在粉土地基中采用微型桩基础具有较大的经济和社会效益。通过现场真型试验,对微型桩基础在下压荷载作用下的承力性状进行了研究,研究表明:对于本次试验,在下压极限荷载作用下承台底部土体承载比例≥6.9%,在进行微型桩基础承载力计算时可适当考虑承台底部土体承力。在此基础上,对微型桩基础的下压稳定计算方法进行了分析。 The use of micro-pile foundations in silty ground has great economic and social benefits. Through the field true type test, the bearing capacity of the micro-pile foundation under the action of downward pressure is studied. The results show that for this test, the bearing capacity of the soil under the pressure limit under load is ≥ 6.9% When calculating the bearing capacity of the micro-pile foundation, the bearing capacity of the soil at the bottom of the cap can be considered properly. On this basis, the method of calculating the stability of the push-down of the micro pile foundation is analyzed.