Research on Preparation of Jointed Rock Mass Samples in Site

2011 ◽  
Vol 90-93 ◽  
pp. 593-596
Author(s):  
Yong Liu ◽  
Chun Sheng Qiao
Keyword(s):  
Rock Mass ◽  
Input Parameter ◽  
Deformation Modulus ◽  
Field Tests ◽  
Jointed Rock ◽  
Jointed Rock Mass ◽  
Isotropic Rock ◽  
Important Input ◽  
Cementing Material

The intensity and deformation characterization of a rock mass is an important input parameter in any analysis of rock mass behavior. Field tests to determine this parameter directly are time consuming, expensive and the reliability of the results of these tests is sometimes questionable. Consequently, several authors have proposed empirical relationships for estimating the value of an isotropic rock mass deformation modulus on the basis of classification schemes. But the result is different by different people. Therefore, A new approaches to the mechanical characterization of jointed rock masses has been studied based on the test of little rock mass sample. But preparation of jointed rock mass samples in site is very difficult. In this paper, a method for collecting, preparing and describing samples with extremely to very closely spaced fractures is described where no cementing material is required.

Characterization of a jointed rock mass based on fractal geometry theory

2019 ◽  
Vol 78 (8) ◽  
pp. 6101-6110 ◽  
Author(s):  
Lichen Li ◽  
Wenbing Wu ◽  
M. Hesham El Naggar ◽  
Guoxiong Mei ◽  
Rongzhu Liang
Keyword(s):  
Rock Mass ◽  
Fractal Geometry ◽  
Jointed Rock ◽  
Jointed Rock Mass

Experimental Study of Mechanical Properties of Rock Mass Containing Intermittent Joints of Prefabricated

2010 ◽  
Vol 168-170 ◽  
pp. 2468-2472 ◽  
Author(s):  
Rui Hong Wang ◽  
Jian Lin Li ◽  
Jing Guo ◽  
Yu Zhou Jiang ◽  
Li Dang
Keyword(s):  
Mechanical Properties ◽  
Rock Mass ◽  
Ultimate Strength ◽  
Deformation Modulus ◽  
Strain Curve ◽  
Jointed Rock ◽  
Jointed Rock Mass ◽  
Intact Rock ◽  
Rock Masses ◽  
Intact Rock Mass

Most of the engineering rock masses contain a variety of different levels of geological tectonic joints and weak planes, which can weaken the rock strength. The rock masses containing joints have completely different mechanical properties with the intact ones. Through loading failure tests on the rock masses containing two intermittent joints of prefabricated of different spacing, the differences between jointed rock mass and intact one were studied. The research shows that: 1. Comparing with the intact rock mass, the stress-strain curve of jointed one has a relatively large fluctuation near the peak, it isn’t smooth, and there's a reduction in the stage of plastic flow after yielding; ultimate strength decreases obviously, joint depth has a great impact on strength, and there's no necessary link between ultimate strength of rock mass and joints spacing. 2. When the loading is failure, the elastic and deformation modulus of rock mass decrease obviously comparing with those of the intact rock mass, which tend small generally with the increment of joints spacing, however, they have a relatively complex relation and it isn't linear. 3. The failure characteristics of jointed rock mass are different from those of the intact rock mass, failure planes are relatively complex and no longer single shear or complementary shear ones, which presents that shear failures occur along the end of prefabricated joints with few extensional cracks; the spacing of prefabricated joints have a great impact on the failure pattern of rock mass. The research results can provide certain references for the mechanical parameters selection of jointed rock mass of engineering design and numerical analysis.

Numerical Research on Anisotropy Mechanical Parameters of Fractured Rock Mass

2012 ◽  
Vol 524-527 ◽  
pp. 310-316 ◽  
Author(s):  
Pei Feng Sun ◽  
Tian Hong Yang ◽  
Qing Lei Yu ◽  
Wei Shen
Keyword(s):  
Rock Mass ◽  
Elastic Modulus ◽  
Scale Effects ◽  
Fractured Rock ◽  
Deformation Modulus ◽  
Reference Value ◽  
Fracture Network ◽  
Jointed Rock ◽  
Jointed Rock Mass ◽  
Mechanical Parameters

With ShapeMetriX3D rock non-contact measuring technology, structural planes’ distribution of MiaoGou iron mine slope is got. Then, the Mont-Carlo method is used to create equivalent fracture network, with that scale effects and anisotropic properties of rock mass are studied by RFPA2D, considering different scales and directions in statistical window. The results show that both deformation modulus and the strength of the rock mass’s REV are 2.5 m. Furthermore, the strength ratio of filler to rock (K) and the strength of the rock mass fit the logarithmic relationship in rough, while the elastic modulus ratio of filler to rock (M) and the strength of the rock mass fit the linear relationship in rough. The strength of no joints rock mass is much stronger than three times of the strength of jointed rock mass, but the rock mass elastic modulus of no joints is less than 1.6 times of the elastic modulus of jointed rock mass. The research results are directive and have reference value for the study of anisotropy mechanical parameters of rock mass engineering.

Sign in / Sign up

Export Citation Format

Share Document