北京平原区软弱黏性土次固结系数的试验研究

次固结系数通常被认为是一个常数,然而,大量的实验数据表明,随着时间的改变次固结系数也发生着变化。同样,大量的试验表明次固结系数与固结压力、压缩指数、含水率以及塑性指数有着一定的相关性。本文在着重研究北京平原区软弱黏性土次固结特性的基础上,对其规律进行了总结和分析。结果表明:对超固结土,次固结系数随荷载的增大而增大; 对正常固结土,次固结系数随荷载增大而减小。次固结系数亦随着土样含水率和塑性指数的增长呈线性增长趋势,且Cα/Cc比值为常数。     

LN-24YSJC型实时压缩纠错系统的研制

介绍了一种适用于有线传输、无线传输的各类数字地震台及台网使用的24位地震数据采集器数据传输纠错设备。本文阐述了该仪器的工作原理、硬件结构和主要功能。     

北京大兴规划新城地面沉降研究

本文分析研究了大兴规划新城地面沉降发育特点、成因机理及影响因素,建立模型预测了地面沉降发展趋势,为未来新城建设规划以及地质灾害防治,提供了科学依据。     

东南海岸带海相软土的Cc~n关系

收集整理了国内学者给出的我国东南海岸带不同地区（上海、连云港、广州、深圳、浙江沿海、渤海湾）海相沉积软土的8个Cc与n统计关系式,并根据公开发表的资料增加了这些地区以及沿海其他地区（天津、温州）260个的Cc～n数据,进行了东南海岸带软土的统一分析。发现Cc～n间存在较好的线性关系,具体关系大致可以分为陡变型和缓变型2类,缓变型与国外一些学者给出的统计结果较为接近。本文还对比了两种质量的上海软黏土的试验结果,分析了土样扰动对Cc～n统计关系的影响。     

COMPRESSION OF nth-ORDER DATA ARRAYS BY B-SPLINES.PART 1:THEORY

For efficient handling of very large data arrays,pretreatment by compression is mandatory.In the presentpaper B-spline methods are described as good candidates for such data array compression.Themathematical relation between the maximum entropy method for compression of data tables andthe B-spline of zeroth degree is described together with the generalization of B-spline compression tonth-order data array tables in matrix and tensor algebra.     

用抗剪强度参数估算抗拉强度的方法与问题讨论

因为多数岩石具有各种结构面,岩石力学试验强度参数多是离散的,所以岩石力学试验获得的参数具有估算的性质。根据单轴压缩实验Mohr圆破裂面的法向压力为零、即是与轴向压力方向一致的破裂面,导出压力劈裂圆的抗拉强度公式,用该公式计算了14个岩土试验的抗拉强度,并与这些岩土的Brazil劈裂试验和直接拉伸试验的抗拉强度进行比较,其相对误差一般都在20%以内,从岩土试验参数离散性角度看,压力劈裂圆公式具有实用价值。讨论了拉应力圆在Mohr-Coulomb准则下的负轴方向实际上不存在0轴压下的单向拉伸、即对柱状试件不会发生圆周拉张破坏模式,所以ISRM建议的t=f（3）作图回归法、以及多种根据Mohr拉应力圆几何关系导出的其他公式计算法存在计算抗拉强度偏大问题。分析指出了与单轴压缩实验3种破坏模式相应的应力圆及其应力范围。     

REPRESENTATION OF SPECTRA BY CONTINUOUS FUNCTIONS

A general framework for manipulating spectra as functions in traditional multivariate methods such asPCA and PLS is described.The functional representation is very convenient for compression,ensuringsmoothness and continuity.There are two fundamentally different types of representations:(a)byfunctions and(b)by function coefficients.The use of coefficients is the most practical way of analysis.     

云南剑川新民铁矿地质及成因

新民铁矿位于北北西—南南东向雪龙山—桥后断裂（弥沙河断裂）东侧之云岭褶皱束三级构造单元中,赋矿层位为中三叠统上兰组下亚段泥质灰岩.地层、构造控矿,为沉积—后期改造型铁矿床.     

Mapping efficiency and information content

This paper proposes two compound measures of mapping quality to support objective comparison of spatial prediction techniques for geostatistical mapping: (1) mapping efficiency – defined as the costs per area per amount of variation explained by the model, and (2) information production efficiency – defined as the cost per byte of effective information produced. These were inspired by concepts of complexity from mathematics and physics. Complexity i.e. the total effective information is defined as bytes remaining after compression and after rounding up the numbers using half the mapping accuracy (effective precision). It is postulated that the mapping efficiency, for an area of given size and limited budget, is basically a function of inspection intensity and mapping accuracy. Both measures are illustrated using the Meuse and Ebergötzen case studies (gstat, plotKML packages). The results demonstrate that, for mapping organic matter (Meuse data set), there is a gain in the mapping efficiency when using regression-kriging versus ordinary kriging: mapping efficiency is 7% better and the information production efficiency about 25% better (3.99 vs 3.14 EUR B⁻¹ for the GZIP compression algorithm). For mapping sand content (Ebergötzen data set), the mapping efficiency for both ordinary kriging and regression-kriging is about the same; the information production efficiency is 29% better for regression-kriging (37.1 vs 27.7 EUR B⁻¹ for the GZIP compression algorithm). Information production efficiency is possibly a more robust measure of mapping quality than mapping efficiency because: (1) it is scale-independent, (2) it can be more easily related to the concept of effective information content, and (3) it accounts for the extrapolation effects. The limitation of deriving the information production efficiency is that both reliable estimate of the model uncertainty and the mapping accuracy is required.     

应用三分量浅层地震反射方法探测隐伏活动断裂

多波多分量地震勘探方法在油气田勘探开发中日益受到重视,但在工程和活动断裂探测中过去还没有开展多波多分量地震勘探的先例.本文简要介绍了在北京黄庄—高丽营断裂上开展的三分量浅层地震反射试验数据采集和资料处理方法,以及取得的初步结果.试验结果表明,采用纵波震源或横波震源激发、三分量接收的浅层地震勘探方法,可获得较高信噪比的浅层地震纵波、横波和转换波剖面,特别是水平分量采集的横波和转换波可提供很有意义的地下结构和构造信息.综合利用纵波、横波和转换波剖面特征进行的地质分层和断层解释结果取得了与跨断层的钻孔联合地质剖面结果较好的一致性.