soil-stratigraphic unit

Researches on p-y curves of large diameter piles are processing from fourfactors: soil friction angle, soil cohesion, soil unit weight and pile diameter.

研究了土的摩擦角、粘聚力、重度和桩径对大直径单桩的p-y曲线性状的影响，并总结出适合大直径桩的p-y曲线线型。

In the relatively dependent and most integral unit of catchment area in hilly red soil landscape, we study the yearly dynamics of surface water resources including rainfall, evapotranspiration and water storage.

以红壤丘陵景观中相对独立且整体性强的集水区为基本单元，重点研究了集水区内降水、蒸散、水量蓄存等地表水资源的年变化。

It embodied that the content of soil organic matter increased, soil unit weight improved, and the number of soil microorganism increased.

具体表现在增加了土壤有机质含量，有利于土壤容重的改善，同时增加了土壤微生物种群和数量。

Taking into account the collapsed soil buried on the drilling unit became loosen after the hole collapsed and drill bit being buried, the self-rescue device applied the idea of squeezing the collapsed soil back to the hole wall.

考虑到塌孔埋钻事故发生后，埋在钻具上方的塌落土体结构较为松散，自救装置采用了将塌落土体挤回孔壁的方法。

Each soil ecological unit of the basin-valley soil ecosystems has its own particular local climates, relief conditions, soil typ-es and resource advantages, therefore, it has a different develop-ing direction from the others'.

盆谷地中山棕色针叶林土生态单元。盆谷地土壤生态系统的各个土壤生态单元分别具有各自的地方气候、地形条件、土壤类型和资源优势，因此它们有着不同的经营方向。