金沙江特大桥区域地质构造特征及稳定性分析

Abstract
Figure/Table
References
Related Citation (15)

Download: PDF (1622 KB) HTML (1 KB)
Export: BibTeX | EndNote (RIS)

Abstract Research purposes: Located in the Tiger Leaping Gorge area of northwest Yunnan Province, the Jinsha River Bridge is affected greatly by the outer strong earthquake zone. The structural environment of the project area is very complicated, includes fault structures, strong neotectonic movement and frequent earthquake. In history, the maximum intensity affected by earthquake is Ⅷ. Based on the data obtained from field survey, drilling, geophysical prospecting, adit exploration and indoor and outdoor experiments recently, this paper has analyzed and studied the characteristics of regional active faults, seismicity and structural stability, which provides a scientific basis for the comparison and selection of bridge positions.
Research conclusions: (l) The near-field area presents a tectonic pattern of fault blocks, which is manifested as intermittent overall uplift of fault blocks themselves since the Neoid. In general, the earth stress is mainly horizontal stress. (2) Active faults develop in the region, and the Zhongdian-Longpan-Qiaohou fault which has been active obviously since the Holocene, has the greatest influence on bridge engineering. With 7.9 degrees of the intensity of 50-years 10% overshoot probability and 226.7g of the peak acceleration of bedrock, there is still the possibility of multiple earthquakes of magnitude 7 or above in the next 100 years at the bridge site. (3) With the poor structural stability of the project area, the bridge should pass through the areas with low site stability index by choosing the best from the worst. (4) The research result has guiding significance for the planning site selection and engineering construction of bridge projects in active structural areas.

Key words： geological structure active fault earthquake stability analysis

Received: 20 June 2023

PACS:

U212.22

	Service

	E-mail this article
	Add to my bookshelf
	Add to citation manager
	E-mail Alert
	RSS
	Articles by authors
	CHAI Chunyang
	ZHANG Guangze
	ZHANG Xiaolin
	LUO Liangcheng
	ZHANG Ming

Cite this article:

CHAI Chunyang,ZHANG Guangze,ZHANG Xiaolin, et al. Regional Geological Structure Characteristics and Stability Analysis of Jinsha River Bridge[J]. Journal of Railway Engineering Society, 2023, 40(10): 34-39.

URL:

https://tdgcxb.crec.cn/EN/ OR https://tdgcxb.crec.cn/EN/Y2023/V40/I10/34

[1]	宋章,王朋,张广泽,等.金沙江特大桥岸坡岩体结构特征及工程力学性状[J].高速铁路技术,2017(4): 38-44.Song Zhang,Wang Peng,Zhang Guangze,etc. Structure Characteristics and Its Engineering Mechanics Behaviors of Slope Rock Mass of Chin-sha River Super Major Bridge[J].High Speed Railway Technology,2017(4):38-44.
[2]	王思敬,李国和.金沙江流域区域地壳稳定性分区与定量评价[J].工程地质学报,1998(4):291-300.Wang Sijing,Li Guohe. Quantitative Assessment and Zonation of Regional Crustal Stability in the Jinshajiang River Basin[J].Journal of Engineering Geology,1998(4):291-300.
[3]	王运生.虎跳峡水电工程区域构造稳定性工程地质研究[D].成都:成都理工大学,1998.Wang Yunsheng. A Study of Regional Tectonic Stability on Engineering Geology in Hutiaoxia Hvdropower Pivot[D]. Chengdu:Chengdu University of Technology,1998.
[4]	宋章, 朱颖, 魏永幸, 等. 滇藏铁路三江并流区工程地质减灾选线研究[J]. 铁道工程学报, 2019(2): 1-6. Song Zhang,Zhu Ying,Wei Yongxin G,etc.Research on the Engineering Geological Hazard-reduction Route Selection in Three Parallel River Region of the Yunnan-Tibet Railway[J].Journal of Railway Engineering Society,2019(2): 1-6.
[5]	樊文杰, 崔效锋, 赵小艳. 滇西北地区现今构造应力状态及其与地震的关系[J]. 地震学报, 2022(4):632-643.Fan Wenjie,Cui Xiaofeng,Zhao Xiaoyan. Current State of Tectonic Stress in Northwestern Yunnan and Its Relationship with Earthquakes[J]. Acta Seismologica Sinica, 2022(4):632-643.
[6]	许再良,李国和,许兆义,等.鲁南地区区域地壳稳定性评价与胶新铁路地质选线[J].工程地质学报,2002(2):210-215.Xu Zailiang,Li Guohe,Xu Zhaoyi, etc.Assessment of Regional Crust Stability of South Shandong Province and Site Selection for Jiaoxin Railway[J].Journal of Engineering Geology, 2002(2):210-215.
[7]	陈文军, 李大猛, 陈孝兵, 等. 基于聚类分析的工程建设场地区域构造稳定性评价[J]. 重庆科技学院学报:自然科学版,2019(5): 92-95.Chen Wenjun,Li Dameng,Chen Xiaobing, etc. Study on Evaluation of Regional Structure Stability of Construction Site Based on Cluster Analysis[J]. Journal of Chongqing University of Science and Technology:Natural Sciences Edition,2019(5):92-95.
[8]	杨继业,李占军,刘然,等.GIS支持下的输电线路地质稳定性评价[J].电子技术应用,2018(S):220-224.Yang Jiye,Li Zhanjun,Liu Ran,etc.Geological Stability Evaluation of Transmission Lines Based on GIS[J].Application of Electronic Technique,2018(S):220-224.