Abstract In recent years, the dynamic characteristics and failure mechanism of earth building under earthquake action have been paid more attention to engineering. In the loess area, the seismic performance of the underground loess cave (ULC) dwelling is still poorly understood. In this paper, the seismic response of the ULC structure under seismic action was discussed by numerical simulation based on the shaking table test. The dynamic triaxial tests were carried out on the loess samples at different depths of the prototype. The dynamic characteristic parameters such as dynamic shear modulus and damping ratio of the original loess were measured, and the dynamic constitutive model was established to provide reliable calculation parameters for the numerical analysis of the seismic response of the ULC. Modeling by coupling finite element (FE) and infinite element (IE), the numerical analysis model of the ULC structure was established, and the loading input of external seismic was achieved on the artificial boundary. The accuracy of the loading input and established model was verified by an example of a 3D solid model. The experimental results were processed according to the similarity relation and then compared with the results of numerical simulation of the seismic response of ULC, such as tensile stress, acceleration response, displacement response, and reliability. To further explore the internal relationship between the seismic performance of the ULC, and the structure size, the parameter analysis of the loess cave model, was carried out. An evaluation suggestion related to the size of the structure during the safety assessment of the seismic performance of the existing loess caves is proposed.

中文翻译：

---

传统民居地下黄土溶洞数值分析及抗震性能研究

摘要 近年来，地震作用下土方建筑的动力特性及破坏机制越来越受到工程界的重视。在黄土地区，地下黄土溶洞（ULC）住宅的抗震性能仍知之甚少。本文在振动台试验的基础上，通过数值模拟讨论了超轻型混凝土结构在地震作用下的地震响应。对原型不同深度的黄土样品进行了动力三轴试验。测量了原黄土的动剪模量、阻尼比等动力特性参数，建立了动力本构模型，为超大型储层地震响应的数值分析提供了可靠的计算参数。通过耦合有限元（FE）和无限元（IE）建模，建立了ULC结构的数值分析模型，并在人工边界上实现了外部地震的加载输入。通过一个3D实体模型的例子验证了加载输入和建立模型的准确性。根据相似关系对试验结果进行处理，然后与ULC地震响应的数值模拟结果，如拉应力、加速度响应、位移响应、可靠性等进行比较。为进一步探究ULC抗震性能与结构尺寸之间的内在关系，对黄土溶洞模型进行了参数分析。