大亚湾凝灰质砾岩风化壳分带及其承载力评价方法探讨──以大亚湾商业大厦基桩工程勘察为例

DISCUSSION ON WEATHERING ZONATION OF TUFFACEOUS CONGLOMERATE AND EVALUATION METHOD OF IHEIR BEARINGCAPACITY IN DAYA BAY,GUANGDONG PROVINCE一Exampled by investigation of foundation pile engineering of Daya Bay commercialbuilding

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。

Theweathering mantle of tuffaceous conglomerate in Daya Bay area is divided intothree zones：violently weathered zone，medium weathered zone and slighty weateredzone，Their bearing capacity is decided by heavy－duty dynamic sounding，echo sounding，point load test and single axial compressive strength test． Especially，the bearing capacityof the slightly weathered zone is studied．This is a scientific basis for laying foundationpiles on the weathered zone of tuffaceous conglomerate。