宁海部分地区砂卵石模量与承载特性研究  

Modulus parameters and bearing characteristics of sandy cobble in Ninghai area

作　　者：卞士海 蔡国成 蒋建良 周顺刚 常金源 Bian Shihai;Cai Guocheng;Jiang Jianliang;Zhou Shungang;Chang Jinyuan(Zhejiang Engineering Survey and Design Institute Group Co.,Ltd.,Ningbo 315012,China;Key Laboratory of Safe Construction and Intelligent Maintenance for Urban Shield Tunnels of Zhejiang Province,Hangzhou 310015,China)

机构地区：[1]浙江省工程勘察设计院集团有限公司,浙江宁波315012 [2]浙江省城市盾构隧道安全建造与智能养护重点实验室,杭州310015

出　　处：《工程勘察》2025年第3期16-21,共6页Geotechnical Investigation & Surveying

基　　金：水利部水库大安全重点实验室开放基金(YK321011).

摘　　要：宁海地区分布了较多的砂卵石,由于砂卵石工程特性与常规土体差异较大,难以获得有效的设计参数。为进一步了解砂卵石模量和承载特性,本文针对宁海地区砂卵石开展了平板载荷试验、重型动力触探以及波速测试,探索了模量与承载力、重型动力触探击数以及波速之间的关系。试验结果表明宁海地区的砂卵石变形模量变化范围为30~300MPa;承载力特征值范围为1140~2600kPa,远大于设计规范建议的400kPa特征值;重型动力触探击数变化较大,变化范围为6~24击。单个试验区域的砂卵石变形模量与重型动力触探击数大致呈线性关系,大区域范围内的砂卵石变形模量与重型动力触探击数不存在线性关系。波速测试方法应用于砂卵石地层效果不理想,预估地基承载力可能并不合适。这些可以为工程人员参数选择指导,有利于深入了解砂卵石土的力学特性。Sandy cobble are widely distributed in the Ninghai area,and due to significant differences in mechanical properties between sandy cobble and general soil,it is difficult to obtain effective design parameters.In order to further understand the modulus and bearing characteristics of sandy cobble,plate load tests,heavy dynamic penetration tests,and wave velocity tests are conducted to investigate the relationship between modulus and bearing capacity,heavy dynamic penetration blows,and wave velocity.The test results show that the deformation modulus of sandy cobble varies from 30 to 300MPa,and the characteristic value of bearing capacity ranges from 1140 to 2600kPa,which is much greater than the recommended characteristic value of 400kPa in the design specifications.The blow number of heavy dynamic penetration tests varies greatly,ranging from 6 to 24.The deformation modulus of sandy cobble in one experimental site is roughly linearly related to the blow number of heavy dynamic penetration tests.However,the linear relationship is not feasible for the whole area.The application of wave velocity testing method in sandy pebble is not ideal,and estimating the bearing capacity of the foundation may not be appropriate.These can provide guidance for engineering personnel in parameter determination,which is beneficial to understand the mechanical properties of sandy cobble soil.

关 键 词：砂卵石 模量参数 承载力 平板载荷试验 重型动力触探 波速测试 

分 类 号：TU471[建筑科学—结构工程]