透水性桩处治输电塔不均匀沉降的适用性研究

Research on the applicability of permeable concrete piles to treat uneven settlement of power transmission towers

透水性混凝土桩具有高强度和强透水性,应用在黄河冲积平原区,能够有效加速土体固结,减少不均匀沉降。依托实际工程,应用有限差分软件建立输电铁塔地基模型,进行数值模拟分析,研究垂直荷载作用下超孔隙水压力、竖向位移的变化规律。结果表明:在饱和状态下,透水性混凝土桩复合地基承载力约为不设桩地基承载力的2倍;透水性混凝土桩复合地基超孔隙水压力消散速率先快后慢。桩长不变,随着桩间距增大,超孔隙水压力消散速率变慢,复合地基最大沉降量变大;保持桩间距不变,超孔隙水压力消散速率随着桩长增加而变快,复合地基最大沉降量变小。研究结果为黄河冲击平原区透水性混凝土桩处治输电铁塔不均匀沉降问题提供了理论依据。

Permeable concrete piles with high strength and strong water permeability can effectively accelerate soil consolidation and reduce uneven settlement when applied in the Yellow River alluvial plain area.Base on the article,through practical engineering,finite difference software is applied to establish the transmission tower foundation model,and numerical simulation analysis is carried out to study the changes of super pore water pressure and vertical displacement under vertical load by changing the permeable concrete pile length and pile spacing respectively.The results show that the bearing capacity of the composite foundation of permeable concrete pile is about twice of that of the foundation without pile in the saturated condition;the rate of dissipation of super pore water pressure of the composite foundation of permeable concrete pile is fast and then slow.The pile length remains unchanged,as the pile spacing increases,the dissipation rate of super pore water pressure becomes slower and the maximum settlement of the composite foundation becomes larger;keeping the pile spacing unchanged,the dissipation rate of super pore water pressure becomes faster as the pile length increases and the maximum settlement of the composite foundation becomes smaller.The results of the study provide a theoretical basis for the treatment of uneven settlement of transmission towers by permeable concrete piles in the impact plain area of the Yellow River.