地基表面侧向变位的计算

本文提出的估算地基表面侧向变位的方法可用于以下情况：（1）当垂直均布荷载或水平均布荷载作用于矩形面积上时；（2）当垂直均布荷载或水平荷载作用于任意形状的面积上时。对于上述第1种情况，本文已将地基侧向变位系数制成表格，使实用简化。对于第2种情况，本文绘制了三个影响图，颇似N.M.Newmark教授用于计算弹性地基垂直变位的影响图。当荷载作用于任意形状的面积上，使用本文的影响图可十分简便地估算地基表面的侧向变位。

当均布垂直荷载作用时半无限弹性体内侧向变位的计算

文献［１］提出了计算地基表面侧向变位的方法，本文则就均布垂直荷载作用的情况下，提出了计算半无限弹性体内侧向变位的方法，可作为文献［１］的补充。

侧向变位PHC管桩竖向承载力的分析与计算

近年来,对PHC管桩的各项性能的研究已日趋完善,但对于侧向变位PHC管桩的承载力研究的较少。实际工程中的基桩大都处于非理想受荷状态,各种的侧向变位对承载力有不同程度的影响。当入土的管桩在施加竖向荷载前存在一定的倾斜时,所施加的荷载就会在桩身中造成附加弯曲变形。本文分别以PHC管桩桩身截面抗拉、抗压强度为强度控制因素,应用横向受荷桩的通解法计算不同倾斜情况下管桩的内力矩,再结合竖向荷载推导承载力公式。

筑堤地基的粘弹塑性分析

介绍了软土地基变形的时间依赖性及蠕变效果,采用修正剑桥模型对软黏土进行了弹塑性分析,并在修正剑桥模型基础上考虑了次固结指数α的影响,提出了表现粘弹塑性性质的JL模型,对计算值与试验结果进行了对比分析,分析结果较好地反映了实测结果。

The research progress on lateral shift of reflected electromagnetic wave at the interface of two conductive media

In this paper the research status of lateral shift of reflected electromagnetic wave at the interface of conductive media was reviewed, the lateral shift and the lateral delay were analyzed, and the charac-teristic of lateral shift curves varying with the angle of incidence was introduced in detail. For electro-magnetic wave logging, the error correction method of lateral shift was stressed in this paper, the magnitude of measured errors caused by the lateral shift was established. It is noticed that the longer wavelength, the larger error of measured results. With respect to the effect of lateral shift, the problem which still needs to be settled in the measurement of electromagnetic wave, as well as prospects on the further research and applications of lateral shift are described.