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毛竹是一种高强环保建筑材料,可以解决传统浅基坑支护成本高和后期临时结构的拆除费用等问题。开展竹管桩抗弯试验与单排微型竹桩模型试验研究,结果表明,压弯试验中随着竹桩自身净截面积的增加,其弹性模量逐渐减小,竹桩的弹性模量主要分布在8.0~12.5 GPa;模型试验中桩身应变随着埋深逐渐增加直至峰值,之后逐渐衰减为0,在到达0后出现反向应变,反向应变达到峰值后衰减为0。根据试验中桩身应变和桩顶侧移结果可知,浅基坑支护中使用单排微型竹桩能取得较好的支护效果。研究结果可为浅基坑竹桩支护作用机制和工程设计提供参考。
Bamboo is a kind of high-strength and environment-friendly building material, which can solve the problems of high support cost of traditional shallow foundation pit and dismantling of temporary structures in the later period. The bending test of bamboo tubular piles and the model test of single row miniature bamboo piles are carried out. The results show that with the increase of net cross-sectional area of bamboo piles, the elastic modulus of bamboo piles decreases gradually. The elastic modulus of bamboo piles is mainly The distribution of the strain increases from 8.0 GPa to 12.5 GPa. In the model test, the pile strain gradually increases to the peak value as the buried depth gradually decreases to zero, and reaches the zero value after the reverse strain occurs. The peak value of the reverse strain decreases to zero. According to the test results of pile strain and pile top displacement, it can be seen that single row micro-bamboo piles used in shallow foundation pit can achieve better supporting effect. The results can provide reference for the mechanism and engineering design of bamboo piles in shallow foundation pit.