（1 西南科技大学土木工程与建筑学院， 绵阳 621010； 2 四川鼎盛地矿岩土工程勘察有限公司， 绵阳 621010； 3 中交公路岩土工程有限公司， 西安 710075）

［摘要］传统夯土墙具有就地取材，制作技术简单，造价低廉，以及无可比拟的可再生环保性等优越性能；但存在抗压强度低，容易出现裂缝等缺点。为改善传统夯土墙的受力性能的不足，提出了在夯土中加入聚丙烯纤维、碎石和土工格栅的复合改性方案。为验证该改性方案的合理性，以及寻求上述掺料的最优掺量，进行了系列改性夯土试样的抗压性能试验。试验结果表明，在夯土中加入合适掺量的聚丙烯纤维、碎石和土工格栅，可以有效地提高夯土的抗压、抗裂性能；其中又以加入1%（质量比）聚丙烯纤维、5%（质量比）不同粒径碎石组合（粒径小于5mm碎石、10mm碎石和15mm碎石质量比为1：1：1）和土工格栅的夯土改性方案最优。该改性方案可有效提高夯土墙体的抗压承载力和抗裂性能。

［关键词］夯土； 聚丙烯纤维； 碎石； 土工格栅； 抗压试验

中图分类号：TU313文献标识码：A文章编号：1002-848X(2018)14-0108-05

Compression test study on modification rammed earth with polypropylene fiber, gravel and geogrid

Liu Degui1, Xu Yonghuai2 , Wang Ning1, Li Yuanhao3, Lei Jingsong1, Wang Ruheng1

(1 School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang 621010,China; 2 Sichuan Dingsheng Geological and Mining Geotechnical Engineering Investigation Co.,  Ltd.,  Mianyang 621010,China; 3 China Highway Geotechnical Engineering Co.,  Ltd.,  Xi′an 710075,China)

Abstract:The traditional rammed earth wall has the superior performance of easily obtained local raw materials, simple fabricated process, low cost, environmental protection and renewability, ect. But it also has the disadvantages of low compressive strength, easy to crack and so on. In order to improve the disadvantages in mechanical properties of rammed earth wall, the composite modification scheme was put forward to add polypropylene fiber, gravel and geogrid into rammed earth. To validate the feasibility of the modified method and obtain the optimal dosage of admixture, a series of compression tests were done for modified rammed earth specimens. The test results show that adding moderate dosage of polypropylene fiber, gravel and geogrid can effectively improve the compressive strength and crack resistance of rammed earth; and the rammed earth with adding 1% (mass ratio) polypropylene fiber, 5% different particle size grave combinations (mass ratio) (grain size< 5mm,10mm and 15mm gravels with mass ratio of 1∶1∶1) and geogrid is the optimal scheme. The composite modification scheme could improve the bearing capacity and crack resistance capability of the rammed earth wall.

Keywords:rammed earth; polypropylene fiber; gravel; geogrid; compression test

*“863”计划重点项目（2015BAL03B03-05）。

作者简介：刘德贵，博士，讲师，Email:shll830520@163.com。