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Frictional heating and thermal effects of ancient rockslide sedimentology: a case study of the Dora Kamiyama Rockslide and implications for dynamic reconstruction
Bulletin of Engineering Geology and the Environment ( IF 3.7 ) Pub Date : 2022-07-19 , DOI: 10.1007/s10064-022-02824-7
Zongji Yang , Shihao Liu , Liyong Wang , Gang Liu , Wufan Dong

Sedimentological characteristics and thermal metamorphic rocks in deposits can provide clues regarding the frictional melt processes of ancient rockslides; however, the quantitative dynamic reconstruction of rockslides is hindered by the scarcity of sedimentary evidence alongside predominantly qualitative interpretations. Here, a dynamic reconstruction of the Dora Kamiyama Rockslide in the Tibetan Plateau is used to bridge dynamic parameters and sedimentary evidence based on frictional thermal analysis. Grading analysis revealed that the content of coarse-grained soil gradually decreased throughout the inverse grading sequence of the deposit, and micro-scratches on particles indicated high-speed linear sliding, with rotational and expansive motions during the rockslide. Thermal metamorphic rocks, such as tridymite, cristobalite, and magnesite, were found near the shear zones of the rockslide deposit, implying that the temperature induced by sliding friction near the fragmented facies ranged from 870 to 1,470 °C. Based on the sedimentological evidence, the dynamic process evolution because of temperature changes in the shear zone and the topographic factors of the rockslide were calculated based on frictional thermal analysis. Specifically, the friction coefficient decreased from 1.46 to 0.43, and the maximum acceleration and velocity reached 4.82 m/s2 and 47.67 m/s, respectively. The sedimentary evidence and subsequent dynamic analysis of this ancient rockslide can provide new insights into the dynamic reconstruction of large-scale rockslides, especially in the Tibetan Plateau.



中文翻译:

古代滑坡沉积学的摩擦加热和热效应:以 Dora Kamiyama 滑坡为例及其动态重建的意义

沉积物的沉积学特征和热变质岩可以为古滑坡的摩擦熔融过程提供线索;然而,岩石滑坡的定量动态重建受到沉积证据的稀缺以及主要的定性解释的阻碍。在这里,青藏高原多拉神山滑坡的动态重建被用来连接基于摩擦热分析的动态参数和沉积证据。级配分析表明,在沉积物的逆级配序列中,粗粒土含量逐渐降低,颗粒上的微划痕表明在滑坡过程中呈高速线性滑动、旋转和膨胀运动。热变质岩,如鳞石英、方石英和菱镁矿,在滑坡沉积物的剪切带附近发现,表明在破碎相附近由滑动摩擦引起的温度范围为 870 至 1,470 ℃。基于沉积学证据,基于摩擦热分析计算剪切带温度变化和滑坡地形因素引起的动力过程演化。具体来说,摩擦系数从1.46下降到0.43,最大加速度和速度达到4.82 m/s 基于摩擦热分析计算剪切带温度变化和滑坡地形因素引起的动力过程演化。具体来说,摩擦系数从1.46下降到0.43,最大加速度和速度达到4.82 m/s 基于摩擦热分析计算剪切带温度变化和滑坡地形因素引起的动力过程演化。具体来说,摩擦系数从1.46下降到0.43,最大加速度和速度达到4.82 m/s分别为2和 47.67 m/s。这一古老滑坡的沉积证据和随后的动力学分析可以为大规模滑坡的动态重建提供新的见解,特别是在青藏高原。

更新日期:2022-07-20
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