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compression index
相关语句
  相似匹配句对
     index;
     指标;
短句来源
     Index
     索引
短句来源
     Compression and query processing methods of kind of index
     一种索引结构的压缩存储及其查询处理技术
短句来源
     Index compression technology based on reassigning document
     基于文档重排的索引压缩技术
短句来源
     mechanical compression;
     机械性压迫损伤组;
短句来源
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  compression index
Results of research are described, and an accelerated method proposed for determination of the compression index of soils, their maximum density, and the density in the dry state.
      
The need for quality control over soil compaction on the basis of a compression index is substantiated.
      
Relationships between root growth pressure and root size were computed for various combinations of bulk density, preconsolidation pressure, and values of the compression index in and beyond the range of preconsolidation.
      
Relationships between root growth pressure and root size were computed for various combinations of bulk density, preconsolidation pressure, and values of the compression index in and beyond the range of preconsolidation.
      
Methods are suggested for the determination of coefficients of Primary and Secondary consolidations and the compression index.
      
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Recently in China the effectiveness and advantage of the vacuum method of subsoil stabilization have been recognized. In this paper the Biot's consolidation theory was used to analyze the coupled consolidation and deformation of clay layers under vacuum in one of improved areas of 50 × 60m at Xingang Harbour. The subsoil in this area consists of three layers of soft clay with overall depth of 15m. Before applying vacuum sand drains with length of 10m were installed and the ground surface was covered with a thin...

Recently in China the effectiveness and advantage of the vacuum method of subsoil stabilization have been recognized. In this paper the Biot's consolidation theory was used to analyze the coupled consolidation and deformation of clay layers under vacuum in one of improved areas of 50 × 60m at Xingang Harbour. The subsoil in this area consists of three layers of soft clay with overall depth of 15m. Before applying vacuum sand drains with length of 10m were installed and the ground surface was covered with a thin layer of sand. The soils were modelled as an isotropically hardening plastic material. Two models were used, namely the well-known Cambridge model and the double yield surface model (NHRI-model in abbreviation) proposed by the first author of this paper. In addition,a simple elastic model using elastic bulk modulus calculated from the compression index was also used for comparison. The actual three-dimensional problem was simplified as a two-dimensional one by regarding the sand drains as thin sand walls. Computation was carried out in 24 time steps to simulate the vacuum drain process. The surface settlement and the inward lateral displacement of surrounding soils computed by use of simple elastic model and the NHRI-model are comparable to the measured ones, but the Cambridge model gives some lower values.

近年来真空排水预压加固软土地基的方法开始受到重视,但是关于真空作用的机理还缺乏一致的认识。本文用比奥(M.A.Biot)固结理论分析了新港一个50×60m的试验场地的软土层在真空作用下的固结变形过程。计算结果不但成功地解释了真空作用的机制,而且也大体与实测结果一致。

According to some common experiences, this paper discusses the way to find the compression index-the preconsolidation pressure PC, Cs, and Cc of soil layer with spline function and its derivatives. Those can be put into effect on a computer system. Applied B-spline function, the computions show high precision comparing hand-calculation. This way keeps the resultion on reliability, avoids the errors caused by changing scale of coordinnate system or experience selection. The compute and graph language programs...

According to some common experiences, this paper discusses the way to find the compression index-the preconsolidation pressure PC, Cs, and Cc of soil layer with spline function and its derivatives. Those can be put into effect on a computer system. Applied B-spline function, the computions show high precision comparing hand-calculation. This way keeps the resultion on reliability, avoids the errors caused by changing scale of coordinnate system or experience selection. The compute and graph language programs can be carried out on a computer system.

本文应用样条函数和其导数,试述了由室内压缩试验资料求出土的先期固结压力P_c以及压缩指数C_c和C_s的计算方法;并以三次样条函数的计算成果为例,说明了计算精度可靠,克服了手工计算由于坐标比尺、经验方法的选用而带来的误差,而且计算绘图程序通用。

Owing to the shortcomings involved in methods for calaulating the depth of settlement of foundation soil publihed in the foundation of the Industrial and Civil Building Code is the depth of the settlement is controlled by the ratio 0.025 of the settlement of soil layer one meter high at the floor of the settlement to the total settlement The paper puts forward a new method of computation in which the depth of the compressible layer is determined by the ratio 0.1 of the strain of foundation soil at the floor...

Owing to the shortcomings involved in methods for calaulating the depth of settlement of foundation soil publihed in the foundation of the Industrial and Civil Building Code is the depth of the settlement is controlled by the ratio 0.025 of the settlement of soil layer one meter high at the floor of the settlement to the total settlement The paper puts forward a new method of computation in which the depth of the compressible layer is determined by the ratio 0.1 of the strain of foundation soil at the floor of the settlement to the strain of the soil at the bottom of the foundation Both factors of compressibility of soil and the size of the foundation are taken into full ac count in this methods.The cmputation of the settlement is based on Mean Value Theorem and the compression indices are determined rationally in the p rocess of computation.

地基变形计算是土力学中尚在进行研究的课题.本文针对苏联建筑法规和我国规范的计算方法中存在的不足进行讨论改进,合理考虑土的压缩特性,提出新的计算方法.

 
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