青藏高原东缘地下工程岩爆风险投图研究

杜世回

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铁道工程学报 ›› 2020, Vol. 37 ›› Issue (6) : 14-18.

长大干线：工程地质与路基

青藏高原东缘地下工程岩爆风险投图研究

杜世回^**

作者信息 +

Research on the Rock Burst Risk of Underground Engineering by Projection Method on the Eastern Margin of Tibetan Plateau

DU Shihui

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文章历史 +

摘要

研究目的:工程建设中积累的地应力实测数据可为同一区域新建地下工程大范围选线及初步勘察等阶段区域地应力值预测、岩爆风险评价提供重要参考。本文通过侧压系数回归计算,预测本地区地应力特征。按照硬质岩代表性抗压强度等级,研究投图法分析岩爆风险,并给出本地区地下工程埋深设置原则。
研究结论:(1)研究区最大水平主应力侧压系数的外包线(最大值)、中线(平均值)、内包线(最小值)分别为K_H-max=680/Z+0.91、K_H-ave=256/Z+0.78和K_H-min=56/Z+0.55;(2)以硬质岩代表性抗压强度 R_c为 70 MPa、90 MPa、110 MPa、130 MPa四个等级投图,显示青藏高原东缘地下工程发生破坏性较大的中等岩爆的埋深主要在500~1 950 m之间,中值约为1 150 m;发生强烈岩爆的埋深主要在1 200 m以上,因此在选线时应尽量降低1 150~1 200 m埋深以上的隧道长度;(3)本文提出的地应力背景值预测、地下工程埋深设置与岩爆风险投图评价方法,可指导工程技术人员在青藏高原东缘地区开展勘察设计和相关研究工作。

Abstract

Research purposes: The geostress data accumulated in the built underground engineering in a certain area can provide an important significance for the regional rock burst risk analysis of underground engineering under similar structural geology and engineering geological conditions, especially in the early stage of large-scale underground engineering, such as location selection, preliminary investigation, etc. Based on regression calculation of lateral pressure coefficient, the geostress characteristics in eastern margin of Tibetan Plateau are predicted analyzed. Then, referring to the compressive strength grade of main hard rock in the area, the risk of rock burst in this area is analyzed by the method of projection, and the principle of setting the buried depth of underground engineering in this area is given.
Research conclusions: (1) The K values in the area satisfy K_H-max=680/Z+0.91(maximum value of the K_H), K_H-ave=256/Z+0.78(average value of the K_H), K_H-min=56/Z+0.55(minimum value of the K_H). (2) When the representative compressive strength of hard rock Rc equals to 70 MPa, 90 MPa, 110 MPa and 130 MPa, the buried depth of moderate rock burst is mainly between 500~1 950 m with a median at about 1 150 m, and the buried depth of strong rock burst is mainly over 1 200 m. Therefore, attention should be paid to reducing the tunnel length with depth above 1 150~1 200 m. (3) The predicted background value of the geostress, the setting of the buried depth of underground engineering and the evaluation method of the rock burst risk map proposed in this paper can guide the engineers and technicians to carry out the investigation and design work in this area, as well as research work.

导出引用

杜世回. 青藏高原东缘地下工程岩爆风险投图研究[J]. 铁道工程学报, 2020, 37(6): 14-18

DU Shihui. Research on the Rock Burst Risk of Underground Engineering by Projection Method on the Eastern Margin of Tibetan Plateau[J]. Journal of Railway Engineering Society, 2020, 37(6): 14-18

中图分类号： P642

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