地球物理学进展 ›› 2018, Vol. 33 ›› Issue (5): 2108-2112.doi: 10.6038/pg2018BB0410

• 应用地球物理学Ⅱ(海洋、工程、环境、仪器等) • 上一篇    下一篇

考虑相对震源深度的地应力评估方法研究

郭摇1(),姚令侃1,2,3,*(),陈秒单1   

  1. 1. 西南交通大学土木工程学院,成都 610031
    2. 陆地交通地质灾害防治技术国家工程实验室,成都 610031
    3. 高速铁路线路工程教育部重点实验室,成都 610031
  • 收稿日期:2017-11-26 修回日期:2018-06-23 出版日期:2018-10-20 发布日期:2019-01-11
  • 通讯作者: 姚令侃 E-mail:guoyao51@126.com;yaolk@swjtu.edu.cn
  • 作者简介:郭摇,男,硕士研究生,研究方向为铁路公路工程灾害防治及安全技术.
  • 基金资助:
    国家重点研发计划——区域综合交通基础设施安全保障技术项目(2016YFC0802206);国家自然科学基金项目(41571004);中国铁路总公司科技研究开发计划课题(2015G002-N)

Study of crustal stress evaluation method considering relative focal depth

GUO Yao1(),YAO Ling-kan1,2,3,*(),CHEN Miao-dan1   

  1. 1. School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China
    2. Road and Railway Engineering Research Institute, Sichuan Key Laboratory of Seismic Engineering and Technology, Chengdu 610031, China
    3. MOE Key Laboratory of High-speed Railway Engineering, Chengdu 610031, China
  • Received:2017-11-26 Revised:2018-06-23 Online:2018-10-20 Published:2019-01-11
  • Contact: Ling-kan YAO E-mail:guoyao51@126.com;yaolk@swjtu.edu.cn

摘要:

在线路工程可行性研究阶段,方案尚未确定,一般不会通过大规模的钻探查明地应力数值,而希望借鉴现有资料或经验公式对地应力状况进行评估.基于统计资料分析和逻辑推导,水平地应力的高低与相对震源深度(震源深度与地壳厚度的比值)应具有反相关关系.鉴此,增加相对震源深度作为反映研究区地应力状态的参量,对传统的水平地应力随深度分布统计回归方程进行修正.以青藏高原为例,绘制了青藏高原地域震源深度和地壳厚度分布云图,提出了相对震源深度X的确定方法;基于已有的地应力实测数据,以X和测点埋深H作为自变量,拟合得到改进地应力评估公式;经实测数据检验,与目前仅有以埋深作为自变量的评估方法相比,评估精度明显提高.

关键词: 线路工程, 可行性研究, 相对震源深度, 地应力评估方法

Abstract:

During the feasibility study of the railway route selection, it is infeasible to investigate the crustal stress by extensive drilling while the scheme is not determined,and it is helpful to use the existing information or empirical formula to evaluate the crustal stress condition. The existing researches, statistical data analysis and logical deduction indicate that the horizontal stress is positively correlated with relative focal depth(the ratio of focal depth to its crustal thickness). Thus, a correction method of adding a new variable-relative focal depth to the maximum horizontal principal stress varying with the depth formula is proposed. In view of the crustal stress in Tibetan Plateau, the focal depth and the crust thickness spatial distribution nephograms of Tibet Plateau are drawn out, and a method of calculating the relative focal depth X is proposed. Based on the existing stress measurements, relative focal depth of X and the depth of measuring points H as variable parameters, the crustal stress evaluation formula based on the relative focal depth is established, after inspected by the data measured in Lhasa to Linzhi railway tunnels, compared with the current method which uses the depth as the only independent variable, the assessment accuracy is obviously improved.

Key words: road engineering, feasibility study, relative focal depth, evaluation method of crustal stress

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