Calculation of vehicular load-induced plastic deformation of soft subsoil

SHEN Hao; TANG Xiao-wu; NIU Ben; LIU Xu

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Calculation of vehicular load-induced plastic deformation of soft subsoil

更新时间：2026-06-25

- Calculation of vehicular load-induced plastic deformation of soft subsoil
- Vol. 34, Issue 12, (2013)
- 作者机构：
  
  1. 浙江大学软弱土与环境土工教育部重点实验室,杭州,310027
  2. 比利时根特大学岩土工程实验室，根特,9000
  3. 中冶集团武汉勘察研究院有限公司,武汉,430080
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU443
- Online First：19 December 2013，
  
  Published：2013
- 稿件说明：
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SHEN Hao, TANG Xiao-wu, NIU Ben, et al. Calculation of vehicular load-induced plastic deformation of soft subsoil[J]. 2013, 34(12).
DOI：

SHEN Hao, TANG Xiao-wu, NIU Ben, et al. Calculation of vehicular load-induced plastic deformation of soft subsoil[J]. 2013, 34(12). DOI：

摘要

对于低路堤公路，合理地预测车辆荷载引起的地基塑性累积变形对于低路堤公路的设计有着重要的意义。从机制上讲，可将地基的塑性应变分为塑性体积应变和塑性剪切应变。其中对于塑性体积应变，提出采用不排水条件下的残余孔压模型与一维固结理论相耦合进行计算；对于塑性剪切应变，考虑了塑性体积应变引起的土体硬化，提出了修正的塑性剪切应变计算模型。然后基于所提模型，对萧山黏土的不排水与排水条件下的动三轴试验进行模拟，初步验证了所提模型的有效性。对于实际工程问题，首先运用数值的方法求得车辆荷载在地基中引起的附加应力，然后运用所提模型计算各土层的塑性应变，再结合分层总和的方法求得地基的累积塑性变形。以日本佐贺机场1号测点为例，说明了模型在工程边值问题中的有效性。

Abstract

For a low embankment road

the reasonable prediction of vehicular load-induced plastic deformation plays an important role in the road design. According to the mechanism of vehicular load-induced plastic strain

the plastic strain comprises two parts: plastic volumetric strain and plastic shear strain. In the calculation of plastic volumetric strain

the dissipation equation with a source term

which couples Terzaghi’s consolidation theory with the experimentally-achieved cumulative pore pressure model under undrained condition is adopted. While in the calculation of plastic shear strain

the hardening factor of plastic volumetric strain is taken into consideration. The validity of the model is verified by the dynamic triaxial test results of saturated clay under undrained and drained condition. For practical problems

the vehicular load-induced stress is calculated by the numerical method firstly; then the plastic strain can be calculated by the proposed model. Finally

the plastic deformation is obtained by the layer summation method. The calculation example of the point NO.1 on Saga Airport access road is analyzed to illustrate the validitity of the model in a pratical boundary value problem.

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