浙东分布的砂砾岩,埋深较浅,胶结较差,钻探岩芯呈砂卵砾石散粒状,勘察易将其误认为砂砾石层或全风化基岩层,工程承载力取值往往偏低。结合该区部分工程勘察项目实践,就该区泥质弱胶结砂砾岩的特性及桩基承载力参数进行总结和分析。分析认为浙东地区弱胶结砂砾岩为软岩,岩芯碎散,胶结较差,但原岩强度较高。中等风化层,虽埋深较浅,承载力仍然较大,可以做为浅层基础持力层。对于荷载较大或变形要求较高的工程建筑(如超高层建筑)可采用后注浆或人工挖孔扩底桩等工艺。该地区施工工艺改进后,旋挖钻机成孔效率较高。 Gritstone distributed in east Zhejiang has shallow depth and poor cementation. Sandstone, gravel and granite are scattered in the drilling core. It is easy to reconstruct it as sand gravel or fully weathered base rock. The engineering bearing capacity is often low. Combined with the practice of some engineering exploration projects in this area, the characteristics of the weakly cemented gluten conglomerate and the parameters of pile bearing capacity are summarized and analyzed. Analysis shows that the weakly cemented glutenous conglomerate in eastern Zhejiang is soft rock, the core is fragmented and cementation is poor, but the original rock strength is higher. Medium weathered layer, although shallow depth, bearing capacity is still large, can be used as a shallow foundation bearing layer. For large loads or high deformation of the engineering construction (such as super high-rise buildings) can be used after the grouting or manual digging holes to expand the pile and other technology. After the improvement of the construction technology in the area, the rotary drilling rig has a higher hole forming efficiency.