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作者曾运用非线性有限元分析程序(NFAP)进行了履刺效应的计算分析,并得出了一些有意义的结果,然而,NFAP中的Druker-Prager模型与地面力学所涉及的表土力学模型相去甚远。在砂土和砂壤土试样的三轴试验的基础上,对于已在岩土工程中广为应用的Duncan模型进行了修正,修正是在等比加载条件下得出的应力-应变关系基础上进行的。分别给出了砂土、砂壤土在密实和松散状态下作为应力函数的切线弹性模量E_t的表达式,而切线泊松比v_t则根据E_t求出。在此基础上,编制出计算机程序(专用材料模型块),并装配于NFAP中,经过考题计算和初步应用结果的初步分析表明,这一扩充了的NFAP可为计算地面力学的沉陷和牵引力问题提供一个定量分析的工具。
The authors used non-linear finite element analysis program (NFAP) to calculate and analyze the stabbing effect and obtained some meaningful results. However, the Druker-Prager model in NFAP is different from the topsoil mechanics model involved in ground mechanics Far away. On the basis of triaxial tests of sand and sandy loam samples, the Duncan model, which has been widely used in geotechnical engineering, was modified, based on the stress-strain relationship obtained under isometric loading conditions ongoing. The expressions of tangential elastic modulus E_t of sandy soil and sandy loam as a function of stress in the dense and loose state are respectively given, while the tangential Poisson’s ratio v_t is obtained from E_t. Based on this, a computer program (special material model block) is compiled and assembled in NFAP. After preliminary calculation of test questions and preliminary application results, this extended NFAP can be used to calculate the subsidence and traction of ground mechanics Provide a quantitative analysis tool.