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为研究温度对土动力特性的影响,设计内外联合加热的温控装置,研制温控动三轴试验系统。该系统能实现10℃~100℃范围内试样温度的精确控制,并可线性调节、分级加温。最后,以宁波饱和淤泥质软黏土为例,初步开展不同温度下土的动力特性试验,验证其有效性和可靠性,试验结果表明:在不同温度下,试样的滞回圈形状及发展与常规动三轴试验结果一致;随着温度的升高,软黏土的塑性累积应变、动阻尼比和动孔压减小,动弹性模量增大,且各增量值均随温度上升而减小,反映了软黏土的热硬化特征;累积塑性应变与温度归一化结果呈指数关系。
In order to study the influence of temperature on the dynamic characteristics of soil, a temperature control device combining internal and external heating was designed and a three-axis temperature controlled testing system was developed. The system can achieve precise control of the sample temperature in the range of 10 ° C to 100 ° C, and can be linearly adjusted and graded and heated. Finally, taking the saturated silty clay in Ningbo as an example, the dynamic test of soil under different temperatures is carried out initially to verify its effectiveness and reliability. The experimental results show that at different temperatures, the shape and development of the hysteresis loop of the sample The results of conventional triaxial tests are consistent. With the increase of temperature, the plastic cumulative strain, dynamic damping ratio and moving pore pressure of soft clay decrease, and the dynamic elastic modulus increases, and the incremental values decrease with increasing temperature Small, reflecting the hot-hardening characteristics of soft clay; cumulative plastic strain and temperature normalized exponential relationship.