考虑渗流压力梯度时低渗岩土固结控制方程的解析解

基于波动采油技术背景,对初始状态饱和渗流流体低渗岩土的固结控制方程进行了半解析求解。Laplace变换与迭代消去后的一维或径向模型固结控制方程为包含变参量的四阶常(变)系数非线性偏微分方程。通过流体位移解指数形式假设与微分高阶项消除,转换为关于替换系数的特征方程求解,最终得到关于Laplace变换域内的流体位移通解。Matlab编程与数值算例表明,考虑初始渗流压力梯度项时,弹性波作用下低渗孔隙介质的渗流物性变化幅度明显增大.

露天开挖及疏水引起的地面沉降及变形

露天矿山边坡岩土体疏水所引起的地表沉降及变形，往往大于开挖本身引起的沉降及变形．应用随机介质理论，假设岩土移动过程符合Ｍａｒｋｏｖ过程，再利用叠加原理，导出了露天开挖及岩土疏水导致的地表沉降及变形计算方法．计算获得的疏水导致的地表移动大小及范围均大于开挖引起的地表移动大小及范围．分析计算结果与Ｍｏｒｗｅｌ露天褐煤矿的监测资料的对比令人满意．

聚苯混凝土墙体材料影响因素分析

聚苯混凝土墙体材料是由岩土固结剂和聚苯颗粒按比例拌制而成的复合材料;岩土固结剂和聚苯颗粒作为聚苯混凝土墙体材料中的两种主要成分,对整个系统起着关键性的影响。这里对聚苯混凝土墙体材料性能和施工的影响因素进行了分析总结。

Coefficient of consolidation by end of arc method

One of the most important issues in geotechnical engineering is excess pore pressure caused by clay soil loading and consolidation. Regarding uncertainties and complexities, this issue has long been the subject of attention of many researchers. In this work, a one-dimensional consolidation apparatus was equipped in a way that pore water pressure and settlement could be continuously read and recorded during consolidation process under static loading. The end of primary consolidation was obtained using water pressure changes helping to present a new method for determining the end of primary consolidation and consolidation coefficient. This method was then compared with two classical theory methods of lg t and t. Using Terzaghi's theory, the way of pore pressure dissipation for lg t, t and the new method was found and compared with experimental results. It is concluded that the new method has better results.