【作者】 张稳；

【导师】 王亚玲；

【作者基本信息】 长安大学 ， 交通运输工程， 2011， 硕士

【摘要】 本文以乐宜高速公路宜宾段为依托工程,通过分析丘间谷地软土地基的成因与土层分布特性,选择采用塑料排水板法处理其软土地基；详细描述了软土路基试验方案(包括地表沉降、侧向水平位移、孔隙水压力以及土压力)和观测方法,并对现场观测结果进行了分析,结果表明：丘间谷地软基在外荷载作用下呈竖向压缩、侧向膨胀现象,但软基经过土工格栅和塑料排水板综合处理后,减小了土体在外荷载作用下的侧向挤压变形,即抗侧向变形能力增强；随着荷载的增加,孔隙水压力和土压力也随之增大,当荷载增大到一定的程度后,孔隙水压力的消散逐渐减小,土压力的增加较前期缓慢,且趋于稳定。可见塑料排水板法对丘间谷地软土地基处理效果良好,有效的提高了软土路基的稳定性和承载力。为了寻求软土路基沉降过程的变形规律,本文通过对软土路基沉降机理和规律的分析,采用灰色系统法、指数曲线法和双曲线法建立预测模型,分别对软土路基沉降过程进行了预测,结果表明：灰色系统法较之双曲线法与指数曲线法,能更好地符合实测数据,对预测路基未来的沉降值有较大的参考价值。同时,采用灰色系统法得到的最终沉降量预测值比双曲线法、指数曲线法预侧值大,说明该方法的预测值是偏于安全的,表明对工后沉降的要求更为严格。更多还原

【Abstract】 The thesis is based on leshan-yibin highway yibin section, through analyzing the cause of ravine soft soil foundation with soil distribution characteristics of plastic drainage plate, the choice method of dealing with the soft soil foundation;this paper gives detailed descriptions of the soft soil subgrade test plan (including the surface settlement and lateral horizontal displacement and pore water pressure and soil pressure) and observation methods, and the field observation results are analyzed, and the results show that:Ravine soft foundation in outer loads vertical compression, lateral expansion phenomenon, but the soft base after grille and plastic drainage plate after comprehensive treatment, the outer loads of soil lateral extrusion is reduced, namely the lateral deformation resistance ability enhancement; With the load increasing, the pore water pressure and soil pressure increases, when the load with increased to a certain extent, pore water pressure decreased gradually dissipate, soil pressure increases more slowly, and stabilize early. Visible plastic drainage plate ravine method of soft soil foundation high to deal with good effect and improves the soft soil subgrade stability and loading capacity.In order to seek soft soil subgrade settlement process of deformation, this paper through the soft soil subgrade settlement mechanism and regular analysis, by using grey system method, the index curve method and hyperbolic method to establish the prediction model respectively, the soft soil subgrade settlement process is forecasted, and the result indicates that the gray system method and exponential curve than hyperbolic method, can better meet method to predict the experimental data of roadbed future sedimentation value has great value of reference. Meanwhile, by using grey system method of the final settlement quantity prediction obtained than hyperbolic method, exponential curve method predicted value big, which shows that this method is the prediction that tends to safety, showed the requirements of settlement after more strict.更多还原