IMHE OpenIR  > Journal of Mountain Science  > Journal of Mountain Science-2011  > Vol8 No.2
Prediction research of deformation modulus of weak rock zone under in-situ conditions
Zhang Yong; He JiangDa; Wei Yufeng; Nie Dexin
Corresponding AuthorZhang, Y
2011-04
Source PublicationJOURNAL OF MOUNTAIN SCIENCE
ISSN1672-6316
Volume8Issue:2Pages:345–353
AbstractWeak rock zone (soft interlayer, fault zone and soft rock) is the highlight of large-scale geological engineering research. It is an important boundary for analysis of rock mass stability. Weak rock zone has been formed in a long geological period, and in this period, various rocks have undergone long-term consolidation of geostatic stress and tectonic stress; therefore, under in-situ conditions, their density and modulus of deformation are relatively high. Due to its fragmentary nature, once being exposed to the earth's surface, the structure of weak rock zone will soon be loosened, its density will be reduced, and its modulus of deformation will also be reduced significantly. Generally, weak rock zone can be found in large construction projects, especially in the dam foundation rocks of hydropower stations. These rocks cannot be eliminated completely by excavation. Furthermore, all tests nowadays are carried out after the exposure of weak rock zone, modulus of deformation under in-situ conditions cannot be revealed. In this paper, a test method explored by the authors has been introduced. This method is a whole multilayered medium deformation method. It is unnecessary to eliminate the relatively complete rocks covering on weak rock zone. A theoretical formula to obtain the modulus of deformation in various mediums has also been introduced. On-site comparative trials and indoor deformation modulus tests under equivalent density conditions have been carried out. We adopted several methods for the prediction researches of the deformation modulus of weak rock zone under in-situ conditions, and revealed a fact that under in-situ conditions, the deformation modulus of weak rock zone are several times higher than the test results obtained after the exposure. In a perspective of geological engineering, the research findings have fundamentally changed peoples' concepts on the deformation modulus of weak rock zone, provided important theories and methods for precise definition of deformation modulus of deep weak rock zone under cap rock conditions, as well as for reasonable engineering applications.
KeywordWeak Rock Zone In-situ Conditions: Stress Confining Pressure Deformation Modulus Multilayered
Language英语
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/5822
CollectionJournal of Mountain Science _Journal of Mountain Science-2011_Vol8 No.2
山地灾害与地表过程重点实验室
Recommended Citation
GB/T 7714
Zhang Yong,He JiangDa,Wei Yufeng,et al. Prediction research of deformation modulus of weak rock zone under in-situ conditions[J]. JOURNAL OF MOUNTAIN SCIENCE,2011,8(2):345–353.
APA Zhang Yong,He JiangDa,Wei Yufeng,&Nie Dexin.(2011).Prediction research of deformation modulus of weak rock zone under in-situ conditions.JOURNAL OF MOUNTAIN SCIENCE,8(2),345–353.
MLA Zhang Yong,et al."Prediction research of deformation modulus of weak rock zone under in-situ conditions".JOURNAL OF MOUNTAIN SCIENCE 8.2(2011):345–353.
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