The Experts below are selected from a list of 3816 Experts worldwide ranked by ideXlab platform
Wei Shen Zhu - One of the best experts on this subject based on the ideXlab platform.
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A New Method to Determining the Strength Parameters of Fractured Rock Mass
Advanced Materials Research, 2014Co-Authors: Yun Hua Guo, Wei Shen ZhuAbstract:A Hydropower Station is located in the middle reach of the Dadu River in southwest China. The natural slope angles are generally 40°~65° and the relative elevation drop is more than 600m. Complex different fractures such as faults, dykes and dense fracture zones due to unloading are developed. Many abutment slopes were formed during construction of the abutments. The stability of these steep and high slopes during construction and operation period plays an important role for the safe construction and operation of the hydropower station. According to the statistical distribution of joints and fractures at the construction site, the slope is divided into a number of engineering geological zones. For each zone, a stochastic fracture network and a numerical model which is close to the real state of the Fractured Rock Mass are established by the Monte-Carlo method. The mechanical response of Fractured Rock Masses with different sizes of numerical models is studied using FLAC3D. The REV characteristic scale is identified for Rock Masses in the slopes with stochastic fracture network. Numerical simulation is performed to obtain the stress-strain curve, the mechanical parameters and the strength of the jointed Rock Mass in the zone. A constitutive relationship reflecting the mechanical response of the jointed Rock Mass in the zone is established. The Comparison between the traditional method and the method in this paper has been made at the end.
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Study on Seepage Field of Artificial Water Curtains for Underground Petroleum Storage Caverns in Fractured Rock Mass
Applied Mechanics and Materials, 2013Co-Authors: Yun Peng Zhang, Wei Shen ZhuAbstract:Based on joint statistics from the in-situ survey, using numerical simulation technique of joint network (Monte-Carlo method), the calculation model of Fractured Rock Mass is generated. Underground seepage discharge filed in Fractured Rock Mass surrounding storage caverns is analyzed by using distinct element method. The result of simulation has shown good agreement with surveying data. Two cases have been simulated that is water curtains is installed and is not installed. Water pressure distributions in joints are investigated in these two cases. It is shown that in the case without water curtain the groundwater in joints which locate the upper of underground caverns is drained out and water sealed conditions is completely unrealized. When water curtain pressure is set at 0.3MPa, can underground water seal the storage caverns.
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Research on Seepage Field in Fractured Rock Mass of Underground Oil Storage Cave Using Distinct Element Method
Applied Mechanics and Materials, 2013Co-Authors: Yun Peng Zhang, Wei Shen ZhuAbstract:The distribution of hydraulic pressure in Fractured Rock Mass surrounding caverns after excavation and technique of stochastic generation of joint network are investigated based on discrete element method. In order to seal the oil in underground caverns with water in the actual engineering, a water curtain with water pressure is installed, and the changes of hydraulic pressure are simulated with a series of curtain pressures. It is shown that some joints that have been drained out during excavation can not be saturated if the water curtain pressure is less than a certain value. Water curtain pressure with a certain value gives a strong safe guarantee of saving oil in the underground petroleum storage caverns.
Yun Peng Zhang - One of the best experts on this subject based on the ideXlab platform.
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Study on Seepage Field of Artificial Water Curtains for Underground Petroleum Storage Caverns in Fractured Rock Mass
Applied Mechanics and Materials, 2013Co-Authors: Yun Peng Zhang, Wei Shen ZhuAbstract:Based on joint statistics from the in-situ survey, using numerical simulation technique of joint network (Monte-Carlo method), the calculation model of Fractured Rock Mass is generated. Underground seepage discharge filed in Fractured Rock Mass surrounding storage caverns is analyzed by using distinct element method. The result of simulation has shown good agreement with surveying data. Two cases have been simulated that is water curtains is installed and is not installed. Water pressure distributions in joints are investigated in these two cases. It is shown that in the case without water curtain the groundwater in joints which locate the upper of underground caverns is drained out and water sealed conditions is completely unrealized. When water curtain pressure is set at 0.3MPa, can underground water seal the storage caverns.
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Research on Seepage Field in Fractured Rock Mass of Underground Oil Storage Cave Using Distinct Element Method
Applied Mechanics and Materials, 2013Co-Authors: Yun Peng Zhang, Wei Shen ZhuAbstract:The distribution of hydraulic pressure in Fractured Rock Mass surrounding caverns after excavation and technique of stochastic generation of joint network are investigated based on discrete element method. In order to seal the oil in underground caverns with water in the actual engineering, a water curtain with water pressure is installed, and the changes of hydraulic pressure are simulated with a series of curtain pressures. It is shown that some joints that have been drained out during excavation can not be saturated if the water curtain pressure is less than a certain value. Water curtain pressure with a certain value gives a strong safe guarantee of saving oil in the underground petroleum storage caverns.
