| 基于尖点突变理论的软岩弃渣路堤局部稳定性分析 |
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| 引用本文： | 鞠兴华,杨晓华,张莎莎.基于尖点突变理论的软岩弃渣路堤局部稳定性分析[J].水文地质工程地质,2019,0(6):112-118. |
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| 作者姓名： | 鞠兴华 杨晓华 张莎莎 |
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| 作者单位： | 1.潍坊学院建筑工程学院，山东 潍坊261041;2.长安大学公路学院，陕西 西安710064 |
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| 基金项目： | 国家自然科学基金资助项目（51209006） |
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| 摘 要： | 为充分利用现场材料资源，达到节约成本的目的，文章基于筛分试验、击实试验、承载比试验（CBR试验），分析了软岩弃渣的工程特性；其次，以路基沉降监测为基础，采用尖点突变理论分析路基填筑后的稳定性；再利用粒子群优化极限学习机模型（PSO-ELM）对路基变形进行预测，以评价路基稳定性的发展趋势。研究结果表明:成武高速的软岩弃渣具有较好的级配，且最优含水率条件下的CBR值符合路堤设计要求，说明软岩弃渣作为路基填料的可行性；在现场监测结果中，Ⅰ号监测断面的最大沉降量为71.3 mm，Ⅱ号监测断面的最大沉降量为61.4 mm；在尖点突变理论的整体稳定性分析中，两监测点的突变特征值均大于零，路基处于稳定状态；同时，在分阶段的稳定性分析中，不同阶段的突变特征值也大于零，并随沉降时间的增加，突变特征值具减小趋势，得出路基在不同沉降阶段也处于稳定状态；通过变形预测，得出两监测点均具有较高的预测精度，验证了PSO-ELM模型在路基变形预测中的适用性，并得出路基稳定性的发展趋势趋于稳定，验证了软岩弃渣在路基填筑中具有适用性。
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| 关 键 词： | 软岩 路堤 弃渣 填筑参数 尖点突变理论 稳定性评价 |
| 收稿时间： | 2018-12-07 |
| 修稿时间： | 2019-03-05 |
An analysis of local stability of soft rock cinder embankment based on the cusp catastrophe theory |
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| JU Xinghua,YANG Xiaohua,ZHANG Shasha.An analysis of local stability of soft rock cinder embankment based on the cusp catastrophe theory[J].Hydrogeology and Engineering Geology,2019,0(6):112-118. |
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| Authors: | JU Xinghua YANG Xiaohua ZHANG Shasha |
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| Affiliation: | 1.College of Architecture and Engineering, Weifang University, Weifang, Shandong261041, China;2.School of Highway, Chang’an University, Xi’an,Shaanxi710064, China |
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| Abstract: | In order to make full use of insitu material resources and achieve cost savings, this paper analyzes the engineering characteristics of soft rock waste slag based on screening test, compaction test and CBR(Califonia Bearing Ratio Test)test. Based on subgrade settlement monitoring and by using point mutation, the stability of the roadbed after the foundation is theoretically analyzed, and the roadbed deformation is predicted with the PSO-ELM (Particle Swarm Optimization for Limit Extreme Learning Machine) model to evaluate the development trend of the roadbed stability. The results show that the Chengwu high speed soft rock slag has good gradation, and the CBR value under the optimal water content is in line with the requirements of embankment design, indicating the feasibility of soft rock slag as subgrade filler. The field monitoring results show that the maximum settlement of No. I monitoring section is 71.3 mm, the maximum settlement of No. II monitoring section is 61.4 mm. In the holistic stability analysis of cusp catastrophe theory, the mutation characteristic values of the two monitoring points are all greater than zero and the subgrade is in a stable state. At the same time, in the stage of stability analysis, the sudden change characteristic values of different stages are greater than zero, and with the increasing of the settling time, the sudden change characteristic value decreases, and a way out is obtained. The foundation is also in a stable state in different settling stages. Through the deformation prediction, the two monitoring points are of high prediction accuracy. The applicability of the PSO-ELM model in the prediction of subgrade deformation is verified, and the development trend of the stability of the subgrade tends to be stable, and the applicability of the soft rock residue in the subgrade filling is verified. |
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