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1.中国科学院 力学研究所,北京 100190
2.中国科学院大学 工程科学学院,北京 100049
[ "程鹏达(1983-),男,甘肃天水人,助理研究员,2012年于上海大学获得博士学位,主要从事流体-结构-岩土体多场耦合模型和地下工程灾害防治技术研究。E-mail: pdcheng@imech.ac.cn" ]
[ "冯 春(1982-),男,浙江富阳人,硕士,高级工程师,2009年于中国科学院研究生院获得工程力学硕士学位,主要从事连续-非连续耦合数值分析方法(CDEM)、复杂结构与岩土体耦合作用机理、车辆及冲击载荷下路面结构变形破裂特征等方面的研究。E-mail:fengchun@imech.ac.cn" ]
收稿日期:2022-07-27,
修回日期:2022-08-30,
纸质出版日期:2023-03-10
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程鹏达,冯春,常宁东等.基于CDEM-MPM耦合的软地面车辆侵入规律研究[J].光学精密工程,2023,31(05):707-718.
CHENG Pengda,FENG Chun,CHANG Ningdong,et al.Research on soft ground vehicle intrusion law based on CDEM-MPM coupling model[J].Optics and Precision Engineering,2023,31(05):707-718.
程鹏达,冯春,常宁东等.基于CDEM-MPM耦合的软地面车辆侵入规律研究[J].光学精密工程,2023,31(05):707-718. DOI: 10.37188/OPE.20233105.0707.
CHENG Pengda,FENG Chun,CHANG Ningdong,et al.Research on soft ground vehicle intrusion law based on CDEM-MPM coupling model[J].Optics and Precision Engineering,2023,31(05):707-718. DOI: 10.37188/OPE.20233105.0707.
载荷装备通过软土地面会引起了软土地面的变形,车轮侵入软土的深度是软土地面装备通行性评估的重要参数。本文提出了连续-非连续单元法(Continuum-discontinuum Element Method, CDEM)与物质点法(Material Point Method, MPM)耦合的数值计算方法,建立了车轮-软土地面耦合模型,模拟了车轮和软土地面相互作用过程,定量分析车轮载重、软土弹性模量、软土强度参数(黏聚力、摩擦角)与软土表面压应力、侵入深度等参数之间的关系,获得车轮侵入软土深度的变化规律。研究表明:软土侵入深度与车轮载重接近线性正相关,相对改变量约为179%;与弹性模量非线性负相关,相对改变量约为23%;与强度参数非线性负相关,相对改变量约为164%。当车轮载重一定时,非线性变化的车轮侵入深度对软土强度参数更敏感。建立强度参数(黏聚力、摩擦角)和侵入深度变化的三维关系,可为软土地面装备通行性评估中现场待测的关键参数提供理论依据。
Vehicles with varying loads deform soft-soil grounds, and the depth of their wheel intrusion is a crucial parameter for evaluating vehicle trafficability on soft soil. This study introduces a novel method that combines the Continuum-Discontinuum Element Method (CDEM) and Material Point Method (MPM) to create a coupling model of wheel and soft-soil interaction and simulate their interaction process. The model analyzes the relationship between different variables, including the wheel load; elastic modulus, strength parameters (cohesion and friction angle), and surface stress of the soft soil; and intrusion depth, to quantify the law of wheel intrusion depth on soft soil. The results indicate that the intrusion depth positively correlates with the wheel load, with a relative variation of approximately 179%, and negatively correlates with the elastic modulus and strength parameters in a non-linear manner, with relative variations of approximately 23% and 164%, respectively. When the wheel load is constant, the intrusion depth is more sensitive to the strength parameters of the soft soil. The three-dimensional relationship established between the strength parameters and intrusion depth provides a theoretical foundation for key parameter measurements in evaluating vehicle trafficability on soft soil.
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