摘要
为提高乌审旗地区路基承载能力和稳定性,进行了多组三轴试验,对不同水泥掺和比及不同围压下改良土的应力—应变关系、静强度参数和刚度规律进行了研究.试验结果表明,水泥改良土较粉细砂原状土抗剪强度有不同程度的显著提升.水泥改良土的应力—应变曲线随轴向应变的增大,前期呈线性增长,后期增长斜率减小.随着围压与水泥掺和比的增加,水泥土体的强度与刚度均增加.随着水泥掺和比的增加,改良土的内摩擦角和粘聚力均增加,水泥掺量超过7%时其脆性表现较为明显,并基于试验分析了水泥改良土的水泥最佳配比.
In order to improve the bearing capacity and stability of the subgrade in the Wushenqi area,several sets of triaxial tests were carried out to study the stress-strain relationship,static strength parameters and stiffness of cement modified soils under different cement admixture ratios and different confining pressures.The experimental results show that the cement modified soil has more shear strength than the silty fine sand.The stress-strain curve of cement-modified soil increases linearly with the axial strain,and the slope of the later growth decreases.With the increase of confining pressure and cement mixing ratio,the strength and rigidity of cement modified soil increased.With the increase of the cement mixing ratio,the internal friction angle and cohesion of the modified soil increased,and the brittleness of the cement is more obvious when the cement modified content is more than 7%,and the optimum ratio of the cement was analyzed.
出处
《河北建筑工程学院学报》
CAS
2017年第4期24-28,40,共6页
Journal of Hebei Institute of Architecture and Civil Engineering
基金
河北省自然科学基金(NO.E2017404013)
河北建筑工程学院校科研基金项目(NO.B_201604)
河北建筑工程学院创新基金(XA201726)
关键词
水泥改良土
三轴试验
抗剪强度
掺和比
cement-modified soil
triaxial test
shear strength
blending ratio