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research on seepage field of underground petroleum storage caverns in Fractured Rock Mass
Advanced Materials Research, 2012Co-Authors: Yun Peng Zhang, Song YuAbstract:Underground seepage discharge field in Fractured Rock Mass surrounding storage caverns is analyzed by using discrete element method and stochastic joint-generation method. Meanwhile water pressure distributions in joints are investigated with a series of curtain pressures and compared with no water curtain. In the case without water curtain the groundwater in joints which locate the upper of underground caverns is drained out and water-seal conditions are completely unrealized. When the water curtain pressure is less than a certain value, the joints that have been drained out can not be saturated, and only the water curtain pressure exceeds this certain value, can groundwater seal the storage caverns.
Hisham T. Eid - One of the best experts on this subject based on the ideXlab platform.
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A technique for estimating permeability of a randomly Fractured Rock Mass
Acta Geotechnica, 2007Co-Authors: Hisham T. EidAbstract:Extensive field and laboratory testing programs were performed to develop a relationship between the permeability of a Fractured limestone and the core recovery values. The studied limestone does not encompass any jointing system but is consistently and randomly Fractured. Nineteen in situ falling head permeability tests were carried out to measure permeability of the Fractured Rock Mass at a representative study area. Analysis of test results has led to the formulation of an empirical equation that estimates the permeability of the Rock Mass in terms of its solid core recovery value and the permeability of the fractures filling material. Unlike the existing equations for estimating the permeability of Rock Masses, the proposed equation is simple and utilizes parameters that can be easily determined in regular geotechnical field and laboratory investigations. A technique is also presented to estimate the permeability of a Rock layer, the quality of which significantly changes with depth, using the proposed equation that utilizes a single value of core recovery. Analysis of well-documented pumping test results supported the validity of the proposed equation and technique.
Jiajun Wang - One of the best experts on this subject based on the ideXlab platform.
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hybrid grey wolf optimization algorithm based support vector machine for groutability prediction of Fractured Rock Mass
Journal of Computing in Civil Engineering, 2019Co-Authors: Shaohui Deng, Xiaoling Wang, Yushan Zhu, Jiajun WangAbstract:AbstractGroutability determination is a very important task in grouting quality control. There is little research on the groutability of cement-based grout in a Fractured Rock Mass, and the predict...
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Hybrid Grey Wolf Optimization Algorithm–Based Support Vector Machine for Groutability Prediction of Fractured Rock Mass
Journal of Computing in Civil Engineering, 2019Co-Authors: Shaohui Deng, Xiaoling Wang, Yushan Zhu, Jiajun WangAbstract:AbstractGroutability determination is a very important task in grouting quality control. There is little research on the groutability of cement-based grout in a Fractured Rock Mass, and the predict...
Yaohui Zhang - One of the best experts on this subject based on the ideXlab platform.
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experimental study on the effect of grouting reinforcement on the shear strength of a Fractured Rock Mass
PLOS ONE, 2019Co-Authors: Cheng Wang, Zuqiang Xiong, Chun Wang, Yaohui ZhangAbstract:To study the strengthening mechanism and effect underlying the reinforcement of a Fractured Rock Mass with grouting, compressive shear tests were conducted with an RMT-150B Rock mechanics test system. Prefabricated structural surfaces were strengthened with a new inorganic dual-liquid grouting material at five water-cement ratios (0.6-1.5). The effects of these water-cement ratios of the grouting on the deformation, strength, and failure characteristics of the prefabricated structural surface were analyzed. The results show that reinforcement with grouting significantly influenced the bearing capacity of the structural surface. The shear strength of the structure was significantly improved and the deformation resistance of the structural surface was enhanced. The shear stress-displacement curves, generated in compressive shear tests of the grouting-reinforced structures, were all nonlinear. The shearing process comprised three stages: elasticity, yield, and failure. Decreasing the water-cement ratio of the grouting material weakened the plasticity of the grouted structural surface and enhanced its brittleness. The deformation type changed from plastic slip to brittle shear. The shear strength, cohesion, and angle of internal friction of the grouting-reinforced structural surface increased with decreasing water-cement ratio.
