中文摘要：

针对水土流失十分严重,极易发生沙砾型泥石流的沟道,根据泥石流作用下拦挡结构的承载力和水石分离的技术需要,提出受力合理的新型空间网格拦挡体系;结合实际工程的具体尺寸建立计算模型,运用显示动力学软件LS-DYNA进行数值模拟;考虑冲击物作用在结构不同位置时的动力响应,探讨该结构的动力特征.结果表明,此种类型的体系可以满足结构抗冲击的要求,满足实现水石分离的需要,并符合有效地拦挡泥石流块石的要求;结构的动力性能与静力性能差别较大,设计时应充分考虑结构的动力效应;在同一速度冲击物撞击结构不同位置时,动力响应差别较大,设计时应充分考虑结构的动力效应;结构的动力响应还受到坡度的影响.考虑到泥石流作用的随机性,计算了多冲击物作用于结构不同位置时结构的动力响应.

英文摘要：

Aimed at the gulley for drainage of gravelly debris flow which is ready to happen in the case of serious soil erosion and according to the bearing capacity of the blocking structure under the action of deb- ris flow and the technical requirement of separation of water from stone, a new space networked blocking system with rational stress was put forward, a computation model was established according to the con- crete dimensions of the actual project, its numeric simulation was conducted by using explicit dynamic software LS-DYNA, and the dynamic feature of this structure was explored as the dynamic response of the impacting object acting on the structure at different positions being taken into consideration. The result shows that this type of system can satisfy the structure anti-impact requirement, can meet the needs of re- alization of separation of water from stone, and also can meet the requirement of effective blockage of blocked stone in debris flow. The distinction between dynamic performance and static performance will be greater and the distinction of dynamic response of the structure under impaction on different spots with i- dentical velocity will be also larger, so that the dynamic effect of the structure should sufficiently be con- sidered during the process of structure design. The dynamic response of the structure will also be affected by the slope. Because of the randomness of the action of debris flow, the dynamic response of the structure under impaction of multiple impacting objects on different spots of the structure is also evaluated during analysis.