饱和黏土水土压力合算的计算公式

发布时间：2018-04-19 09:15

本文选题：水土压力分算 + 水土压力合算　；参考：《岩土力学》2017年06期

【摘要】：由于水、土压力合算法存在一定的争议,首先对国内现行水、土压力合算公式在完全不排水条件和稳定渗流情况下计算正常固结黏土水、土压力的误差进行了定量的分析,发现计算结果在大多数情况下偏危险,误差可超过40%;然后根据等效原则,推导出了饱和正常固结黏土和超固结黏土的水、土合算公式,得到的公式与文献[2]建议的公式一致,同时证明了该公式与国外采用固结不排水抗剪强度的水、土压力合算公式也一致;对于正常固结和轻微超固结饱和黏土,由等效原则得到的水、土压力合算公式高估存在渗流时主动极限平衡状态水、土压力的合力,而对于重度超固结饱和黏土,水、土压力合算可能低估存在渗流时主动极限平衡状态水土压力的合力,最危险的状态是负超静孔压完全消散时。水、土压力合算公式是采用总应力指标计算在假定完全不排水条件下饱和黏土进入主动或被动极限平衡状态时的水、土总压力,公式并不能考虑渗流对水、土压力的影响,而渗流对水、土压力的影响显著,在实际工程中应加以考虑。
[Abstract]:Due to the controversy of water and earth pressure matching algorithm, the error of calculation of normal consolidation clay water and earth pressure under the condition of complete undrainage and steady seepage is analyzed quantitatively in the present water and earth pressure formula in our country.It is found that the calculation results are dangerous in most cases, and the error can exceed 40. Then, according to the principle of equivalence, the formula of water and soil value for saturated normal consolidated clay and overconsolidated clay is derived, and the formula is in agreement with the formula suggested in reference [2].At the same time, it is proved that the formula is in agreement with the formula of earth pressure, which is obtained from the principle of equivalence for normal consolidation and slightly overconsolidated saturated clay.The earth pressure formula overestimates the resultant force of the active limit equilibrium state water and earth pressure in the presence of seepage, but for heavy overconsolidated saturated clay, water and earth pressure may underestimate the resultant force of the active limit equilibrium state soil and water pressure in the presence of seepage.The most dangerous state is when the negative excess pore pressure dissipates completely.The formula for calculating water and earth pressure is to use the total stress index to calculate the influence of seepage on water and earth pressure when saturated clay enters the state of active or passive limit equilibrium under the assumption of completely undrained condition.Seepage has a significant effect on water and earth pressure, which should be considered in practical engineering.
【作者单位】：深圳大学土木工程学院;
【基金】：国家自然科学基金资助项目(No.51478273) 深圳市基础研究项目(No.JCYJ20140418095735556)~~
【分类号】：TU442

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