砂充填 meaning in Chinese

sandfilling
sandstowing

Experimental study on the proportion of tailings backfilling pulp
尾砂充填料浆的配合比试验研究
Study on the comprehensive technology of presupporting of roof and walls in tailings back - fill mining
尾砂充填采矿法采场预控顶护帮综合技术研究
An experimental research on the optimization of fines and lime contents of tailings - binder paste backfills for mining
全尾砂充填材料组份含量优化的试验研究