中山大学学报自然科学版 ›› 2019, Vol. 58 ›› Issue (5): 49-58.doi: 10.13471/j.cnki.acta.snus.2019.05.008

• 论文 • 上一篇    下一篇

地铁建设运营期的地质风险可拓评估模型研究

陈庆1,高燕1,朱煜珣1,袁泉2   

  1. 1. 中山大学地球科学与工程学院∥广东省地球动力作用与地质灾害重点实验室,广东 广州 510275;
    2. 广州地铁设计研究院股份有限公司,广东 广州 510010
  • 收稿日期:2018-06-17 出版日期:2019-09-25 发布日期:2019-09-25
  • 通讯作者: 高燕(1984生),女;研究方向:土的宏微观结构性,隧道稳定性与监测,地下工程;E-mail: gaoyan25@mail.sysu.edu.cn

The geological risk assessment model based on extension method in subway construction and operation period

CHEN Qing1, GAO Yan1, ZHU Yuxun1, YUAN Quan2   

  1. 1. School of Earth Sciences and Engineering∥Guangdong Provincal Key Lab of Geodynamics and Geohazards,Sun Yat-sen University, Guangzhou 510275, China;
    2. Guangzhou Metro Design and Research Institute Company, Limited Guangzhou 510010, China
  • Received:2018-06-17 Online:2019-09-25 Published:2019-09-25

摘要:

地质环境载体的不确定性和模糊性制约着地下工程的设计与建设,因而对施工地段的地质风险进行评估是十分必要的。目前地铁风险评估方法中仍存在着地质风险因素考虑不足、评价指标权重的确定主观性较大等问题。本文选取了土的力学性质、岩体性质、管涌条件、地下水、岩溶、区域稳定性等6个一级地质风险评价指标,每个一级地质风险评价指标由若干个二级评价指标表征,并综合整理目前对单一地质风险评价指标的评价中较为成熟的评估方法,应用于一级评价指标风险等级的确定,建立了较为全面和合理的地质风险评价指标体系;针对各评价指标的多样性和由单指标给出的评估结果的不相容性,通过可拓学理论中的简单关联函数与关联度,客观定量地确定各指标的权重,将定量计算与定性分析相结合,减少了传统评估方法中权重赋值的主观性;进而建立了基于可拓评估方法的地质风险评估模型。并以广州某地铁车站路段为例,应用该模型对其进行地质风险评价与模型验证。结果表明:模型中地质风险等级划分合理,能够客观地反映当地地质风险情况;该地铁段未处理前地质环境风险等级属于“中等风险”,风险等级变量特征值为1.94,属于“中度风险”偏向“低风险”的级别,模型的评估结果与现场勘察结果相符,评估效果良好。

关键词: 地铁风险评估, 地质风险等级, 可拓学评估, 权重, 地铁建设

Abstract:

The construction of underground project can be seriously affected due to the uncertainty and ambiguity of geological conditions. However, the geological risk factors are not given a thorough consideration in the risk assessment methods, while the weight is determined subjectively. In this paper, six first-level geological risk assessment indicators: soil mechanical properties, rock mass properties, inrush conditions, groundwater, karst, and regional stability are selected. Each of first-level indicators is characterized by several secondary-level evaluation indicators. Then a more comprehensive and reasonable geological risk evaluation index system is established by integrating and applying existing evaluation methods of single geological risk evaluation indicators to determine the risk level of the first-level evaluation indicators. In view of the diversity of the indicators and the incompatibility of the assessment result given by a single indicator, a geological risk assessment model is established based on the extension method. The simple correlation function in extension theory is used to calculate the weight of each indicator, which is more objective and reasonable than traditional methods. The model was adopted to evaluate the risk of a station in Guangzhou. It is found that the geological risk level division is reasonable, and can reflect the local geological risk situation objectively; the geological risk level of the station in untreated condition is “moderate risk”, and the eigenvalues of risk grade is 1.94, which indicates that “moderate risk” is biased toward the “low risk” level. The assessment result agrees with the site investigation, so the evaluation result is precise.

Key words: risk assessment, geological risk level, extension method, weight, subway construction

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