逐级加荷条件下公路路基沉降变形监测仿真  

Monitoring and Simulation of Settlement and Deformation of Highway Subgrade under Step by Step Loading

作　　者：沈世鑫[1] 张有明 SHEN Shi-xin;ZHANG You-ming(school of civil and transportation engineering,Qinghai Minzu University,Xining 810007,Qinghai,China)

机构地区：[1]青海民族大学土木与交通工程学院,青海西宁810007

出　　处：《计算机仿真》2021年第6期88-92,共5页Computer Simulation

摘　　要：传统方法未能考虑计算土体固结度与沉降应力,导致公路路基沉降变形监测精准度低、监测效果差,影响公路建设的施工进度。提出逐级条件下公路路基沉降变形监测的方法。首先引入屈服准则构建理想弹塑性本构模型,分析逐级加荷下增量应力的途径,使监测更加稳定;采用自动网格划分法对公路路基进行有限单元网格划分,建立有限元分析模型,再通过上述模型得到公路的有限元参数、计算其固结度与沉降应力,再对沉降应力进行变换得到最终沉降量,实现公路路基沉降变形监测。实验对比结果表明,所提方法在实践中有着优秀的实时性、稳定性和准确性,并且拥有良好的监测效果。Due to the neglect of soil consolidation degree and settlement stress, the traditional method has many defects, such as low accuracy and poor monitoring effect. Therefore, this paper puts forward a monitoring method of highway subgrade settlement deformation under the condition of step by step. First of all, in order to analyze the way of incremental stress under step-by-step loading and make the monitoring more stable, the yield criterion was introduced to establish an ideal elastic-plastic constitutive model. Secondly, the automatic mesh generation method was used to divide the finite element mesh of highway subgrade, establishing the finite element analysis model. Then, based on the model, the finite element parameters, the consolidation degree and the settlement stress of the highway were obtained. Eventually, the final settlement was obtained by the transformation of settlement stress, thus achieving the highway subgrade settlement deformation monitoring. The results show that the method has excellent real-time performance, stability, accuracy and monitoring effect.

关 键 词：有限元分析模型 固结度与沉降应力 屈服准则 弹塑性本构模型 应力应变关系 

分 类 号：TU44[建筑科学—岩土工程]