基于力学性能指标与耐久性能指标联合的夯土改性配比优化设计方法  

Design method for optimum mix proportion of modified rammed earth based on combination of mechanical and durability performance indexes

作　　者：沈圣[1] 孙宇 王耀 姜绍飞[1] 张鹰[1] 付绪峰 王鸣 Shen Sheng;Sun Yu;Wang Yao;Jiang Shaofei;Zhang Ying;Fu Xufeng;Wang Ming(Fuzhou University,Fuzhou 350108,China;Shanghai Construction Decoration Engineering Group Co.,Ltd.,Shanghai 200040,China;CSCEC Strait Construction and Development Co.,Ltd.,Fuzhou 350015,China)

机构地区：[1]福州大学,福建福州3501082 [2]上海市建筑装饰工程集团有限公司,上海2000403 [3]中建海峡建设发展有限公司,福建福州350015

出　　处：《土木工程学报》2024年第5期1-14,共14页China Civil Engineering Journal

基　　金：国家重点研发计划(2020YFD1100403);国家自然科学基金(52278295);福建省住房和城乡建设行业科学技术计划项目(2022-K-36);中建海峡科技计划项目(ZJHX2021D010)。

摘　　要：素土强度低、耐久性差且各改性材料掺量往往由工匠凭经验大致确定,导致夯土表面时常容易开裂剥落,故应根据现场土质状况以及合理试验方法来设计夯土改性配比。现有研究大都局限于单一性能指标最优的配比,而现实中夯土既要考虑针对多项力学性能指标与耐久性能指标的同步优化,还要考虑不同地域与气候条件下各指标的重要性不同。另外,现有研究仅能确定若干预设配比中的最优组,而非改性材料预设掺量范围内的最优配比。为此,文章提出一种基于力学性能指标与耐久性能指标联合的夯土改性配比优化设计方法,其包括:(1)土料选用原则与土质鉴定方法;(2)考虑夯土多性能指标的综合赋权方法;(3)基于加权评分和回归分析的夯土改性配比综合比选与优化方法。文章方法通过调整指标权重筛选出适应指标重要性不同时的夯土改性配比,并通过优化设计获得各改性材料预设掺量范围内的最优配比。最后通过设计实例证明了文章方法的确可得到最优的夯土改性配比。Due to the low strength and poor durability of plain soil,and the roughlyestimated proportion of modified materials determined from craftsman's experience,the surface of rammed earth(RE)is always susceptible to cracking and spalling.Hence,the mix proportion of modified RE(MRE)shall be designed based on the parameters of actual soil and reasonable testing method.Most existing studies are limited to obtaining a single performance index-based optimum mix proportion of MRE.However,the mix proportion of actual MRE shall be optimized by synchronously considering multiple mechanical and durability indexes,and meanwhile the relative importance of variables in different regions and climatic conditions shall be evaluated.Furthermore,in the existing researches,only the optimum group is determined from several predefined mix proportions,which is different from the optimum mix proportion within the preset content range of the modified material.In this work,a design method of determining the optimum mix proportion of MRE is proposed by combining the mechanical and durability performance indexes.The design method includes 1)selection principles of earth material and identification method of soil properties;2)a multi-indexes-based comprehensive weighting method of MRE;3)comparison and optimization of the mix proportion of modified MRE based on weighted score and regression analysis.The proposed method screens out the appropriate mix proportion of MRE by adjusting the index weight according to the varying importance of indexes.Through the optimized design,the optimum mix proportion of each modified material within the preset content range can be acquired.Based on the designed example,it is validated that the optimum mix proportion of MRE can indeed be determined by the proposed method.

关 键 词：夯土 配比 多性能指标 权重系数 优化设计 

分 类 号：TU361[建筑科学—结构工程]