碎石层 meaning in English

crushed stone
macadam
tie bed

To counter the main reasons of piles ' displacement and inclination , i . e . , 1 ) greater lodging after removal of pile cap ; 2 ) inclination of pile frame ; 3 ) driving into ballast course ; 4 ) obvious rolling of excavated mud surface , a set of effective measures dealing with deviation of marine driving are offered
针对其中影响桩跑位和桩倾斜的主要原因，即： 1 )起帽后桩倒伏大； 2 )桩架不垂直； 3 )碎石层上沉桩； 4 )挖泥泥面起伏大，总结出一套控制水上沉桩偏位行之有效的方法。