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依据不同路段的实测数据,在理论层面,根据填方重力(包括车辆荷载)、填方内纵横向干湿梯度和温度梯度的变化,分析和探讨公路填方路堤边缘纵向开裂产生的机理.公路上填高路堤纵向开裂的形成机理,主要由路堤边坡干湿场和温度场的周期变化,使填方土体产生反复胀缩,导致路堤边坡表层带、过渡带部分土体强度降低,松散、蠕变,在土体重力和车辆动荷载的影响下发生侧向蠕滑,从而产生路堤边缘纵向开裂.在设计上应加强度填方路堤的侧向约束,修筑护脚墙,浆砌片石护坡,宽拱肋拱式护坡等,避免边坡土体侧向蠕滑.应加强有关高路堤纵向开裂形成机理和防治措施的深入研究工作.
According to the measured data of different road sections, the mechanism of longitudinal cracking at the edge of highway embankment is analyzed and discussed according to the gravity (including vehicle load), vertical and horizontal wet-dry gradient and temperature gradient in the fill, theoretically. The formation mechanism of vertical cracking of high embankment is mainly caused by cyclic change of wetting and drying field and temperature field of embankment slope, causing the expansion and contraction of soil in the embankment repeatedly, resulting in the decrease of strength of soil layer in the surface zone and transition zone of embankment slope, Loose and creep, lateral creep occurs under the influence of soil gravity and vehicle dynamic load, resulting in longitudinal cracking of the edge of embankment. In the design, the lateral restraint of embankment should be strengthened to build the footwall and grout Slope protection, arch arch slope protection and so on, so as to avoid lateral creep of slope soil. In-depth research work on formation mechanism and prevention measures of longitudinal cracking of high embankment should be strengthened.