某弱胶结含砾砂岩地基承载力取值探讨  

Discussion on Bearing Capacity Values for Weakly Cemented Gravel Sandstone Foundation

作　　者：李守明 张鑫全 王猛 曾洪贤[1] Li Shouming;Zhang Xinquan;Wang Meng;Zeng Hongxian(China Railway Major Bridge Reconnaissance&Design Institute Co.,Ltd.)

机构地区：[1]中铁大桥勘测设计院集团有限公司,武汉市430000

出　　处：《勘察科学技术》2024年第3期40-43,共4页Site Investigation Science and Technology

摘　　要：该文通过对龙潭长江大桥北锚碇基础的勘察,针对该桥基底普遍分布的第三系半成岩层中的弱胶结含砾砂岩,分析了规范中对半成岩地层地基承载力取值的局限性。基于现场原位试验及现有理论和经验,综合对比了多种方法确定的地基承载力结果。归纳了第三系半成岩地基承载力的综合取值方法,对规范中其取值提出了经验补充方法,即对半成岩地基承载力特征值可按中密角砾的范围提高10%或按密实砾砂进行取值。This paper analyzes and explains the limitations of the standard values for the bearing capacity of the foundation of the northern anchorage of the Longtan Yangtze River Bridge,focusing on the weakly cemented gravel bearing sandstone in the widely distributed tertiary semi diagenetic strata.Based on in-situ tests and existing theories and experiences,a comprehensive comparative study is conducted to determine the bearing capacity of the foundation using various methods.It summarizes the comprehensive value method for the bearing capacity of the tertiary semi rock foundation,and provides empirical supplements to its value in the specifications.Specifically,the characteristic value of the bearing capacity of semi rock foundation can be increased by 10% according to the range of medium dense angular gravel or recommended according to dense gravelly sand.

关 键 词：半成岩 地基承载力 锚碇 深层平板载荷试验 

分 类 号：U443.1[建筑科学—桥梁与隧道工程]