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检索条件"任意字段=Rock Characterisation,Modelling and Engineering Design Methods——The 3rd ISRM SINOROCK Symposium"

共 307 条记录，以下是31-40 订阅

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Study on the rule of roof moment and surface subsidence about shallow-buried coal seam under thin base rock

引用

3rd International-Society-for-rock-Mechanics (isrm) sinorock symposium

作者： Wu, Baoyang Ouyang, Zhenhua China Coal Res Inst Inst Coal Safety & Technol Beijing Peoples R China China Coal Res Inst State Key Lab Coal Mining & Clean Utilizat Beijing Peoples R China

ISBN: (纸本)9781138000575

As the engineering background of the shallow-buried coal seam under thin base rock in western coal mine, using two dimension discrete element numerical analysis software UDEC, the exploitation process of working facewas simulated, the rule, which including roof movement has some abruptness and interconnectivity, surface subsidence exhibits fault zone as zigzag n surface, was summarized and analyzed, and was found to be in agreement with the reality. On this basis, some secondary disaster and loss were effectively avoided by adoption of a series of technical measures, some foundation was provided for seam mining under the similar condition.

关键词： Coal mines

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Modeling of rockfalls using the lumped mass method and DDA

引用

3rd International-Society-for-rock-Mechanics (isrm) sinorock symposium

作者： Ku, Cheng-Yu Natl Taiwan Ocean Univ Dept Harbor & River Engn Keelung Taiwan

ISBN: (纸本)9781138000575

This paper presents the modeling of rockfalls using the lumped mass method and the DDA method. In the lumped mass method, the block is treated as a lumped mass which neglects the three-dimensional aspects of the block such as the block shape and the subsequent block orientation at the instant of impact on the slope. On the contrary, the DDA method for rigid blocks, which is a two-dimensional deterministic discrete element analysis, is adopted to study the rockfall problem if it is of importance to investigate the effects from the shape and size effects of the falling rock. Results obtained demonstrate that the proposed method with the combination of using the lumped mass method and the DDA method can greatly increase the reliability of predicting rockfall trajectories using the high resolution DEM and exhibit great potential for practical applications in the future.

关键词： rock bursts

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Application of photoelectric sensors to rock slopes for rock fall monitoring

引用

3rd International-Society-for-rock-Mechanics (isrm) sinorock symposium

作者： Song, W. K. Jung, Y. B. Korea Inst Geosci & Mineral Resources Taejon South Korea

ISBN: (纸本)9781138000575

Conventional equipments for rock fall monitoring require a repair of the system after detection of rock fall events since falling rocks give them damage. To overcome such shortcoming, a new system using photoelectric sensors was developed in this study. This technique allows the system to be functioned without any repair since the sensors can detect a rock fall without any contact with rock. Reliability of this system was checked out through various tests both in a laboratory and in a field. The test results showed that the system was effectively applicable to detecting rock fall events and useful for gathering and analyzing various technical data. It is also capable for roughly estimating the size or moving direction of rocks through comparing digital images captured by a camera.

关键词： Repair

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The design and main construction technology of super-small-interval tunnels

引用

3rd International-Society-for-rock-Mechanics (isrm) sinorock symposium

作者： Zhong, Shihang China Acad Railway Sci Beijing Peoples R China

ISBN: (纸本)9781138000575

Parallel tunnels with super-small-interval means that the interval of two parallel tunnels is between 1/2-1/3 tunnel span. Its stress condition of surround rock is more disadvantageous compare with the tunnels normal and small-interval tunnel during the tunnels with super-small-interval is excavated, and the excavated tunnel and the rock pillar between two tunnels are easy to be destroyed, so special design and construction requirement are asked. But its cost is only half of multi-arch tunnel, excavation method is simpler and construction period is shorter, moreover, it can reduce the width of highway in mountain area and the cost of higher class road greatly. The precise exploration before design and numerical simulation during design must be done to make sure the main danger which is easy to be destroyed, the reinforcement methods and the construction order. Taking advantage of self-supporting ability of surround rock fully is the design idea, so the rock pillar between two tunnels is the most important reinforcement place. Controlled blasting is another key. The ZhaoBaoShan tunnel locating in Zhenhai, Ningbo, Zhejiang, is a typical instance, which is a good book to show the design idea and construction technology.

关键词： Tunnels

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A new method to determine shearing strength for limestone - a case study on Longshan Quarry of Anning City in Yunnan

引用

3rd International-Society-for-rock-Mechanics (isrm) sinorock symposium

作者： Xu, Shiguang Wang, Jianguo Li, Chenchen Kunming Univ Sci & Technol Kunming Peoples R China

ISBN: (纸本)9781138000575

Thirty six slopes, which are constituted by limestone, in Longshan Quarry of Anning City have been studied in order to get a new method to determine the shearing strength for limestone. Through comparison the parameter error between the site shearing test and the calculated value that is based on the slope stability, the later has been employed as the substitute of the former to increase the specimen so as to reveal the relationship between the angle of shearing resistance of the rock and the fissuring assembly on the slope together with the coefficient of rock integrity. When the regression analysis is employed, the basic regularity is turned out, which shows the angle of shearing resistance of the rock mass can be determined by the angle of shearing resistance of the rock experimented in laboratory through a discount with the coefficient of its rock integrity.

