Strength of materials is required for building damshell for the sake of stability.
土石坝的坝壳材料主要为了保持坝体的稳定性，一般要求有较高的强度。
2
Meanwhile, with theoretical analysis and project analogy, the authors evaluate the characteristics of projects taking grit and pebble as damshell enrockment.
并通过理论分析和工程类比，对砂卵石作坝壳堆石料时的工程特性作出了评价。
3
If efforts to dam the Shell oil spill prove unsuccessful the final amount of oil leaked into the North Sea could be four times greater than it is at present, the company admitted on Wednesday.