heading face
1.After comparing three repair scenarios, the following methods were chosen: injecting modified mud to heading face through mud supply tubes of the shield construction machine to block water seepage on the heading face; then maintenance worker entering the cabin under pressure to replace damaged seal and press cutterhead.
3.According to the serious heat disasters occurred during the mine construction period in Barapukuria Mine in Bangladesh,the paper summarized and analyzed the heat disaster features of the mine. The paper studied the principle of the compressed air refrigeration technology and the application of the refrigeration technology to the roadway heading face in the mine with the economic comparisons. The paper listed the actual applied results.
