龙门山山前砂土液化初步研究

Research on the soil liquefaction in the piedmont region of the Longmen Mountain

HTML全文

摘要: 对龙门山山前的成都平原(金马河以北)和川北丘陵区进行了地震液化现场调查。结果表明:液化点主要沿河谷底部和低阶地分布,液化集中区平行于NE向龙门山地震断层,与断层的转折、终止、出现部位相对应,与地震动最大峰值加速度(PGA)等值线主轴一致。液化喷出砾石最大粒径30 cm,最大喷砂量约15m3,堆积厚达4m,冒水高达775 cm,地表破裂长达1 000m。喷砂冒水与强震动相一致,强震过后,大部分液化点上的喷砂冒水现象消失。分析表明:冒水高度总体随震中距增加而降低,亦存在随震中距增加而增高和波动的趋势。液化砂土来自第四系不同地层,并出现了下更新统下段的红色强风化泥砾。
- 砂土液化 /
- 龙门山山前区域 /
- 5.12汶川地震
Abstract: Field investigation for the Chengdu Plain(to the north of the Jinma River) and hilly area of the northern part of Sichuan province was made.The investigation shows that the distribution of the liquefaction points belong mainly to river valley,lie in flood plain and lower terraces,distribute near and parallelly with the earthquake faults of the Longmen Mountain striking in a north-east direction,aim at the turning point in the direction of the strike of the fault or places where the fault emerges...
- soil liquefaction /
- piedmont range of the Longmen Mountain /
- Wenchuan earthquake on May 12 /
- 2008