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STRUCTURAL DAMAGE MODEL OF UNSATURATED EXPANSIVE SOIL AND ITS APPLICATION IN MULTI-FIELD COUPLE ANALYSIS ON EXPANSIVE SOIL SLOPE 总被引:1,自引:0,他引:1
Focused on the sensitivity to climate change and the special mechanical characteristics of undisturbed expansive soil, an elastc-plastic damage constitutive model was proposed based on the mechanics of unsaturated soil and the mechanics of damage. Undisturbed expansive soil was considered as a compound of non-damaged part and damaged part. The behavior of the non-damaged part was described using non-linear constitutive model of unsaturated soil. The property of the damaged part was described using a damage evolution equation and two yield surfaces, i.e., loading yield (LY) and shear yield (SY). Furthermore, a consolidation model for unsaturated undisturbed expansive soil was established and a FEM program named UESEPDC was designed. Numerical analysis on solid-liquid-gas tri-phases and multi-field couple problem was conducted for four stages and fields of stress, displacement, pore water pressure, pore air pressure, water content, suction, and the damage region as well as plastic region in an expansive soil slope were obtained. 相似文献
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夸克偶素双光子衰变的相对论效应 总被引:1,自引:0,他引:1
考虑到各种相对论效应,唯象地研究了0-+和0++夸克偶素的双光子衰变. 相比于通常用的非相对论近似,我们的相对论唯象方法给出了3种分别由介子内夸克相对动量,相对能量,以及它的自旋形式的选取带来的效应. 在cc和ss中我们做了具体的分析 相似文献
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The two-photon-exchange (TPE) correction to elastic ep scattering in the forward angle region is discussed based on a simple hadronic model. It is found that the correction is exactly zero in the forward angle limit. This analytical result gives a good explanation of the previous numerical results and shows the clear power behavior of the TPE correction to elastic ep scattering in the forward angle region. 相似文献
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非饱和膨胀土的结构损伤模型及其在土坡多场耦合分析中的应用 总被引:5,自引:0,他引:5
针对原状膨胀土对气候变化反映敏感的特点和其具有胀缩性、裂隙性、超固结性等力学特性,以非饱和土力学和损伤力学为基础,建立了一个非饱和膨胀土的弹塑性损伤本构模型及相应的固结模型.把原状膨胀土看成是由未损部分和损伤部分的复合体,未损部分用非饱和土的非线性本构关系描述,损伤部分用损伤演化方程和两个屈服面(即,加载屈服面和剪切屈服面)描述.其中的损伤演化方程包括加载引起的损伤和干湿循环引起的损伤两个方面,用作者研制的CT-三轴试验确定.设计了相应的有限元程序UESEPDC;对非饱和膨胀土边坡进行了三相多场耦合问题的数值分析.分析分为4个阶段,得到了边坡在每一分析阶段的应力场、位移场、孔隙水压力场、孔隙气压力场、含水量场、基质吸力场、结构损伤演化场和塑性区扩展的动态图,较好地揭示了膨胀土边坡在开挖和气候变化条件下逐渐发生失稳滑动的现象及其机理. 相似文献
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The results of two-boson-exchange effects in the parity-violating elastic electron-proton scattering are reported based on a simple hadronic model. The corrections are calculated including the nucleon and △(1232) intermediate states. And the numerical results are also compared with the recent results reported by other group and other methods. 相似文献
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The two two-photon exchange corrections to the unpolarized cross section and polarized observable PT, PL in elastic ep scattering are discussed in a simple hadronic model. Comparing with previous results, the △ contribution are re-analysed. And the similar corrections in e^+e^- → pp are also discussed. 相似文献
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The contributions of two-photon exchange in the process e+ + e-→ p + p including N and △ intermediate states are estimated in a simple hadronic model. The corrections to the unpolarized cross section as well as to the polarized observables Px and Px are evaluated. The results show the corrections to unpolarized cross section are small and the angle dependence becomes weak at small s after considering the N and △(1232) contributions simultaneously, while the correction to Px is enhanced. 相似文献
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