孔隙水作用下深埋硐室稳定性分析及破坏机制

doi:10.16265/j.cnki.issn1003-3033.2023.10.1568

摘要/Abstract

摘要：

为获得孔隙水作用下深埋硐室的围岩压力及其潜在破坏面,将Hoek-Brown破坏准则和极限分析定理结合,改进传统的深埋硐室“楔形体”破坏机制,并将孔隙水作用考虑到优化的深埋硐室围岩稳定性计算模型中;然后根据虚功率原理推导出孔隙水作用下深埋硐室围岩压力解析解,通过序列二次规划(SQP)算法优化得到围岩压力上限解以及拱顶、拱肩破坏范围。研究表明:Hoek-Brown准则参数中地质强度指数(GSI)、岩体常数、岩体单轴抗压强度增大时围岩压力减小,硐室的潜在塌落范围也减小,而扰动因子、岩体容重和硐室直径的增大会对硐室的稳定性产生不利影响。此外,孔隙水压力系数增大时围岩压力和塌落范围也不断增大,且随着水位线高度的增加,影响程度越加明显。

关键词: 孔隙水, 深埋硐室, 围岩稳定性, 围岩压力, 破坏机制, Hoek-Brown破坏准则

Abstract:

In order to obtain the surrounding rock pressure and its potential failure surface under the action of pore water, the Hoek-Brown failure criterion and limit analysis theorem were combined to improve the traditional "wedge" failure mechanism of deep-buried cavern, and pore water was introduced into the optimized calculation model of surrounding rock stability of deep-buried chamber. The analytical solution of surrounding rock pressure of a deep-buried chamber under the action of pore water was derived according to the principle of virtual power, and the upper bound solution of surrounding rock pressure and the collapse range of vault and arch shoulder were optimized by sequential quadratic programming (SQP) algorithm. The results show that when the geological strength index(GSI), rock mass constant and uniaxial compressive strength of rock mass in Hoek-Brown criterion parameters increase, and the potential collapse range of the chamber also decreases, while the increase of disturbance factor, rock mass weight and chamber diameter will have adverse effects on the stability of the chamber. In addition, with the increase of the pore water pressure coefficient, the surrounding rock pressure and collapse range also increase, and the influence degree becomes more obvious with the increase of the water level height. The research results can provide some theoretical guidance for the support design of underground chambers in water-rich strata.

Key words: pore water, deep buried chamber, surrounding rock stability, surrounding rock pressure, failure mechanism, Hoek-Brown failure criterion

张道兵, 朱远嫘, 尹华东, 胡阿平, 汤宇. 孔隙水作用下深埋硐室稳定性分析及破坏机制[J]. 中国安全科学学报, 2023, 33(10): 62-70.

ZHANG Daobing, ZHU Yuanlei, YIN Huadong, HU Aping, TANG Yu. Stability analysis and failure mechanism of deep-buried chamber under pore water[J]. China Safety Science Journal, 2023, 33(10): 62-70.

图/表 9

图1

表1

不同孔隙水压力下的围岩压力对比

$r u$	$σ 0 / k P a$		相对误差/%
$r u$	文献[19]	本文	相对误差/%
0.1	239.3	243.8	1.8
0.2	311.5	337.7	7.7
0.3	400.1	440.4	9.1
0.4	508.7	551.6	7.7
0.5	623.3	671.3	7.1

表1

图2

图3

图4

表2

图5

图6

图7

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Z_w/m	r_u=0	r_u=0.1	r_u=0.2	r_u=0.3	r_u=0.4	Δ1/%	Δ2/%	Δ3/%	Δ4/%
10	46.48	59.14	73.60	89.91	108.20	27.24	58.34	93.43	132.79
20	46.48	73.65	105.96	143.47	186.62	58.46	127.97	208.00	301.50
30	46.48	89.02	141.52	204.11	272.00	91.52	204.48	339.13	485.20
40	46.48	105.20	180.13	268.13	358.72	126.33	287.54	476.87	671.77