The workers had to go far below the soft bottom of the river. They had to reach rock and remove some of it in order to make a good base for towers.
工人们必须深入软河床下面，必须接触到地底的岩石并挖开它们，以便为塔构筑坚实的基底。
On the base of the rock mechanical properties, the mechanical deformation process of the passive maintained soft rock tunnels was analyzed, the mechanical principle for the active support is raised.
根据岩石的力学性质，分析了软岩巷道被动维护变形的力学过程，提出主动支撑的力学原理。
The major engineering geological problems of US dam site of Laokou Complex include relatively soft base rock lithology, low shear strength and bearing capacity.
老口枢纽工程上坝址主要的工程地质问题为坝址基岩岩性较软，抗剪强度、承载力偏低。
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