In Situ Tests on Creep Behavior of Rock Mass with Joint or Shearing Zone in Foundation of Large-Scale Hydroelectric Projects

2004 ◽  
Vol 261-263 ◽  
pp. 1097-1102 ◽  
Author(s):  
Jian Liu ◽  
Xia Ting Feng ◽  
Xiu Li Ding ◽  
Huo Ming Zhou
Keyword(s):  
Rock Mass ◽  
Creep Behavior ◽  
Large Scale ◽  
Time Dependent ◽  
Three Gorges Project ◽  
Three Gorges ◽  
The Three Gorges ◽  
The Three Gorges Project

The time-dependent behavior of rock mass, which is generally governed by joints and shearing zones, is of great significance for engineering design and prediction of long-term deformation and stability. In situ creep test is a more effective method than laboratory test in characterizing the creep behavior of rock mass with joint or shearing zone due to the complexity of field conditions. A series of in situ creep tests on granite with joint at the shiplock area of the Three-Gorges Project and basalt with shearing zone at the right abutment of the Xiluodu Project were performed in this study. Based on the test results, the stress-displacement-time responses of the joints and basalt are analyzed, and their time-dependent constitutive model and model coefficients are given, which is crucial for the design to prevent the creep deformations of rock masses from causing the failure of the operation of the shiplock gate at the Three-Gorges Project and long-term stability of the Xiluodu arc dam.

scholarly journals Characterization of the disturbed zone in a large rock excavation for the Three Gorges Project

2001 ◽  
Vol 38 (1) ◽  
pp. 95-106 ◽  
Author(s):  
J H Deng ◽  
C F Lee ◽  
X R Ge
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Rock Mass ◽  
Elastic Modulus ◽  
Three Gorges Project ◽  
Three Gorges ◽  
The Three Gorges ◽  
Disturbed Zone ◽  
The Three Gorges Project ◽  
Element Method

Excavation in a rock mass leads to the perturbation of the stress regime, often creating a stress-relieved, locally weakened zone known as the disturbed zone. This paper presents the results of in situ studies that were carried out both in the central rock barrier (or separation block) between the shiplift and the temporary shiplock and in the northern slope of the permanent shiplock of the Three Gorges Project. The vertical extent of the disturbed zone was determined jointly by cross-hole seismic wave penetration testing and borehole elastic modulus testing, and the horizontal extent was assessed by monitoring and evaluating the deformation characteristics. Compared with the undisturbed rock mass, the P-wave velocity of the disturbed zone was reduced by 34–38% and the borehole elastic modulus by 12–31%. The reductions were caused by the opening of primary structural planes or the extension of apertures due to local sliding along the structural planes. In the disturbed zone, no newly formed fractured planes were found. The observed disturbed zone was compared with the tensile stress zones and the shear-damaged zones calculated by the finite element method. A rock reinforcement scheme was recommended and implemented.Key words: disturbed zone, mechanical properties, brittle rock mass, excavation, finite element method, reinforcement.

Experimental Research on Gravel Soil Shear Strength

2014 ◽  
Vol 716-717 ◽  
pp. 383-386
Author(s):  
Wei Fu Teng ◽  
Wei Wang
Keyword(s):  
Shear Strength ◽  
Large Scale ◽  
Three Gorges Project ◽  
Three Gorges ◽  
Strength Parameters ◽  
The Three Gorges ◽  
Gravel Soil ◽  
The Three Gorges Project ◽  
Moisture Conditions ◽  
Coarse Soil

With the rise in the water level of the Three Gorges Project, accurately measuring the shear strength parameters of the Three Gorges Project shore landslide has important implications for the safety of the Three Gorges Project’s surrounding area. Due to the material of reservoir area slope is complex, are mostly loose accumulation, these loose accumulation are mainly composed by landslide deposits, eluvia material, alluvial matter, landslides, strong weathered, and material composition is soil with gravel or fragments stone, the conventional small specimens test has been impossible. Badong County has long rainy season, abundant rainfall, mudslides, landslides and other geological disasters are frequent, so measuring reservoir landslide shear strength of Badong County is particularly important. Therefore, this paper takes the gravel soil of piled crushed landslide of the third senior middle school in Badong County as the research object, through lab large-scale direct shear test to research the gravel soil strength parameters’ variation of the soil samples with different coarse soil content under different moisture conditions.

scholarly journals Engineering geological assessment of the permanent ship lock slope, the Three Gorges Project, China

2000 ◽  
Vol 22 ◽  
Author(s):  
Chen Changyan ◽  
Wang Sijing ◽  
Shen Xiaoke
Keyword(s):  
Rock Mass ◽  
Field Investigation ◽  
Three Gorges Project ◽  
Three Gorges ◽  
Element Analysis ◽  
Rock Mass Structure ◽  
The Three Gorges ◽  
Rock Mass Quality ◽  
The Three Gorges Project ◽  
Ship Lock

The permanent ship lock slope of the Three Gorges Project was excavated through the hill of granite massif with the aspect of SE(106°). Some problems of engineering geology (such as statistical features of rock mass structure) were comprehensively studied based on field investigation and numerical analysis. The numerical modelling techniques including damage variable and finite element analysis were used for the detailed study of the effect of excavation and blasting on rock mass quality and slope stability. The analyses indicate that the rock mass is relatively intact and rock mass quality varies mainly from Class I to Class II. Consequently, the overall stability of slope can be ensured except for some minor local unstable blocks.

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