本文从商业大厦下伏凝灰质砾岩风化壳的分带人手，提出大亚湾地区凝灰质砾岩风化壳分为三带，即强风化带、中风化带及微风化带。对各带承载力的确定分别采用重型（２）动力触探、回弹试验、点荷载试验及单轴抗压强度试验进行评价。其中对作为高层建筑物桩基持力层的微风化带进行了重点研究。为桩基设置在凝灰质砾岩风化壳上提出了一定的科学依据。 This paper points out that the weathering crust of the tuffaceous conglomerate in the Daya Bay area is divided into three zones, namely, strong weather zone, middle weather zone and micro weather zone. The determination of the bearing capacity of each belt was evaluated by heavy-duty (2) dynamic penetration testing, rebound testing, point load testing, and uniaxial compressive strength testing, respectively. Among them, a focus has been placed on the micro-weathering zone, which is the bearing layer of high-rise building piles. For the pile foundation set on weathering conglomerate weathering shell put forward some scientific basis.