratum or not, so as to adjust the rotating speed of the cutting disc. The method provided by the invention is simple in technology and easy to handle, and can be utilized for effectively reducing damage to the cutter in the upper-soft and lower-hard stratum, remarkably prolonging the service life of the cutter, and greatly improving the construction efficiency and the economic benefit.