关键词： Case studies rock joints rock mass classfication Stability analysis

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Analytical solution for N-member decay chain transport in fracture in rock

引用

3rd International-Society-for-rock-Mechanics (isrm) sinorock symposium

作者： Shahkarami, P. Liu, L. Moreno, L. Neretnieks, I. Royal Inst Technol Dept Chem Engn & Technol Stockholm Sweden

ISBN: (纸本)9781138000575

A model is developed to describe the transport of an N-member radionuclide decay chain along a discrete fracture situated in a porous matrix. An analytical solution is presented and a series of simulations are performed to study the relative significance of diffusion process into rock matrix, stagnant water, chain decay and hydrodynamic dispersion. The results show that a simplified model that ignores the effect of stagnant water zone can lead to significant error in the estimated time of arrival and peak value of the nuclides. The results demonstrate that for a two-member decay chain, neglecting the parent and modeling its daughter as a single species can result in significant overestimation of peak value of the nuclide. Moreover, it is found that as the dispersion increases, the arrival time and peak time of daughter decrease, while the peak value increases.

关键词： Isotopes

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Three-dimensional thermomechanical modelling of high-level waste emplacement in a salt dome

引用

3rd International-Society-for-rock-Mechanics (isrm) sinorock symposium

作者： Heusermann, S. Eickemeier, R. Nipp, H. -K. Fahland, S. Fed Inst Geosci & Nat Resources BGR Hannover Germany

ISBN: (纸本)9781138000575

Geoscientific investigations at the Gorleben salt dome have been conducted to prove its suitability as a repository for high-level radioactive waste. Part of the investigation is the geotechnical safety analysis to assess the integrity of the geological barrier under thermal loading caused by heat-generating wastes. To this end, the geological structure of the rock, as well as appropriate constitutive material models must be taken into account to analyse the long-term deformation and dilatancy of the rock salt. The paper describes two numerical 3-D models of the emplacement of wastes. The first model deals with the emplacement in drifts located at the 860-m level. The second model considers the borehole disposal concept involving the emplacement of waste canisters in vertical boreholes. The calculations were performed for a time period of 10,000 years. The calculated stresses are used to evaluate the integrity of the salt barrier. For this purpose, the dilatancy criterion and the hydraulic criterion are considered.

关键词： Boreholes

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Method to simulating cracking of surrounding rock in coal mines

引用

3rd International-Society-for-rock-Mechanics (isrm) sinorock symposium

作者： Xue, Yuting Liu, Quansheng Lu, Xingli Chinese Acad Sci State Key Lab Geomech & Geotech Engn Inst Rock & Soil Mech Wuhan Hubei Peoples R China

ISBN: (纸本)9781138000575

Due to the stress redistribution after excavation, the pre-existent joints or cracks will deform and new cracks will initiate and propagate in surrounding rock, especially in the plastic zone. And differences, once cracks initiate and propagate in a certain area, exist when the equivalent continuum mechanics and non-continuum mechanics are used to analyze its mechanical response. A method is proposed in this paper to approximately simulate continuum before cracking and to change the potential joints to joints after cracking beginning which can approximately take the effects of cracking into consideration. And this method is explained, in detail, from its computation procedure, the determination of initial material parameters, the distribution of potential cracks and the failure criteria for the real and potential joints. Finally, two sets of numerical analyses are made to verify its effectiveness in approximately simulating continuum and the cracking process.

关键词： Cracks

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Study of rock bursts prevention based on rapid stress release in deep buried underground tunnels

引用

3rd International-Society-for-rock-Mechanics (isrm) sinorock symposium

作者： Wang, Yang Yin, Jianmin Zhou, Chunhua Minist Water Resources Changjiang River Sci Res Inst Key Lab Geotech Mech & Engn Wuhan Hubei Peoples R China

ISBN: (纸本)9781138000575

rock burst is one of the most serious geologic hazards, adversely affecting the safety, economy and productivity of underground engineering construction. High ground stress and its induced frequent rock bursts are major influences of tunnel instability during the survey and design and construction stages. As a major construction of the Jinping II Hydro-power Station on the Yalongjiang River, the deep-buried water transfer tunnels face the problems of rock bursts in hard rock under high geostress. According to the characteristic of the rock bursts in Jinping II Hydro-power Station, the method of preventing the rock burst by rapid stress releasing was put forward, and the scheme of stress releasing hole was selected through numerical simulation by using FLAC (Fast Lagrangian Analysis of Continua) 3D explicit finite-difference software. Through the testing and application in water transfer tunnels of Jinping II Hydro-power Station, the rapid stress release method by blasting has proven to be an effective method for preventing and treating rock burst.

关键词： rock bursts

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Theoretical analysis on electromagnetic emission of rock fracturing process

引用

3rd International-Society-for-rock-Mechanics (isrm) sinorock symposium

作者： Lin, P. Liu, X. L. Kang, S. Z. Wang, C. Tsinghua Univ State Key Lab Hydrosci & Engn Beijing 100084 Peoples R China

ISBN: (纸本)9781138000575

It is significant to study electromagnetic emission of tensile cracking in rock for seismic science and rock mechanics. The electromagnetic emission during single crack propagation of 2-D rock test specimen is studied. A model to describe the electromagnetic emission during propagation process of single crack is proposed. Hertz array is introduced along the crack surface in this model. The distribution law of electromagnetic field is detected during the rock fracturing process. When ignoring the effect of phase difference, the electromagnetic field during the crack propagation is the spatial overlay of radiation by Hertz oscillators along the fracturing surface. The electromagnetic field created by Hertzian array may be one small part of the actual field. The issue discussed above is complex, systematically and microcosmically study should be done to describe the electromagnetic emission properties of rock material.

关键词： Electromagnetic fields

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