下卧倾斜硬层对非均布荷载下地基沉降的影响

Influence of Inclined Bedrock on Subgrade Settlements under Non-uniformly Distributed Load

从沉降计算的弹性理论出发,结合有限元数值分析,以地基表面到下卧硬层的深度与基础宽度之比(深宽比)和下卧硬层倾斜角(假设硬层倾向在所取分析截面内)为变量,探讨了下卧倾斜硬层对非均布荷载下地基沉降的影响。以数值计算结果为根据,得到不同形式荷载作用下的沉降(差)影响系数,并绘出图表以辅助工程实际应用,同时就计算参数对沉降的影响、最大沉降点位置随深宽比和倾斜角的变化而偏移的现象进行了参数分析。最后,给出具体应用示例,验证了该方法的可行性.

Based on the elastic theory of settlement analysis, a finite element method was employed to investigate the influence of inclined bedrock on foundation settlements under non-uniformly distributed load in terms of two key variables： the depth-width ratio and the bedrock inclination. The first variable refers to the ratio between the depth from the compressible soil to the bedrock and the width of the foundation, while the second assumes the dip perpendicular to the direction of the strip foundation. According to the numerical results, the design charts of settlement influencing factors and differential settlement influ- encing factors under different load conditions were given to help practice application. Besides, parameter a- nalysis of the influence of calculating parameters on settlements and the position variation of the largest settlement with the change of the depth-width ratio and the bedrock inclination were given. Morover, a design example was presented to illustrate the use of the design charts.