Geomechanical model test on dam stability and application to Jinping High arch dam

Cheng, Yuan; Zhang, Lin; Yang, Bohan; Dong, Jianhua; Chen, Jianye

doi:10.1016/j.ijrmms.2015.01.001

Cited by 34 publications

(9 citation statements)

References 11 publications

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“…The theory of the comprehensive method includes the overloading method and the strength reduction method [20,21].…”

Section: Comprehensive Methods For High Bedding Rock Slopementioning

confidence: 99%

“…For the strength reduction range of structural planes, Yang [20] conducted triaxial compression tests and the water-rock coupling triaxial compression test in MTS815 rock mechanics testing system, and the weakening rates of weak rock and structural planes were obtained. According to substantial engineering experience and test data [20][21][22], the strength reduction range of the structural planes is normally 15-30%, which means the strength reserve factor K ss is approximately 1.15-1.3. For the uplift stage, the overload factor K sp can be obtain by formula 8.…”

Section: Failure Definition In the Comprehensive Methodsmentioning

confidence: 99%

“…Then, the antishear strength τ (f , c ) of the materials will be decreased accordingly. Thus, strength reduction materials can be used to simulate reduction of the mechanical parameters of structural planes [21,22,25].…”

Section: Development Of Strength Reduction Materialsmentioning

confidence: 99%

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Comprehensive Method to Test the Stability of High Bedding Rock Slop Subjected to Atomized Rain

et al. 2020

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In the construction of high dams, many high rock slope failures occur due to flood discharge atomized rain. Based on the steel frame lifting technique and strength reduction materials, a comprehensive method is proposed in this paper to study the stability of high bedding rock slope subjected to atomized rain. The safety factor expression of the comprehensive method and the evaluation method for deformation instability were established according to the similarity theory of geomechanical model, failure criterion, and mutation theory. Strength reduction materials were developed to simulate the strength reduction of structural planes caused by rainfall infiltration. A typical test was carried out on the high bedding rock slope in the Baihetan Hydropower Station. The results showed that the failure modes of the bedding rock slope were of two types: sliding–fracturing and fracturing–sliding. The first slip block at the exposed place of the structural plane was sliding–fracturing. Other succeeding slip blocks were mainly of the fracturing–sliding type due to the blocking effect of the first slip block. The failure sequence of the slip blocks along the structural planes was graded into multiple levels. The slip blocks along the upper structural planes were formed first. Concrete plugs had effective reinforcement to improve the shear resistance of the structural planes and inhibit rock dislocation. Finite element method (FEM) simulation was also performed to simulate the whole process of slope failure. The FEM simulation results agreed well with the test results. This research provides an improved understanding of the physical behavior and the failure modes of high bedding rock slopes subjected to atomized rain.

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“…The theory of the comprehensive method includes the overloading method and the strength reduction method [20,21].…”

Section: Comprehensive Methods For High Bedding Rock Slopementioning

confidence: 99%

Section: Failure Definition In the Comprehensive Methodsmentioning

confidence: 99%

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Comprehensive Method to Test the Stability of High Bedding Rock Slop Subjected to Atomized Rain

et al. 2020

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“…Water conservancy, and hydropower, civil, and transportation engineering involve a plethora of infrastructure construction, such as the rock foundations of hydraulic structures (mainly dams and bridge-pier foundations), and various types of construction and excavation platforms [1]. Blasting is currently the most commonly used construction method for large foundation excavation and forming.…”

Section: Research Backgroundmentioning

confidence: 99%

Piezoceramic-Based Damage Monitoring of Concrete Structure for Underwater Blasting

Zhong

Xiong

2020

Sensors

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This paper developed a piezoelectric-transducer-based damage detection of concrete materials after blasting. Two specimens (with or without an energy-relieving structure) were subjected to a 40 m deep-underwater blasting load in an underwater-explosion vessel, and their damage was detected by a multifunctional piezoelectric-signal-monitoring and -analysis system before and after the explosion. Statistical-data analysis of the piezoelectric signals revealed four zones: crushing, fracture, damage, and safe zones. The signal energy was analyzed and calculated by wavelet-packet analysis, and the blasting-damage index was obtained after the concrete specimen was subjected to the impact load of the underwater explosion. The damage of the two specimens gradually decreased from the blast hole to the bottom of the specimen. The damage index of the specimen with the energy-relieving structure differed for the fracture area and the damage area, and the damage protection of the energy-relieving structure was prominent at the bottom of the specimen. The piezoelectric-transducer-based damage monitoring of concrete materials is sensitive to underwater blasting, and with wavelet-packet-energy analysis, it can be used for postblasting damage detection and the evaluation of concrete materials.

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“…Zhu et al conducted a model test of an underground cavern group in 3D stress state at great depth by a resin-based equivalent material, in which cracking and failure of the surrounding rock masses at various overburden depths were monitored [7]. Liu et al and Chen et al modelled the high arch dam by equivalent material blocks and investigated the stability of foundation [8,9]. The model built by equivalent material also is used to investigate the performance of the surrounding rocks of tunnels and mining openings [10,11].…”

Section: Introductionmentioning

confidence: 99%

Bulk Density Adjustment of Resin-Based Equivalent Material for Geomechanical Model Test

Fan

Xing

et al. 2015

Advances in Materials Science and Engineering

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An equivalent material is of significance to the simulation of prototype rock in geomechanical model test. Researchers attempt to ensure that the bulk density of equivalent material is equal to that of prototype rock. In this work, barite sand was used to increase the bulk density of a resin-based equivalent material. The variation law of the bulk density was revealed in the simulation of a prototype rock of a different bulk density. Over 300 specimens were made for uniaxial compression test. Test results indicated that the substitution of quartz sand by barite sand had no apparent influence on the uniaxial compressive strength and elastic modulus of the specimens but can increase the bulk density, according to the proportional coarse aggregate content. An ideal linearity was found in the relationship between the barite sand substitution ratio and the bulk density. The relationship between the bulk density and the usage of coarse aggregate and barite sand was also presented. The test results provided an insight into the bulk density adjustment of resin-based equivalent materials.

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Geomechanical model test on dam stability and application to Jinping High arch dam

Cited by 34 publications

References 11 publications

Comprehensive Method to Test the Stability of High Bedding Rock Slop Subjected to Atomized Rain

Comprehensive Method to Test the Stability of High Bedding Rock Slop Subjected to Atomized Rain

Piezoceramic-Based Damage Monitoring of Concrete Structure for Underwater Blasting

Bulk Density Adjustment of Resin-Based Equivalent Material for Geomechanical Model Test

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