芦山地震汤家沟滑坡-碎屑流过程模拟

发布时间：2019-02-17 08:07

【摘要】：2013年4月20日四川省芦山县发生Ms7.0级强烈地震,诱发芦山县、天全县、宝兴县等多个县区2500多处崩塌、落石、滑坡、泥石流等次生灾害,但规模较小。天全县老杨乡汤家沟滑坡-碎屑流是此次地震诱发的最大一处滑坡,在地震作用下约有53万m~3的岩体自滑源区高速滑出。因剪出口下方山脊的阻挡作用滑体沿左右两侧发生分叉,此后分别沿春尖窝沟和干沟头沟高速运动,滑行约340 m和440 m后与各自沟谷侧壁发生撞击、爬坡解体为碎屑流,碰撞转向后继续向下滑行,总滑行距离约1.6 km,高程差约480 m。尽管关于芦山地震滑坡的研究很多,但对滑坡全过程动态模拟的研究较少。本文通过滑坡现场调查,解析了汤家沟滑坡的基本运动特征和滑体运动过程中发生的碰撞、铲刮、堆积等现象,并基于DAN3D动力分析软件,采用Friction-Voellmy复合模型反演了汤家沟滑坡运动全过程,得到了滑体的堆积、速度分布以及铲刮等特征。
[Abstract]:On April 20, 2013, a strong earthquake with magnitude Ms7.0 occurred in Lushan County, Sichuan Province, which induced more than 2500 secondary disasters such as collapse, rock fall, landslide, debris flow and so on in many counties, such as Lushan County, Tianquan County and Baoxing County, but on a small scale. Tangjiagou landslide in Laoyang County is the largest landslide induced by the earthquake. About 530000 mm3 of rock body slid out of the source area at high speed under the earthquake. Because of the blocking effect of ridges at the bottom of the clipping outlet, the slider forks along the left and right sides, and then moves along the spring tip fossa and the trunk trench respectively at high speed. After sliding about 340 m and 440 m, the sliders collide with the lateral walls of their respective gullies, and the slope disintegrates into a debris flow. The gliding distance is about 1. 6 km, and the height difference is about 480m. Although there are a lot of researches on Lushan earthquake landslide, there are few researches on the whole process of landslide dynamic simulation. In this paper, the basic motion characteristics of Tangjiagou landslide and the phenomena of collision, shovel scraping and accumulation in the course of sliding body movement are analyzed through the site investigation of the landslide, and based on the DAN3D dynamic analysis software, The whole movement process of Tangjiagou landslide was inversed by Friction-Voellmy complex model, and the characteristics of the accumulation, velocity distribution and shovel scraping of the sliding body were obtained.
【作者单位】：上海交通大学土木工程系;
【基金】：国家自然科学基金重点项目(41530639)~~
【分类号】：P642.22

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