摘要
基于Deng等关于井阻随深度线性增大和随时间指数增大的假设,推导了这一假设条件下满足等应变径向固结基本方程及一切求解条件的竖井地基固结解析解。通过与现有常井阻固结解析解对比,验证了本文解的正确性。利用本文解析解,计算对比了不同井阻变化率(即参数A2和A3值)的平均孔压和平均固结度,分析了不同时间因子、深度条件下,井阻随深度和时间的变化对竖井地基固结特性的影响。结果表明:井阻随深度和时间增大将使竖井地基固结速率减小,甚至使竖井加速地基固结的能力逐渐消失。
A new rigorous analytical solution is deduced from the equivalent strain governing equation for the consolidation by vertical drains on the basis of the assumption proposed by Deng et al(2013), that is, the well resistance increasing linearly with depth and exponentially with time. The solution is verified through the comparison with the results got from the existing analytical solution, in which the well resistance remains constant. Based on the new solution, the average excess pore water pressure and average degree of consolidation are compared with different rates of change of the well resistance(described by coefficient A2 and A3), and the influences of the depth and time-dependent well resistance on the rate of the consolidation by vertical drains are analyzed. It shows that the increase of the well resistance with depth and time will slow down the rate of the consolidation, and even make the ability of accelerating consolidation of vertical drains lose gradually.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2015年第6期996-1001,共6页
Chinese Journal of Geotechnical Engineering
基金
国家自然科学基金项目(51179170,51278453,51308309)
关键词
竖井地基
解析解
井阻
固结
vertical drain
analytical solution
well resistance
consolidation
