Experimental Study on Dynamic Deformation and Dynamic Strength Characteristics of Expansive Soil of Qinchong Expressway in Guangxi

doi:10.3969/j.issn.1674-0696.2023.05.08

Abstract

Abstract: To study the dynamic deformation and dynamic strength characteristics of expansive soil under long-term cyclic loading, the indoor dynamic triaxial tests were carried out on expansive soil of Qinchong Expressway in Guangxi. The effects of confining pressure and dynamic stress on the axial cumulative deformation and dynamic strength characteristics of expansive soil were analyzed. The research results show that the relationship between the axial cumulative strain of expansive soil and the vibration times presents a stable development trend when the dynamic stress is small, and a destructive development trend when the dynamic stress is large. A modified hyperbolic cumulative deformation prediction model considering the stable and destructive development trends is established, and the fitting parameters under different confining pressures and dynamic stresses are obtained. The inclination of hysteresis curve of expansive soil gradually decreases with the increase of vibration times. The shape of hysteresis curve changes from full shuttle to willow flocculent strip. With the increase of confining pressure, the hysteresis curve gradually approaches to the direction of dynamic stress axis, the slope gradually increases, and the dynamic strain gradually decreases. The dynamic strength of expansive soil shows a power function curve attenuation law with the increase of failure vibration times Nf. The dynamic cohesion cd and the dynamic internal friction angle φd decrease linearly with the increase of lgN in the semi-logarithmic coordinate, and the decrease rate of cd is greater than that of φd. After normalizing the dynamic and static strength index parameters, the normalized formula of the strength index of expansive soil changing with different failure vibration times lgN is obtained.

Key words: highway engineering; expansive soil; dynamic triaxial test; cumulative deformation; dynamic strength characteristics

摘要： 为研究膨胀土在长期循环荷载作用下的动力变形及动强度特性，对广西钦崇高速公路膨胀土开展室内动三轴试验，分析不同围压和动应力对膨胀土轴向累积变形和动强度特性的影响。研究结果表明：膨胀土轴向累积应变随振次变化关系在较小动应力时呈现稳定型发展趋势，在动应力较大时呈现破坏型发展趋势，建立了考虑稳定型和破坏型发展趋势的修正双曲线累积变形预测模型，得出了不同围压和动应力下的拟合参数；膨胀土滞回曲线倾斜程度随振次的增加而逐渐减小，形状由饱满梭形变为柳絮条状，随围压的增加滞回曲线逐渐朝动应力轴方向靠拢，斜率逐渐增大，动应变逐渐减小；膨胀土动强度随破坏振次Nf的增大呈现幂函数曲线衰减规律，动黏聚力cd和动内摩擦角φd在半对数坐标下随lgN的增加而线性减小，且cd减小速度大于φd减小速度,将动静强度指标参数进行归一化处理后，得到了膨胀土强度指标随不同破坏振次lgN变化的归一化公式。

关键词: 道路工程；膨胀土；动三轴试验；累积变形；动强度特性

CLC Number:

U416.1

TANG Xianyuan1, 2 ,WANG Shihai3, MA Jieling1，LUO Jie1. Experimental Study on Dynamic Deformation and Dynamic Strength Characteristics of Expansive Soil of Qinchong Expressway in Guangxi[J]. Journal of Chongqing Jiaotong University(Natural Science), 2023, 42(5): 61-69.

唐咸远1, 2，王诗海3,马杰灵1，罗杰1. 广西钦崇高速公路膨胀土动力变形及动强度特性试验研究[J]. 重庆交通大学学报（自然科学版）, 2023, 42(5): 61-69.

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