三峡库区灰岩地区岩质边坡危岩座裂演化机制研究——以重庆市金佛山甄子岩为例

发布时间：2018-04-09 12:29

本文选题：边坡地貌演化　切入点：危岩座裂解体　出处：《重庆师范大学学报(自然科学版)》2017年03期

【摘要】：【目的】灰岩地区的危岩表现为危岩聚集体,具有类砌体结构特征;危岩座裂解体是灰岩地区危岩破坏的核心科学问题。【方法】以在三峡库区具有代表性的重庆市金佛山甄子岩为例,采用现场连续观测和地貌学方法,研究灰岩地区边坡的发育机制问题。【结果】危岩的形成与破坏是灰岩地区边坡演化的主要动力学机制,甄子岩危岩体下座过程中基座的碳质页岩表现出显著的压裂喷射现象,类砌体结构底部快速解体;甄子岩坡脚碳质页岩自然风化速度约48 mm·a-1,甄子岩危岩形成过程的地貌学解译可概化为3个阶段,每个过程边坡后退35~40m,所需时间在600a左右;灰岩地区岩质边坡演化在较短时间尺度(如甄子岩在600a左右)具有局部后退特征,但在较长时间尺度(如甄子岩在1 200a以上)表现为平行后退。【结论】研究成果对于科学解译三峡库区边坡地貌演化规律、防治灰岩地区危岩崩塌灾害有积极意义。
[Abstract]:[objective] the dangerous rock in limestone area is characterized by a mass of dangerous rock, which has the characteristics of masonry structure.The pyrolysis of perilous rock block is the core scientific problem of the destruction of dangerous rock in limestone area. [methods] taking the representative Jinfushan screening rock in the three Gorges Reservoir area as an example, continuous field observation and geomorphology methods are used.The mechanism of slope development in limestone area is studied. [results] formation and destruction of dangerous rock is the main dynamic mechanism of slope evolution in limestone area.The bottom of the similar masonry structure disintegrates rapidly, the natural weathering rate of carbonaceous shale at the foot of Zhenzi rock slope is about 48mm a-1, the geomorphological interpretation of the formation process of the dangerous rock in the Yanzi rock can be generalized into three stages, the slope retreating 35 ~ 40m in each process, and the time required is about 600a.The evolution of rock slope in limestone area has the characteristic of partial retrogression on a relatively short time scale (such as about 600a for the screening rock).But on a long time scale (for example, the Yanzi rock is more than 1 200 years old), it is shown that the parallel retrogression. [conclusion] the research results have positive significance for the interpretation of the geomorphological evolution law of the slope in the three Gorges Reservoir area and the prevention of the dangerous rock collapse disaster in the limestone area.
【作者单位】：重庆交通大学岩土工程研究所;
【基金】：国家自然科学基金(No.51678067;No.51378521;No.11272185) 重庆市首席专家工作室专项经费(No.201605) 重庆市"两江学者"计划专项资金(No.201309) 2016年重庆高校创新团队建设计划(No.CXTDG201602012)
【分类号】：P642.2

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