孙萍萍,冯立,张茂省,王晓飞,刘蒙蒙,王帅.洛川典型剖面黄土的非饱和参数测试与分析[J].西北地质,2019,52(2):148-157
洛川典型剖面黄土的非饱和参数测试与分析
Measurement and Parameters Analysis for Soil-water Characteristic Curve of Unsaturated Loess Deposited at Different time in the Luochuan Section
投稿时间:2019-02-12  修订日期:2019-04-20
DOI:10.19751/j.cnki.61-1149/p.2019.02.015
中文关键词:  黄土-古土壤;土-水特征曲线;非饱和土;洛川剖面;参数分析
英文关键词:loess-paleosol;soil-water characteristic curve;unsaturated loess;Luochuan section;parameters analysis
基金项目:国家重点研发项目(2018YFC1504700),国家自然科学基金重点项目(41530640、41641011),中国地质调查局项目(DD20160261、DD20189270)联合资助
作者单位E-mail
孙萍萍 西北大学地质系/大陆动力学国家重点实验室, 陕西 西安 710069
中国地质调查局西安地质调查中心/西北地质科技创新中心, 自然资源部黄土地质灾害重点实验室, 陕西 西安 710054 
 
冯立 中国地质调查局西安地质调查中心/西北地质科技创新中心, 自然资源部黄土地质灾害重点实验室, 陕西 西安 710054  
张茂省 中国地质调查局西安地质调查中心/西北地质科技创新中心, 自然资源部黄土地质灾害重点实验室, 陕西 西安 710054 xazms@126.com 
王晓飞 延安市气象局, 陕西 延安 716000  
刘蒙蒙 中国地质调查局西安地质调查中心/西北地质科技创新中心, 自然资源部黄土地质灾害重点实验室, 陕西 西安 710054  
王帅 中国地质调查局西安地质调查中心/西北地质科技创新中心, 自然资源部黄土地质灾害重点实验室, 陕西 西安 710054  
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中文摘要:
      土-水特征曲线是反映非饱和土基本特性的本构曲线,是土质斜坡非饱和渗流和力学机制分析中的重要参数。但受限于实验设备和测试技术等条件的限制,使得土-水特征曲线的测试耗时长、难度大,且多数测试方法难以实现全吸力范围内(0~106 kPa)的曲线测定,间接获取土-水特性曲线的模型拟合法,通常又存在因参数多解性而导致的结果失真等问题。现有的黄土高原非饱和特征曲线测试结果多集中于马兰黄土(L1),而其下的几十层黄土、古土壤的测试尚基本属于空白。笔者基于TRIM试验测试技术,对洛川黄土剖面的29层黄土-古土壤序列进行测试,获取了土-水特征曲线、吸应力特征曲线和渗透系数函数等系列参数,建立了黄土高原非饱和黄土工程特性标准剖面。通过对各参数综合分析发现,各物性参数在垂向上随深度呈现相似的变化规律,且均在黄土-古土壤的接触带参数变化较大;粘土矿物成分和孔隙结构特征是影响非饱和土-水特征曲线的重要参数,且与曲线参数αn存在一定的非线性关系。
英文摘要:
      Soil-water characteristic curve (SWCC) is the constitutive-curve to reflect the basic characteristics of unsaturated soil, which plays an important role in seepage and mechanical mechanism analysis for unsaturated slope. However, subjected to the limitation of experimental equipment and testing technique, it is usually time consuming and difficult to acquire the soil-water characteristic curves. It is difficult to acquire the SWCC in a whole suction range (0~106 kPa) for the existing testing methods. Problems such as distorted results caused by multiplicity of inversion and interpretation are common. The existing tested SWCC are mainly focused on the Malan loess (L1), and the results for its following layers of loess and paleosol soil is almost blank. Take the Luochuan loess section at Yan'an city Shaanxi province as an example, the basic physical parameters, the material contents and the SWCCs have been experimented for the 29 layers of loess and paleosol soil by introducing the Transient Release and Imbibition Method (TRIM) technique has been introduced in this paper. And the standard profile for unsaturated engineering properties is established. Based on the comprehensive analysis of the parameters, it is observed that the different physical parameters of the soils at each layer change with depth similarly, and vary greatly at the transitional zone between loess and paleosol soil. Clay mineral contents and pore structure characteristics are two key factors affecting the SWCC, and they are nonlinearly corelated to the parameters of α and n.
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