Three laboratory model tests were conducted to investigate the effects of electroosmosis drainage in different electrode configurations.The drainage,settlement,pore water pressure,and current were monitored in the process of electroosmosis.The water content and shear strength of the soil were obtained after electroosmosis,in order to study the effects of electrode configuration on electroosmosis reinforcement.The experimental results show the following: the effects of drainage and reinforcement by electroosmosis significantly improved with the increase of the number of anodes around a cathode,the current exhibited exponential attenuation with time,and there was a linear relationship between energy consumption and drainage discharge per unit volume.

Based on the mechanical theory of unsaturated porous media, an equation of electroosmostic consolidation theory which considers the coupling of electrical field, seepage field and stress field is derived by applying the principles of charge and mass conservation, stress equilibrium equation, Darcy's law and Ohm's law. The equation is discretized by using the Galerkin method of weighted residuals to get the formulation for finite elements; and then a code is developed. A model test of the electroosmosis combining with vacuum drainage is simulated. The simulated results agree well with the measured ones; it is shown that the proposed theory can predict the development of pore water pressure and displacements quantitatively in the electroosmosis consolidation process.

The swelling force is generated in the case of swelling deformation caused by that when moistening is constrained.Many researches have verified that the swelling force is significantly related to the initial water content and dry density.In order to further understand the development of the swelling force,the constant volume test method was adopted to measure the swelling force of 40 expansive samples which were made according to the different initial water content and dry density.It is found from the experiment that logarithm of the swelling pressure is linear with the initial water content and dry density.The function of relationship between them was obtained.Moreover,on the base of relationship between swelling quantity and applied pressure which has been studied,the calculation method of swelling pressure considering vertical pressure was proposed.At last,the proposed function was verified by the comparison between predict values and experimental values.In general,the results of this study can provide an instruction to the stability analysis of structures in the regions of expansive soils widely distributed.

通过分析华能澜沧江水电收益专项资产管理计划,提出我国开展水电资产证券化融资的一些建议.该项目通过资产证券化平台,采用超额抵押、现金储备、优先/次级等内部信用增级和农业银行提供不可撤销担保的外部信用增级方式,保障了投资者的利益,降低了投资者的风险,同时为华能澜沧江水电有限公司带来了20亿元的低成本资金,有效地降低了融资成本,为拓宽我国水电建设融资渠道、扩大融资规模做了一次有益的实践.