基于半变异函数的路基压实度均匀性评价方法

发布时间：2018-08-09 12:58

【摘要】：土体压实质量是决定公路,铁路,机场跑道等土工构造物长期稳定性的重要因素。目前压实质量检测方法主要是传统的局部取样点测法,在进行压实质量均匀性评价时,多采用变异系数概率统计指标C_V作为评价指标,未能考虑检测数据的空间变异特性,难以从空间分布的角度评价路基压实质量的不均匀性。基于半变异函数模型,提出能够评价压实度空间分布的均匀性指标U_V。以PFWD检测指标为计算对象,分别采用新旧两种均匀性评价方法对某客运专线试验段路基的PFWD检测结果进行压实均匀性评价。结果表明:与旧指标C_V相比,新指标C更能客观反映填筑路基压实度在空间上的不均匀性,其结果为路基压实均匀性评价提供了新的思路。
[Abstract]:Soil compaction quality is an important factor to determine the long-term stability of geotechnical structures such as highway, railway, airport runway and so on. At present, the method of compaction quality detection is mainly the traditional local sampling point test method. In the evaluation of compaction quality uniformity, the probability and statistical index of coefficient of variation (CV) is used as the evaluation index, and the spatial variation characteristics of the test data are not considered. It is difficult to evaluate the heterogeneity of subgrade compaction quality from the angle of spatial distribution. Based on the semivariogram model, a uniform index UVV, which can evaluate the spatial distribution of compactness, is proposed. Taking the PFWD detection index as the calculating object, the compaction uniformity of the subgrade of a passenger dedicated line was evaluated by using the new and the old two homogeneity evaluation methods for the subgrade of the test section of the passenger dedicated line. The results show that the new index C can objectively reflect the spatial heterogeneity of the compaction degree of embankment compared with the old index C _ V, and the result provides a new idea for the evaluation of compaction uniformity of roadbed.
【作者单位】：长沙市规划勘测设计研究院;中南大学土木工程学院;
【基金】：国家自然科学基金面上项目(51478481) 铁道部科技研究开发计划(2010G018-B-3-2)
【分类号】：U416.1

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