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当前位置: 首页 > 文章 > 冻融循环作用下膨胀土的力学与孔隙分布特点 山东农业大学学报(自然科学版) 2020 (2) 365-369
Position: Home > Articles > Mechanics and Pore Distribution Characteristics of Expansive Soil under the Freezing-thawing Cycle Journal of Shandong Agricultural University(Natural Science Edition) 2020 (2) 365-369

冻融循环作用下膨胀土的力学与孔隙分布特点

作  者：
田芳
单  位：
安阳职业技术学院建筑工程系
关键词：
膨胀土;冻融循环;孔隙分布
摘  要：
膨胀土是南水北调中线工程建设中涉及到的重要土层,为获取其物理、力学性质及结构特征,对南阳膨胀土进行了系统的室内土工测试,并评价了膨胀土受冻融循环的影响程度。结果表明:膨胀土内部含大量石英颗粒,黏土矿物具有典型的层状结构,主要为亲水性的蒙脱石、高岭土、伊利石等;颗粒粒径分布特殊,粗粒和黏土粒的含量均比较多,渗透系数较小;压缩系数为0.30～0.35 MPa-1,属于中等压缩土;冻融循环削弱了土体的结构强度,导致无侧限抗压强度的衰减,且衰减率随干循环次数增加逐渐趋于稳定;随冻融循环次数的增加,膨胀土内部的小孔隙比例逐渐下降,大孔隙的比例逐渐增大,且冻融循环过程中整体孔隙体积也不断增加。在冻融循环过程中,表征孔隙率大小的NMR谱面积与峰值强度呈负相关的线性关系。
译  名：
Mechanics and Pore Distribution Characteristics of Expansive Soil under the Freezing-thawing Cycle
作  者：
TIAN Fang;Department of Architectural Engineering/Anyang Vocational and Technical College;
关键词：
Expansive soil;;freezing-thawing cycle;;pore distribution
摘  要：
Expansive soil is an important soil layer involved in the slope engineering construction of the channel in the middle route of the south-north water diversion project. A series of laboratory tests were carried out to obtain physical,mechanical properties and structural characterization of expansive soils in the areas of the Nanyang City. The results show that the expansive soil contains a large number of quartz particles. The clay minerals have a typical layered structure, mainly hydrophilic montmorillonite, kaolin, illite with typical layered structure. Particle size distribution is special because the content of coarse and clay particles is high. The permeability coefficient is small. The compression coefficient is 0.30～0.35 MPa-1, which belongs to medium compression soil. The freezing-thawing cycle weakens the structural strength of soil mass,leading to the reduction of unconfined compressive strength with the attenuation rate gradually becomes stable. With the increase of freezing-thawing cycle, the proportion of small pores in the expansive soil decreases, while large pores increase and the overall pore volume also increases during the freezing-thawing cycles. During freezing-thawing cycles, there is a negative correlation between NMR spectrum area and peak strength.

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