吊脚桩下部软岩层边坡加固及稳定性分析

Analysis of stability and reinforcement of suspending pile at the lower part of the soft rock slope

对于岩面高于基底的基坑,可采用桩端仅嵌入稳定的中、微风化岩层的吊脚桩围护形式。当吊脚桩下部为软弱破碎岩土层,下部边坡开挖将影响基坑稳定。本文结合现场情况对桩端下部软弱边坡进行加固处理,并采用现场监控量测与有限元数值模拟相结合的方法,对边坡开挖过程中的变形及稳定性进行研究。通过将计算结果与现场实测数据比较,得出边坡处于安全的工作状态。

In the practical engineering, under the condition that the design base of foundation is beneath Fri stratum, the suspending piles are widely adopted and the pile endings can be embedded in the intermediary and/or weak weathered strata. While if the pile ending is surrounding by weak and broken stratum, the excavation of lower part of slope might affect its stability. Based on the practical reinforcement treatment on weak stratum around the bottom of pier, field monitoring method combined with finite element method were performed as a basis to the analysis for deformation characteristics and stability during its excavation. Through the comparison of simulated results and actual monitoring data, it resulted that the slope is exhibiting stable performance.