The Use of Bentonite Mud in the MTBM of the Rock Areas
When MTBM is used to construct a tunnel in cohesive soil area,the main force need to resist is adhesive force generated by soil or clay around the machine,which can be reduced by the lubrication.In this case,the most commonly used lubrication is bentonite mud,which is injected through ports in the jacking head and filled outside of the pipes.In rock area,the formation is hard enough to support the pipes,if both entrance and exit are sealed well enough to prevent the lubrication lose,and also make sure the mud be injected continuously and around the pipe all the time which makes the pipes “float,frictions between pipes and rocks will be nearly zero under this perfect status.So we can conclude that in rock area,the lubrication system is not only to reduce the resistance force coming from the soil,but also to lower the frictional force coming from rocks.In some sedimentary rock areas,clean water might be the best lubrication.This theory has been successfully used and proved in different crossings of MTBM site in Chinas second West-East Gas pipeline project.
MTBM Bentonite mud
Mengpeng Cheng Wenwei Zhang Peng Sun Lin Huang
Applied Technology&Standard Research Center Of China Petroleum Pipeline Engineering Corporation ,Chi China Petroleum Pipeline Engineering Corporation ,Chief Engineer, No.146, Heping Road, Langfang, Heb China Petroleum Pipeline Research Institute ,Project Manager, No.44 Jinguang Road, Langfang, Hebei 0 China Petroleum Pipeline Research Institute, Project Manager, No.44 Jinguang Road, Langfang, Hebei 0
国际会议
北京
英文
1665-1672
2012-10-14（万方平台首次上网日期，不代表论文的发表时间）