岩土力学2026，Vol.47Issue(2)：549-561,13.DOI:10.16285/j.rsm.2025.0777
压缩空气储能隧道式硬岩储气硐起裂角与起裂压力二维数值分析
Fracture initiation angle and pressure in tunnel-excavated hard rock caverns for compressed air energy storage:a 2D numerical analysis
胡港 1芮瑞 2江强强 2王永平 3张文涛3
作者信息
- 1. 武汉理工大学土木工程与建筑学院,湖北武汉 430070||中国葛洲坝集团股份有限公司勘测设计院,湖北武汉 430070
- 2. 武汉理工大学土木工程与建筑学院,湖北武汉 430070
- 3. 中国葛洲坝集团股份有限公司勘测设计院,湖北武汉 430070
- 折叠
摘要
Abstract
As the internal pressure gradually increases,the surrounding rock of a tunnel-type hard rock gas storage cavern will undergo three phases:fracture initiation at the cavern wall,fracture propagation,and eventual cavern failure.Fracture initiation occurs due to shear or tensile failure of the surrounding rock at the cavern wall,and is governed by the rock mass' s shear strength and tensile strength.We employed FLAC2D numerical analysis based on the Mohr-Coulomb criterion to locate fracture initiation points on the cavern wall and the associated initiation pressure,accounting for the initial stress field.Boundary effects become negligible when the lateral boundary spacing is at least 15D and the bottom boundary spacing is at least 10D(where D is cavern diameter).The lateral pressure coefficient k and cavern burial depth H significantly influence the fracture initiation angle α,the characteristic curves of fracture initiation angles exhibit two distinct patterns:exponential curve type and horizontal straight-line type;the fracture initiation pressure Po is markedly affected by multiple factors including the lateral pressure coefficient k,burial depth H,shear strength(c,φ)and tensile strength Rt,the characteristic curves of fracture initiation pressure display a piecewise-linear pattern.Using elastic theory analytical methods,this paper derives analytical calculation formulas for both fracture initiation pressure and angle.The analytical solutions for fracture initiation pressure show good agreement with the numerical results.However,because finite boundary conditions of overlying rock mass,the analytical solutions for fracture initiation angle demonstrate some discrepancies with numerical results for k in the range 0.95-1.2.关键词
压缩空气储能/隧道式储气硐/起裂角/起裂压力/特征曲线Key words
compressed air energy storage/tunnel-type gas storage cavern/fracture initiation angle/fracture initiation pressure/characteristic curve分类
建筑与水利引用本文复制引用
胡港,芮瑞,江强强,王永平,张文涛..压缩空气储能隧道式硬岩储气硐起裂角与起裂压力二维数值分析[J].岩土力学,2026,47(2):549-561,13.
