Complex Modeling of the Effects of Blasting on the Stability of Surrounding Rocks and Embankment in Water‐Conveyance Tunnels

Zhou, Xianqi; Yu, Jin; Ye, Jinbi; Liu, Shiyu; Liao, Ren-guo; Li, Xiu-wen

doi:10.1155/2018/4654315

Cited by 5 publications

(3 citation statements)

References 20 publications

(26 reference statements)

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“…Once explosion occurred, the explosion wave propagates into the air and then surrounding structural members would be exposed to the wave pressure. This wave load directly influences the structural failure [19]. The impact exerted on the structure under explosion depends on several factors such as the type of explosive material, released energy, and ignition location.…”

Section: Explosion Event Definitionmentioning

confidence: 99%

A Stepwise Risk Assessment for Explosion Events considering Probability Distribution of Explosion Load Parameters

Kang

Wang

2018

Complexity

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The potential risk of explosion always exists in offshore topside facilities that deal with flammable materials. Thus, explosion risk analysis taking into account possible scenarios should be performed during the design process to reduce probability of such terrible accidents. There are several technical documents for explosion risk analysis. The analysis usually includes performance criteria, risk acceptance range, and corresponding explosion design load taking into account explosion pressure. However, this standard procedure is not sufficient to assess the potential risk of explosion, since it is usually based solely on the severity of overpressure. Therefore, more in-depth analysis is required to understand the potential risk taking explosion wave profiles into account. In the present paper, a stepwise analysis of gas explosion risk elements has been performed. Quantitative and qualitative analyses of explosion risk have been performed based on the framework of typical explosion risk analysis methods. In addition, both the probability distribution of explosion load parameters taking into account overpressure and its impulse and their correlation have been investigated extensively.

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Section: Explosion Event Definitionmentioning

confidence: 99%

A Stepwise Risk Assessment for Explosion Events considering Probability Distribution of Explosion Load Parameters

Kang

Wang

2018

Complexity

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“…Numerous researchers have investigated infilled jointed rock masses from theoretical and experimental aspects. Zhou et al [4] used the professional finite difference software FLAC3D to carry out complex modeling and numerical simulation of embankment stability of tunnel blasting force to reveal the relationship between the blasting seismic wave and vibration velocity and embankment displacement under different excavation steps. However, the effect of joints on blasting seismic waves has not been analyzed in the greater depth.…”

Section: Introductionmentioning

confidence: 99%

Fluctuation Characteristic Test of Oblique Stress Waves in Infilled Jointed Rock and Study of the Analytic Method

Liu

et al. 2020

Advances in Civil Engineering

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The propagation of stress waves in filled jointed rocks involves two important influencing factors: transmission-reflection phenomena and energy attenuation. In this paper, the split Hopkinson pressure bar (SHPB) test is used to shock the filled rock with joint angles of 0, 30, and 45° and the thickness of 4 mm and 10 mm, respectively, in three different velocities. The wave curves of the incident wave, reflected wave, and transmission are obtained. The effects of the filling angle and joint thickness on wave propagation are analyzed. Based on the propagation characteristics of stress waves in joints, the stress expression of oblique incident stress waves propagating in filling joints is derived, and the energy coefficient of transmission and reflection is calculated. The results show that the propagation of stress wave in filling joints is related to the impact rate. The larger the impact rate is, the larger the maximum voltage amplitude of the three waves is. And the increasing amplitude of the incident and reflected waves is larger than the transmitted wave; the greater the impact velocity is, the smaller the stress-strain curve gap of the three dip joints is, and the fracture strength of the specimen decreases with the increase of the joint dip angle. The larger the joint dip angle is, the smaller the deformation of the rock-like specimen is. The change of the transmission coefficient is related to the joint angle, and the larger joint angle weakens the influence of the joint width on the transmission of the transmitted wave; under each impact velocity, the theoretical and experimental stress peaks are approximately the same, and the transmission coefficient maintains a good consistency with the oblique incident angle.

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“…Local rupture of rock masses, which refers to successive ruptures and unfractured areas in surrounding rocks on roadway sides and working faces, is common in deep mining [1,2]. e local rupture phenomena of rock masses decrease the bearing capacity of surrounding rocks.…”

Section: Introductionmentioning

confidence: 99%

The Research on Strain-Softening Characteristics and Local Fracture Law of Deep Granite Roadway

Sun

Wang

2020

Complexity

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The complex mechanical properties of deep surrounding rocks during excavation and unloading have always been a concern in engineering communities. Based on deep roadway engineering, the mechanical properties of granite strain-softening were investigated by laboratory tests. An exponential relationship between granite peak softening modulus and confining pressure was obtained using a nonlinear fitting method. A strain-softening model was developed based on plasticity theory for granite which took into account the nonlinear dilatancy angle and confining pressure. A mathematical model was developed using FLAC3D as platform. By developing a numerical model for a deep roadway, the local fracture characteristics of deep surrounding rocks under strain-softening conditions were evaluated. It has been found that the postpeak failure of granite had a tendency for brittle-ductile transformation. Under high confining pressure conditions, granite exhibited brittle failure characteristics during the postpeak period, and the postpeak softening modulus was decreased with the increase of confining pressure. From FLAC3D numerical calculations, it was found that the numerical models of different mesh densities had basically the same characteristic curves of surrounding rocks, which showed that the local cracking phenomenon had little effect on calculation results when the convergence constraint method was applied for the calculation of the stability of supporting structures and surrounding rocks. It was seen from the numerical simulation analyses of surrounding rock local fracture properties in deep roadways that plastic shear strain appeared in the local areas of roadway vault and arch foot, which basically coincided with the damage location and depth of surrounding roadway rocks.

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Complex Modeling of the Effects of Blasting on the Stability of Surrounding Rocks and Embankment in Water‐Conveyance Tunnels

Cited by 5 publications

References 20 publications

A Stepwise Risk Assessment for Explosion Events considering Probability Distribution of Explosion Load Parameters

A Stepwise Risk Assessment for Explosion Events considering Probability Distribution of Explosion Load Parameters

Fluctuation Characteristic Test of Oblique Stress Waves in Infilled Jointed Rock and Study of the Analytic Method

The Research on Strain-Softening Characteristics and Local Fracture Law of Deep Granite Roadway

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