通过现场真型试验，对灌注细石混凝土微型桩的水平承载力进行研究，研究结果表明微型桩基础宜采用水平允许位移控制确定其水平设计承载力。结合试验结果，研究了微型桩单桩及群桩水平承载力的计算方法。选用合理的设计参数，可采用提供的设计方法进行微型桩基础水平承载力的初步设计。

The horizontal bearing capacity of fine rock concrete micropiles is studied by field test. It is shown that the horizontal design bearing capacity of micropile foundation should be calculated by horizontal allowable displacement. Based on the test results, the design method of the horizontal bearing capacity is investigated in single micropile and pile groups. If the design parameters are reasonably chosen, the horizontal bearing capacity of micropile foundation could be preliminarily designed by the provided method.