(1 长安大学建筑工程学院， 西安 710061； 2 陕西省建筑设计研究院有限责任公司， 西安 710018)

［摘要］为了改善传统生土材料的力学性能和耐久性能，对掺加一定比例水泥、石灰、砂子、麦秸秆等掺料的干燥改性生土试块进行直接剪切试验，得到改性生土试块的破坏形态、破坏过程、剪应力-剪切位移关系曲线、抗剪强度与垂直压力的关系曲线以及受剪极限承载力；对比分析掺加不同改性材料以及同种材料不同比例对生土块材的强度和变形性能的影响规律，研究各种掺料对生土块材性能产生影响的机理；设计专门用于研究生土块材抗剪性能的推剪试验，探索能正确反映生土结构中土体抗剪性能的试验方法。

［关键词］改性掺料； 干生土块材； 抗剪性能； 直接剪切试验； 推剪试验

中图分类号：TU361文献标识码：A文章编号：1002-848X(2016)15-0106-04

Experimental study on shear properties of modified raw-soil bulks

Zhong Jiqing1， Wang Yihong1， Liu Qiji1， Yue Xingchao2

(1 School of Civil Engineering, Chang′an University，Xi′an 710061, China;2 Shaanxi Architectural Design and Research Institute Co., Ltd., Xi′an 710018, China)

Abstract:In order to improve the mechanical properties and durability of traditional raw-soil materials, the direct shear tests on dry modified raw-soil specimens adding cement, lime, sand and wheat straw in proportion were carried out. The failure mode, failure process, the curve of shear stress and shear displacement, the curve of shear strength and vertical pressure, and ultimate shear capacity of modified raw-soil specimens were obtained. The influence laws of different modified admixture or same admixture in different proportions on the strength and deformation performance of raw-soil bulk were compared and analyzed, meanwhile the influence mechanism of all admixtures on raw-soil bulk performance was studied. Push-shear test was designed specifically for studying shear properties of raw-soil bulk to explore an appropriate test methodology that can accurately reflect shearing properties of raw-soil structure.

Keywords:modification admixture; dry raw-soil bulk; shear property; direct shear test; push-shear test

*“十二五”国家科技支撑计划课题（2014BAL06B04）。

作者简介：仲继清，博士研究生，Email：275875497@qq.com。