不均质体对水泥土强度特性的影响规律试验研究.pdfVIP

第14卷　 第4期 南京工程学院学报(自然科学版) Vol.14,No.4 2016年12 月 Journal of Nanjing Institute of Technology(Natural Science Edition) Dec. ,2016 　 　 doi:10.13960/ j.issn.1672-2558.2016.04.005 投稿网址:http:/ / 不均质体对水泥土强度特性的影响规律试验研究 1 2 2 彭　 涛 ,曹智国 ,章定文 (1. 苏交科集团股份有限公司,江苏 南京210017;2. 东南大学交通学院,江苏 南京210096) 摘　 要:为了评价不均质体对水泥土材料力学性能的影响,室内在搅拌均匀的水泥土中填入球形的软黏土块作为 不均质体,养护28 d后进行无侧限抗压强度试验,分析不均质体的体积百分比和尺寸等对强度特性的影响规律.试 验结果表明,不均质体的存在会使水泥土试样的无侧限抗压强度和变形模量显著降低,1%的不均质体会导致7 % 的强度折减,8 %的不均质体可使水泥土试样的强度折减率达65．6 %.不均质体的总体积百分比一定时,水泥土试 样的强度随着不均质体尺寸的减小而增大.均质的或不均质体较小的水泥土材料,其破坏模式为整体张裂破坏或 整体剪切破坏;不均质体较大的水泥土材料,其破坏模式表现为局部破碎.水泥土搅拌桩的实际设计应考虑水泥土 材料的非均质性. 关键词:水泥土;不均质体;无侧限抗压强度;变形模量;破坏模式 中图分类号:TU472 An Experimental Study on the Effect of Inclusions on Cement-Soil Admixtures 1 2 2 PENGTao , CAOZhi-guo , ZHANG Ding-wen (1. JSTI GROUP, Nanjing210017, China; 2. School of Transportation, Southeast University, Nanjing210096, China) Abstract:To assess effects of heterogeneity on performance of soil-cement admixture, globate soft clay blockswere put to evenly stirred cement soils, functioning as heterogeneity. It was maintained for 28 days and then tested for unconfined compressive strength in an effort to study the impacts of its volume percentage and size on the strength performance. The test results show that therewas a significant increase in unconfined compressive strength and deformation modulus of the samples because of heterogeneity. More specifically, unconfined compressive strengthwasreducedby7 % dueto 1% of heterogeneity, and the strength of cement-soil sampleswas reduced by65．6 % by 1% of heterogeneity.