【摘要】 结合工程试桩资料研究桩基施工工艺技术对桩基桩端效应的影响。提出钻孔桩的桩端效应与打入桩(挤土桩)不同,属于桩端减弱效应,即桩端附近土层的摩阻力会明显降低,并随着离开桩端距离的增加而逐渐减弱,同时引入附加泥皮的概念来解释钻孔桩的桩端效应产生的机理,最后提出了改善钻孔桩桩端效应的有效措施—桩端后压浆技术。更多还原

【Abstract】 Based on the test data of bored and driven piles the effect of construction technology on the end effect of pile is studied.The end effect of driven pile(displacement pile) is different from that of bored pile and for the end effect of bored pile the skin friction in the soil layer adjacent to the pile end is redncing.The degradation degree of skin friction is reduced with the increase of the distance from pile end.The concept of additional mud cake is introduced to explain the mechanism of end effect of the bored pile.The test results of post-grouting piles indicate that the post-grouting technique is an effective means to improve the end effect of bored pile.更多还原