粉煤灰回填双层结构地基建筑极限承载力计算  

Calculation of Ultimate Bearing Capacity of Double-Layer Structure Foundation Building Backfilled with Fly Ash

作　　者：胡庭婷 HU Tingting(Chong Qing Light Industry School,Chongqing 400709,China)

机构地区：[1]重庆市轻工业学校,重庆400709

出　　处：《粉煤灰综合利用》2024年第6期54-58,共5页Fly Ash Comprehensive Utilization

基　　金：重庆市自然科学基金创新群体科学基金(cstc2022jcyj-cxttX0004)。

摘　　要：为了提高粉煤灰回填地基极限承载力计算精度,提出一种粉煤灰回填双层结构地基建筑极限承载力计算方法。采用强夯方法构建一个由上层硬壳层、下层软弱层组成的双层地基结构,并对其受力情况进行分析;计算不同埋深的基础地基承载力系数,并根据承载力系数确定软弱下层整体剪切破坏承载力、上层地基硬壳层冲剪破坏承载力以及地基土与地基侧壁下沉摩擦力。结果表明:地基埋深和宽度比值大于等于4时,地基极限承载力曲线变化趋于平稳;当地基埋深为1.2 m,主应力系数为0.5时地基承载力为5.0 MPa,主应力系数为1时地基承载力为5.5 MPa;在相同主应力系数下会随着地基基础埋深的增长而增加。上述结果表明该评价结果能够为上层建筑物稳定性能提供数据支撑。In order to improve the accuracy of calculating the ultimate bearing capacity of fly ash backfilled foundation,this paper proposes a method for calculating the ultimate bearing capacity of double-layer structure foundation buildings with fly ash backfill.Construct a double-layer foundation structure consisting of an upper hard shell layer and a lower weak layer using dynamic compaction method,and analyze its stress situation;Calculate the bearing capacity coefficient of the foundation at different burial depths,and determine the overall shear failure bearing capacity of the weak lower layer,the impact shear failure bearing capacity of the hard shell layer of the upper foundation,and the settlement friction force between the foundation soil and the foundation sidewall based on the bearing capacity coefficient.The results show that when the ratio of foundation depth to width is greater than or equal to 4,the variation of the ultimate bearing capacity curve of the foundation tends to be stable;The local foundation has a burial depth of 1.2 meters.When the principal stress coefficient is 0.5,the bearing capacity of the foundation is 5.0 MPa,and when the principal stress coefficient is 1,the bearing capacity of the foundation is 5.5 MPa;Under the same principal stress coefficient,it will increase with the increase of the burial depth of the foundation.The above results indicate that the evaluation results can provide data support for the stability performance of upper level buildings.

关 键 词：粉煤灰回填地基 地基承载力 地基回填 强夯处理 应力系数 极限承载力 

分 类 号：TU473[建筑科学—结构工程]