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Tunnel mechanical parameters estimates and applied research

Author: FengLiZhi
Tutor: SuYongHua
School: Hunan University
Course: Geotechnical Engineering
Keywords: Rock parameter estimation Geological Strength Index Integrity coefficient Roughness coefficient Block index Weathering index Hawke - Brown criterion
CLC: U451.2
Type: Master's thesis
Year: 2009
Downloads: 256
Quote: 7
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Abstract


Rock mechanics parameters that affect the tunnel engineering design, construction, safety, cost is one of the main factors and key indicators. Stability analysis in the tunnel, and how relatively reasonable estimate rock mechanics parameters for tunnel engineering design and construction, as well as accurately estimate tunnel deformation and stability is very important. In this paper, the use of tracking Hoek-Brown criterion rock mechanical parameters of rock mechanics parameter estimation methods adopted and the progress made on the basis of various improvement measures, pointing out that the creation of the latest methods Hoek - Geological Strength Index (GSI) method entirely dependent on qualitative descriptions and lack of personal subjective experience, decided to reveal the internal factors of geological strength index is type of rock structure, external factors are rock weathering conditions. From the macroscopic and microscopic characteristics of the rock mass departure of the two factors were described quantitatively, to compensate for the lack of GSI index method. Macroscopic characteristics of the rock mass based on the study, namely the introduction of testing techniques based on elastic wave rock integrity coefficient Kv and based on rock surface roughness roughness coefficient JRC, the rock structure type and degree of weathering quantitative description established macroscopic characteristics GSI indicators based on rock quantitative form. Limited to the lack of macro-quantitative, so microscopic characteristics of the rock mass, based on the introduction of drill core based on a full-length rock blocks of different indices to quantitatively characterize the rock structure; analysis in the chemical weathering of rocks is the primary mineral hydrolysis, leaching of mineral alteration caused by lithology promote the process of change, and so made a quantitative characterization of rock weathering status indicators - absolutely rock weathering index, also studied the launch of its calculation. The rock block index, absolute weathering index interval in geological strength index on the table range generalizability combine to form a microscopic characteristics of GSI based on rock quantitative method for determining indicator tables. Using this method to estimate a highway tunnel surrounding rock deformation modulus, tensile, compressive and shear strength and other mechanical parameters and calculate the collapse arch height. Compared with the measured data, the maximum error at around 14%, to verify the effectiveness and practicality. Finally, the sun and to the Yellow Dragon Cave in Zhangjiajie highway tunnel construction site pears Ping monitoring data as the basis to establish the tunnel section excavation ANSYS model for excavation simulation, and the results were compared with the measured proved the effectiveness of this improvement and rational sex.

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CLC: > Transportation > Road transport > Tunnel project > Tunnel structure theory > Theory of tunnel surrounding rock
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