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通过现场真型试验,对灌注细石混凝土成桩微型桩基础抗压承载机理及其抗压承载力计算方法进行了研究。试验表明:本次试验条件下,微型桩单桩可看成纯摩擦桩进行抗压承载力计算;微型桩群桩在极限下压荷载作用下,承台底部土体承担荷载比例仅为4.8%,在进行微型桩群桩抗压极限承载力计算时可不考虑承台底土的承载作用;由于承台对下压荷载的重分配,在下压荷载作用下,角桩承力最大,边桩次之,中桩最小;本次试验条件下,微型桩抗压群桩效应系数可取0.8进行计算。
Through the field true type test, the compressive bearing mechanism and the calculation method of the compressive bearing capacity of perfusion micropore pile foundation are studied. The test shows that under the conditions of this test, the micro pile single pile can be regarded as the pure friction pile to calculate the compressive bearing capacity; under the limit under the pressure load, the bearing capacity of the soil at the bottom of the pile cap is only 4.8% , The bearing capacity of the subsoil of the bearing platform can be ignored in the calculation of the ultimate compressive load of the mini pile group pile. Because of the redistribution of the subsidence load, , The minimum in the pile; under this test condition, the micro-pile compression pile group effect coefficient should be 0.8 to calculate.