地裂缝带Q_3黄土强度与流变长期强度关系研究  

Study on the Relationship Between the Shear Strength and the Long-term Rheological Strength of the Q_3 Loess in the Fissure Zone

作　　者：李丽 邓亚虹[2,3,4] 王鹏[5] 慕焕东[2,3] 李飞霞[2] 

机构地区：[1]甘肃省交通科学研究院有限公司,兰州730050 [2]长安大学地质工程与测绘学院,西安710054 [3]长安大学西部矿产资源与地质工程教育部重点实验室,西安710054 [4]长安大学国土资源部岩土工程开放研究实验室,西安710054 [5]甘肃省地矿局第三地质矿产勘查院,兰州730050

出　　处：《地下空间与工程学报》2018年第1期241-249,共9页Chinese Journal of Underground Space and Engineering

基　　金：国家自然科学基金(41002106;41372327);甘肃省交通运输厅科技项目(2012-03)

摘　　要：西安地区是我国地裂缝最为发育,灾害最为严重的地区,随着城市建设的不断发展,尤其是地铁工程的陆续进行,地裂缝灾害成为工程建设的制约因素。考虑到地裂缝灾害的严重性,通过对西安地区长安地裂缝带Q_3原状黄土进行了不同围压下的固结不排水(CU)常规三轴试验,在试验基础上,分析了地裂缝带Q_3原状黄土的应力-应变关系及试样破坏类型,建立了地裂缝带Q_3原状黄土的应力-应变关系模型,获得了地裂缝带Q_3原状黄土不同应变量所对应的抗剪强度值,并分别用摩尔圆法和σ_1-σ_3应力平面法求得了抗剪强度参数。结合蠕变试验曲线,绘制了长期强度曲线,建立了长期强度方程,获得了长期强度方程参数。分析了流变瞬时强度及长期强度值与不同应变量所对应抗剪强度值的关系。Xi＇an region can be the most developed area of ground fissures and the associated geo-hazard in China,with the continuous development of city construction,especially in succession of metro engineering,ground fissure disasters become restricting factors of the construction of the project. Considering the seriousness of the ground fissure disasters,through consolidated undrained conventional triaxial test with different confining pressures are made to Chang＇an ground fissures belt Q_3 undisturbed-loess in Xi＇an region. Based on the experiments,the stress-strain relationship and failure patterns under different confining pressures of ground fissures belt Q_3 undisturbed-loess were analyzed,stress-strain relation model of ground fissure belt Q_3 undisturbed-loess were established,and the shear strength values under different variables were obtained. Using Mohr＇s circle method and σ_1-σ_3 stress plane method to get the shear strength parameters. Combined with the creep test curve,drew the long-term strength curve,established long-term strength equation,and got the long-term strength equation parameters,analyzed between the rheological instantaneous strength,the long-term strength value and the shear strength values under different variables.

关 键 词：地裂缝带 Q3原状黄土 常规三轴抗剪强度 应力-应变关系 长期强度方程 

分 类 号：P642[天文地球—工程地质学]