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以安新高速改扩建拼接试验段为工程背景,采用土工离心模型试验,对新老路基拼接时以土工格室为主的多种土工合成材料加筋方案进行预测与对比,分析了拓宽高速公路老路基固结沉降和新老路基拼接后表面沉降的变化规律。试验结果表明:对新老路基,填筑期的路基沉降在半年内总沉降中均占相当大的比例,在70%以上;加筋后路基的沉降小于不加筋路基,且各方案的路基顶面最大和最小沉降均分别发生在新路基路肩边缘和老路基中心;由于地质条件良好,总体沉降并不大,各加筋方案之间的沉降无明显差异,均保持在较小水平,最小和最大沉降分别为1.67 cm与3.33 cm,最大差异沉降为1.66 cm。可见,加筋能均衡路基的不均匀沉降,并在一定程度上减小地基的总沉降。
Taking Anshun high-speed reconstruction and splicing test section as the engineering background, the geotechnical centrifuge model test was used to predict and compare the geosynthetics-based reinforcement schemes of geosynthetics in the splicing of new and old subgrade. The regularity of surface subsidence after settlement of old embankment and new and old subgrade. The test results show that for the new and old subgrade, the subgrade settlement in the filling period accounts for a considerable proportion of the total subsidence within half a year, more than 70%; the settlement of the subgrade is smaller than that of the subgrade without reinforcement, and the subgrade The maximum and minimum settlement of the top surface occurred at the shoulder edge of the new subgrade and the center of the old embankment, respectively. Because of the good geological conditions, the overall settlement was not large, and there was no significant difference between the subsidences of the reinforcement schemes, both at a small level and the minimum And the maximum settlement were 1.67 cm and 3.33 cm, respectively, with the maximum difference of 1.66 cm. It can be seen that the reinforcement can balance the uneven subgrade settlement and reduce the total subsidence of the foundation to a certain extent.