考虑固结作用的软土地基上灰堤的稳定性分析

Stability Analysis of Ash Embankment with a Soft Foundation Considering the Consolidation

通过对某软土地基上灰堤分级加载的数值模拟,并与某有限元软件和有效固结应力法计算结果进行对比,验证有限元软件Geo-studio考虑固结作用稳定计算结果的合理性;计算结果表明,超孔隙水压力的变化符合堆载预压的规律;灰堤施工期稳定安全系数受固结时间和渗透系数的影响,安全系数随固结时间或渗透系数的增加而逐渐增大;设置塑料排水板(prefabricated vertical drain,PVD)提高区域内软土的渗透系数,增大灰堤的安全系数。

A numerical model is established based on a staged constructed ash embankment with a soft foundation,by comparison with the results of software and effective consolidated stress solution,it proves the rationality of stability analysis considering the consolidation using finite element software Geo-studio.It is found that the change of excess pore water pressure conform the rule of preloading.The stability safety factor in construction period of ash embankment is influenced by consolidation time and permeability coefficient,the safety factor will rise with the increase of consolidation time or permeability coefficient,the PVD increases the permeability coefficient in a special area,and rises the stability safety factor of ash embankment.