【作者】 霍海峰；

【导师】 雷华阳；

【作者基本信息】 天津大学 ， 结构工程， 2009， 硕士

【摘要】 随着我国公路建设的迅猛发展,交通荷载所引起的岩土工程问题日益受到岩土工程学者们的关注。尤其是对于修建在软土地区的高速公路,由于在交通荷载作用一定深度范围内,地基中软土层受到附加荷载的作用,会产生新的沉降。因此,对于交通荷载作用下饱和软粘土动态特性的研究十分必要。本文在以往研究的基础上,着重开展了对天津软粘土的动力特性试验研究。通过室内静力试验,分析了天津软粘土的静力学特性。确定了先期固结压力及结构屈服应力。并以此为基础进行了不同条件下的动三轴试验研究,通过试验分析总结了天津软粘土的动力特性变化规律,建立了循环荷载作用下软粘土中孔压发展的经验模型,该孔压模型综合考虑了围压,动应力,频率,循环振次的影响。对于单层软土地基土体研究了一维非线性固结的数值解法。采用MATLAB计算软件编制了相应的程序,得到了方程的数值解。为在饱和软粘土上修筑高等级公路设计和施工提供了有益的参考依据。更多还原

【Abstract】 With the rapid development of city transportation in China,we have paid more attention to the geotechnical problems caused by the traffic loads. Especially for the highway built on the soft areas, as the soft layer in the depth of traffic load’s action is impactted by the additive loads,a new settlement will be introduced. So it is essential to study on the soft soil’s dynamic characters under the traffic loads. Based on the achievement got by the former scholars,a research on the Tianjin soft clay under traffic loads was made. The main work of this thesis is about the dynamic property of Tianjin soft soil.By conducting indoor static test,we have analysed the static property and got the preceding consolidation pressure and fabric yield stress. Based on the achievement got in the indoor dynamical triaxial test,the rules of Tianjin soft clay’s dynamic characters have been obtained, and an empirical pore pressure model of soft clay under cyclic loading , involved with confining pressure, dynamic stress,and cycle frequency, was established. Numerical analysis about monolayer foundation under traffic loads was developed. And the numerical solution was obtained through the corresponding procedure with MATLAB. All these provide useful basis for the design and construction about highway built on the soft soil.更多还原