下层土

Lower the existing soil and emerging into the soil parent material (such as volcanic ash and alluvium, as well as eroded soil) on, are actively engaged in the process of soil formation.

在现有土壤的下层和新出现的成土母质（如火山灰和冲积物以及被侵蚀的土壤）上，都在活跃地进行着成土过程。

When the ratio of compressive modulus of superstratum and substratum is less than 3,academic diffused angles of natural subgrade with soft substratum under pressure in this paper are investigated.

对上下层土压缩模量比小于3的软弱下卧层的压力扩散角进行了研究，得出了扩散角理论值，可供相应工程参考。

With vertical-section analysis, in the later of experiment, naked terra and wheat land make content of soluble salt high in 0～20cm,and decreasing with deepening of soil-layer; the content value of planting two-year-old Onobrychis viciaefolia 、one-year-old Onobrychis viciaefolia 、interplanting and sequential cropping in the every soil-layer is equal; in harvest, only planting wheat and interplanting display content of soluble salt is high in middle-layer (20～60cm) and low in surface and down layers(0～20cm,60～80cm).

土壤垂直剖面分析，试验末期裸地的土壤盐分表现为0～20cm 土层高，随土层深入含量逐渐降低；二年生红豆草、一年生红豆草、套种和复种处理的土壤盐分均表现出各层含量近似相等的特征；小麦收获期，单作小麦和小麦套种地各土层的可溶性盐含量均表现为中层(20～60cm)高、上下层(0～20cm 和60～80cm)低的特征。

A large amount of nitrogenous fertilizer that is not absorbed by crops or evaporated into the air is easily leached transport and accumulated in the shallow vadose zone. The accumulated nitrogen is released again and leached down into subsoils and groundwater, causing pollution. The process is mainly affected by climate, soil structure and microorganism transformation, etc.

田间施肥后，未挥发和被作物吸收的剩余N素易淋失运移，引起在浅层包气带土壤中的蓄积，且又易再释放进入下层土或地下水中形成污染，并主要受气候、土质结构、微生物作用等的影响。

Some conclusions are drawn as follows: The total tendency of socles is basin-shaped settlement which is bigger in the middle position socles than the peripheral position socles before the pile foundation underpinning. Pile foundation underpinning augments the differential settlements. After soil excavation, middle position socles rebound obviously owing to unloading action, which lessens the differential settlements between middle and peripheral position socles.

从沉降分析的结果可以看出：桩基托换前，地基总的沉降趋势是中间部位柱脚大于周边部位柱脚的&盆式沉降&；桩基础托换后，柱脚处的沉降差进一步增大；土方开挖后，由于下层土被&卸载&，中间部位柱脚处的地基明显回弹，使得中间部位柱脚与周边部位柱脚的沉降差出现了减少的趋势。

First,the 3-d dynamic equations in cylindrical coordinate for transversely isotropic saturated soil were transformed into a group of governing differential equations with 1-order by the technique of Fourier expanding with respect to azimuth,and the state equation was established by Hankel integral transform method,furthermore the transfer matrixes within layered media were deriv...

首先，通过方位角的Fourier变换，将圆柱坐标系下横观各向同性饱和土的三维动力方程转化为一阶常微分方程组，基于径向Hankel变换，建立问题的状态方程，求解状态方程后得到传递矩阵；其次，利用传递矩阵，结合层状饱和地基的边界条件、排水条件及层间接触和连续条件，给出了任意简谐激振力作用下层状横观各向同性饱和地基动力响应的通解；然后，按混合边值问题建立层状饱和地基上弹性圆板非轴对称振动的对偶积分方程，并将对偶积分方程化为易于数值计算的第二类Fredholm积分方程，并给出了算例。

Chrysanthemum of 10 thousand birthday is lax to edaphic requirement, with the arenaceous qualitative loam with fecund, good drainage had better.

万寿菊对土壤要求不严，以肥沃。排水良好的砂质壤土为好。

He unstepped the mast and furled the sail and tied it.

他拔下桅杆，把帆卷起，系住。