摘要
为了研究充分调动土工合成材料达到筋土界面剪应力峰值所需的拉拔位移值、填料在拉拔过程中位移和应力的变化以及筋材拉应力的分布在拉拔过程中的变化,在3种土工合成材料室内拉拔试验的基础上,建立了FLAC3D数值模拟分析模型。研究结果表明,FLAC3D数值模拟分析模型得出的拉拔剪应力与位移曲线与拉拔试验结果基本一致;筋材拉应力随着拉拔位移的增加整体呈增大的趋势,当达到拉拔剪应力峰值时,筋材拉应力趋于稳定;填料在拉拔方向上的位移包括正位移区、负位移区和零位移区,正位移区的边界代表了筋材上下影响带的高度;填料在拉拔方向的应力随着拉拔位移的增大从下往上分层递减分布变成围绕土体前后2个最大、最小应力圈分别向四周递减、递增分布。
On the basis of three kinds of geosynthetics pullout tests, the established FLAC3D numerical simulation model studied the required pull-out displacement value by fully mobilizing geosynthetics to arrive at the peak of shear stress and the changes of draw- ing displacement and stress for reinforced soil＆ The results show that the model of FLAC3D numerical simulation and analysis are basically consistent with the pullout test as for the curve about shear stress and drawing displacement. The tensile stress of the rein- forcement increases with the increase of the pulling force, and when the peak value of the shear stress is reached, the drawing stress of the reinforcement tends to be stable. The dis- placement of the filler in the drawing direction includes the positive displacement, the negative displacement and the zero displacement. The boundary of the positive displacement represents the height of the influence belt. The stress in the drawing direction of filler changes from descending distribution layer by layer from the lower to the upper into decreasing and increasing distribution around the two maximum and minimum stress circle along with the increase of the drawing displacement.
出处
《长沙理工大学学报（自然科学版）》
CAS
2016年第4期8-14,共7页
Journal of Changsha University of Science and Technology:Natural Science
关键词
土工合成材料
拉拔试验
数值模拟分析
拉拔位移
影响带高度
geotechnical synthetic material
drawing test
numerical simulation analysis
drawing displacement
the height of influence belt
