为研究深基坑被动区阶梯式加固尺寸对桩位移的影响,在提出被动区阶梯式加固概念的基础上,以某大楼基坑工程为背景,以现场试验数据为基础,针对加固形状及阶梯式加固尺寸等对桩位移的影响因素,建立数值模型并进行模拟。结果表明:数值模拟可以较好地分析桩支护体系的实际变形规律;被动区加固对支护桩位移影响是非常显著的;阶梯型加固尺寸存在最优参数比,即当各阶加固宽度与深度相当时,加固效果最理想;被动区阶梯式加固相比其他加固形式有明显的优势,具有较强的适用性。
Abstract
To research the influence of stepped reinforcement size on pile displacement in the passive zone of deep foundation pit, we presented the concept of stepped reinforcement. On the basis of field test data of a foundation pit, we established a numerical model in which factors affecting the pile displacement such as the reinforcement shape and size are taken into consideration. Results showed that the simulation could well reflect the actual deformation of pile support system. The reinforcement in the passive zone has significant impact on the pile displacement. The optimum reinforcement effect can be obtained when the reinforcement width and depth at each step are approximately equal. Compared with other reinforcement approaches, the stepped reinforcement has obvious advantage, and is also highly feasible.
关键词
基坑 /
软土地基 /
阶梯式 /
被动区 /
位移影响 /
数值模拟
Key words
foundation pit /
soft soil ground /
stepped /
passive zone /
lateral deformation /
numerical simulation
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参考文献
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