hardpan

1. For the need of earthquake microzonation some studies on the dynamic properties of hardpan in west Anhui were conducted.
   本文结合地震小区划的需要对皖西硬粘土的动力特性进行了一些研究。
2. Application of SH wave reflection method in researching the transitional change of hardpan in the eastern and western Shanghai
   横波反射法在研究上海东西部硬土层过渡变化中的应用
3. The most important problems research had to solve were: ( 1). build-up and maintenance of soil fertility;( 2). avoid soil hardpan and ( 3). control soil erosion.
   研究要解决的最重要问题是：（）累和维持土壤肥力；（）免土壤硬磐；（）制土壤侵蚀。
4. The microstructure of hardpan is described through observation of electronic microscope and its effect on the mechanical properties is analyzed.
   通过电镜扫描分析了微观结构对硬粘土力学性质的影响。
5. In this paper, the hardpan roughness of paddy field was measured, autocorrelation and power density spectrum were analyzed.
   阐述田间试验测出水田沟底不平度及其自相关和功率谱密度分析；
6. Construction Technique of Soft Foundation Improvement Under Thick Hardpan
   厚硬土层下软土地基处理施工技术
7. Combine practicing experience for many years, author discusses construction technique for hardpan steady used water and problem playing attention.
   作者结合多年工程施工实践，论述了水稳砂砾层的施工工艺及在施工中应注意的问题。
8. From the shear wave velocity by boring and dynamics triaxial test the relation of shear stress-strain confirms to hyperbola, and the shape of hyperbola depends on the state of fissures distributing in hardpan.
   从现场单孔检层法测定的剪切波速及室内动三轴试验结果，得出硬粘上的应力应变关系符合双曲线模式，其形态与土样裂隙分布状态有关。
9. Statement of construction technique for hardpan steady used water
   浅谈水稳砂砾层的施工工艺
10. The study provided the variation range of paddy field hardpan roughness and the effective frequency of the hydraulic copying system.
    试验研究提供了水田沟底不平度变化范围以及可以实用的插秧机液压仿形系统的仿形频次。
11. But on the hardpan or sands, pipe-drived pile has almost same or lower number compared with bored pile because of sand's liquefaction.
    但在粉砂细砂层，由于振动沉管桩导致的地基土液化，沉管桩与钻孔桩的取值基本持平，或略低。
12. Calculation of stress stiffness and effective area of diaphragm with hardpan
    带硬芯膜片的应力、刚度和有效面积的计算
13. Dynamic Properties and Earthquake Response of Hardpan
    硬粘土的动力特性及地震反应

noun

1. crust or layer of hard subsoil encrusted with calcium-carbonate occurring in arid or semiarid regions

   Synonym:    caliche