【摘要】 对900开口长钢管桩在打桩过程中对周围土体孔隙水压力的影响进行了跟踪测试。根据小孔扩张原理及弹塑性理论，对周围土体产生的水裂及弹塑性区范围进行了分析。结果认为：大口径开口钢管桩打桩过程中桩周一定范围内的土体产生裂缝，土体进入塑性状态，降低了土体有效应力。建议在桩基附近进行其它地下建筑物施工时，应采取适当措施。更多还原

【Abstract】 This paper analyses the matter of water cracks and the range of elasticoplasticity area around the soil based on the priciple of small pore dilation and the theory of elasticoplasticity, and also on the result of a tracking measurement on the influence of 900 opening steel tube piles while driven on pore water pressure ofsurrounding soil, It is concluded that when big aperture opening steel tube piles are being driven, the soil in a certain distance around the piles will crack, and the soil will come into plastic status, thus the effective stress of soil is reduced Therefore, It is suggested that some proper measures should be adopted, for the sake of programme’ s being accomplished successfully, when other subterranean buildings are constructed around the pile foundation.更多还原