Stability analysis and failure mechanism of deep-buried chamber under pore water

doi:10.16265/j.cnki.issn1003-3033.2023.10.1568

Abstract

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

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.

Figures/Tables 9

Fig.1

Tab.1

Comparison of surrounding rock pressure under different pore water pressure

$r u$	$σ 0 / k P a$		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

Tab.1

Fig.2

Fig.3

Fig.4

Tab.2

Fig.5

Fig.6

Fig.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