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基于川藏公路南线(西藏境国道318线K3473+000~K4670+000和国道214线K1324+000~K1473+000)的实地调研成果,采用Midas/GTS建立边坡稳定数值模型,分析坡形因素即坡顶平台宽度、坡高、坡度、两级边坡对松散堆积体路基上边坡稳定性的影响。在改变单级边坡坡度和坡高的条件下,分析了松散堆积体路基上边坡安全系数及坡体应力、最大剪应变、坡体位移在坡中、坡脚处的变化趋势。模拟结果表明,分级边坡可以较明显地提高松散堆积体边坡的稳定性。相较于上级边坡坡度变化对于坡体安全系数影响而言,下级边坡坡度变化导致坡体安全系数变化更为明显。
Based on the field survey results on the south of Sichuan-Tibet Highway (K3473 + 000 ~ K4670 + 000 on State Road 318 of Tibet National Highway and K1324 + 000 ~ K1473 + 000 on State Road 214), Midas / GTS was used to establish slope stability numerical model to analyze slope Factors such as the width, slope height and slope of the platform on the top of the slope affect the stability of the slope on the loose pile embankment. Under the condition of changing the slope and slope height of single-stage slope, the safety factor and the stress of slope, the maximum shear strain and the displacement of slope on the slope and slope foot are analyzed. The simulation results show that the graded slope can obviously improve the stability of loosely packed slope. Compared with the slope change of the upper slope, the changes of the slope slope of the lower slope lead to the more obvious change of the slope safety factor.