竖向条形锚定板水平拉拔极限承载力统一理论解研究

针对竖向条形锚板拉拔问题的研究存在人为区分浅埋、深埋,且界定标准及力学模型的对称性认识不统一,基于自主研制的条形锚水平拉拔可视化模型试验和数值模拟试验,研究拉拔过程中板前土体的位移变形规律。极限状态下,板前存在弹性核三角形区域,其角度变化可反映板前滑移线场的对称性;随着埋深比的增大,三角形弹性核的上角增大（φ-π/4＋φ/2）,上侧土体位移变形范围相对缩小,从延伸至地表收缩至板前附近;下角减小（π/2-π/4＋φ/2）,下侧土体位移变形范围则相对扩大,边界与竖向夹角在π/2-3π/4＋φ/2间变化;上下角之和基本保持不变（φ＋π/2）,板前滑移线场由非对称逐步向对称发展。在此基础上,提出相应的假定,构建可考虑埋深等因素变化的竖向条形锚定板的水平拉拔极限承载力学模型,并推导出极限承载力的统一理论解。计算结果表明：新的力学模型很好地反映了板前滑移线场的对称性随埋深比的连续变化规律,无需再人为区分浅埋和深埋;极限承载力统一理论解对砂土中竖向条形锚定板具有很好的适用性,计算结果与试验值符合的更好,较其它3种传统方法具有明显优势。

砂土中水平条形锚板竖向拉拔承载力统一计算方法研究

水平锚板竖向拉拔承载机理与承载力计算方法的研究目前存在人为区分浅埋、深埋,但界定标准又极不统一的问题。该文通过总结水平条形锚板竖向拉拔承载机理,提出了可描述极限拉拔下锚周土体滑动面随埋深比连续演化的对数螺旋线形态函数,建立了无需区分浅埋、深埋的极限承载统一力学模型。根据锚板埋深、滑动面交点与锚板距离和滑动面上切线为竖直线时对应点到锚板距离三者的大小关系,分3种情况开展极限平衡分析,推导出水平条形锚板竖向拉拔极限承载力计算统一理论解。结果表明:新的力学模型很好地反映了锚周土体滑动面随埋深比的连续变化规律,无需再人为区分浅埋和深埋。应用9种方法对5个试验案例(松砂、密砂)进行对比计算分析,统一理论解法排名第2,显示出具有较强的适应性。

Inflation Scheme Derived from Universal Wave Function Interpretation of String Theory

Inflation is the most commonly accepted theory in cosmology to explain why the universe appears flat, homogeneous, and isotropic, as well as the origin of the large-scale structure of the cosmos and why no magnetic monopoles have been detected. However, so far, the origin of the inflation epoch and what is the hypothetical field, the inflation, giving rise to inflation, remains unknown. String theory is one of the promising candidates for the grand unification theory. Grand unification theory is to use one mathematic formula to describe everything. In this work, we study the inflation scheme in a new development in string theory, UWFIST （universal wave function interpretation of string theory）. We show that from UWFIST we can derive from the fundamental theory that the long-range vibration is the possible candidate of inflation. We estimate the vacuum energy created by the long-range vibration and show that it can indeed drive the inflation.