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In order to study the correlation between TBM operating parameters and different lithologic strata， taking a Xinjiang water diversion project as the background, 300 m of tunneling parameter data was selected for typical lithologic strata. The correlation between 3 tunneling parameters and 6 lithologic strata was analyzed by using mathematical statistics. By analyzing the correlation among propulsion speed, total thrust and cutter speed under the six types of lithologic strata, the tunneling suggestions were put forward. The results show that the average value of propulsion speed and total thrust varies greatly among different lithologic strata. The cutter speed fluctuates little, and the average difference is small. In siliceous, ande site and tuff strata, the total thrust, cutter speed and propulsion speed are not correlated. In mylonite and sandstone strata, the total thrust, cutter speed and propulsion speed are positively correlated. In cataclastic rock strata, the total thrust is negatively correlated with the propulsion speed. [ABSTRACT FROM AUTHOR]

Study on the quality of dam foundation rock mass will help to reasonably select the foundation surface, and provide a scientific basis for engineering design, construction and safe operation. Taking the dam foundation rock mass of Sanhekou reservoir for Hanjiang-to-Weihe river water diversion project as the research object, the rock mass exposed by the dam foundation excavation was re-explored; meanwhile, the weathering characteristics, structural characteristics, relationship between longitudinal wave velocity and deformation modulus of dam foundation rock mass were elaborated comprehensively by using the test of the downhole television, longitudinal wave velocity, deformation modulus with prospecting holes; and the utilization of fault fracture zone and cataclastic rock of the dam foundation was analyzed emphatically, and a detailed engineering geological classification of dam foundation rock mass was discussed. Finally, the practical foundation surface is selected to raise elevation of the dam foundation plane from 501.0 m to 504.5 m, which optimizes the excavation depth of dam foundation, reduces the difficulty of dam foundation treatment and concrete pouring, and saves construction period and project investment. [ABSTRACT FROM AUTHOR]