石垫层 meaning in English

bedding stones

In connection with impact compaction technology of soil & stone cushion of third airstrip of pudong airport , it selects such experiment research as constructive technology & quality control , puts forward such constructive control parameters as pressing subsidence ratio ( single subsidence ratio ) , pressing times , pseudo thickness and so on
摘要基于浦东机场三期跑道山皮石垫层采用冲击压实技术进行压实的问题，选取试验段进行了施工工艺及质量控制等试验研究，提出了冲压沉降率（分计沉降量）、冲压遍数、虚铺厚度等施工控制参数。