Application of GPS-RTK Technology in the Measurement of Discontinuity Traces

Rock discontinuities appear as traces on exposures such as natural outcrops or tunnel walls. Discontinuity size which has important effects on rock mass behavior such as rock mass strength, deformability, stability, fluid flow, contaminant transport is related to trace length. Field linear and areal sampling techniques are time-consuming and low accuracy. Real-Time Kinematic GPS (GPS-RTK) developed from GPS is a more secure and fast way, which has some advantages of shorter observation time, high positioning accuracy, unnecessary intervisible and direct result of exact coordinate in field. This paper uses GPS-RTK technology in the measurement of discontinuity traces in Beishan granite rock mass of Gansu province. Through analyzing the processing and results acquired from Beishan granite rock mass discontinuity traces, the paper tries to demonstrate the feasibility and practicality of the method.

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The Research on Mean Spacing of Rock Fracture

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.580-583.219 ◽

2014 ◽

Vol 580-583 ◽

pp. 219-223

Author(s):

Lu Jiang ◽

Yang Song Zhang

Keyword(s):

Rock Mass ◽

Linear Density ◽

Rock Fracture ◽

Three Dimensional ◽

Gansu Province ◽

Dimensional Model ◽

Three Dimensional Model ◽

Gps Rtk ◽

Mass Classification ◽

The Mean

The mean spacing of rock fracture is a very important parameter base to evaluate rock mass,a number of rock studies base on it. Object of this paper is Beishan preselected area in Gansu Province, China. A uthor use GPS-RTK to measure the fracture’s endpoints and inflection, then process the resulting coordinate, building a three-dimensional model of rock fracture by using three-dimensional software and meshing the three-dimensional model, Through the analysis of fractures in each grid to calculate the linear density of rock fracture, after the orientation and inclination correction on linear density, it can be converted to an mean spacing of rock fractures. The mean spacing of rock fracture can be directly used for rock mass classification in GSI rock systems, and has a great significance in rock engineering studies.

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Back analysis of rock mass behavior of the Quintner Limestone at the Gonzen mine near Sargans, Switzerland

Rock Mechanics for Resources, Energy and Environment ◽

10.1201/b15683-78 ◽

2013 ◽

pp. 473-478 ◽

Cited By ~ 1

Author(s):

M Perras ◽

E Ghazvinian ◽

M Diederichs ◽

F Amann ◽

H Wannenmacher

Keyword(s):

Rock Mass ◽

Back Analysis ◽

Mass Behavior

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Ventilation Method Assessment of the Average Permeability of the Fractured Granite Rock Mass around Tunnel

Proceedings of the 5th International Conference on Information Engineering for Mechanics and Materials ◽

10.2991/icimm-15.2015.89 ◽

2015 ◽

Author(s):

Shuguang Wang ◽

Jincai Zhu ◽

Jinchao Yang ◽

Jianhua Chen ◽

Wei Yang

Keyword(s):

Rock Mass ◽

Granite Rock ◽

Fractured Granite ◽

Ventilation Method

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Rock Mass Behavior under Tunnel Widening in Asymmetric and Symmetric Modes Considering Different Shapes and Parametric Conditions

Geosciences ◽

10.3390/geosciences9120518 ◽

2019 ◽

Vol 9 (12) ◽

pp. 518

Author(s):

Babar Khan ◽

Syed Muhammad Jamil ◽

Jung Joo Kim ◽

Turab H. Jafri ◽

Jonguk Kim

Keyword(s):

Rock Mass ◽

In Situ Stress ◽

Design Parameters ◽

Tunnel Widening ◽

Tunnel Support ◽

Mass Behavior ◽

Rock Types ◽

The Difference ◽

Support Conditions

To accommodate traffic volume on roads due to ever-increasing population growth, the widening of highways and motorways is in high demand. Nevertheless, the widening of tunnels on these road networks is quite complex due to the presence of numerous rock types, in situ stress, and different widening modes. To overcome these complexities, eight different tunnel shapes were simulated under varying support conditions for asymmetric and symmetric widening. It was found that the tunnels with a round shape, such as horseshoe and semicircular with flatbed, are more effective for asymmetric widening, whereas the provision of a rounded invert in these shapes can reverse the widening option to symmetric. Furthermore, an insignificant effect of the difference in asymmetric and symmetric widening of regular tunnel shapes, such as box, rectangular, and semi-elliptical, was found. A full factorial design statistical analysis confirmed the decrease in tunnel deformation by using various tunnel support systems and showed a significant deformation difference according to monitoring locations at the tunnel periphery. The deformation difference in the case of both tunnel widening modes was also analyzed according to different design parameters. This study provides a comprehensive understanding of rock mass behavior when the widening of any underground opening is carried out.

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Multilevel Collapsibility of Loess under Irrigation in Jinya Town, Gansu Province, China

Advances in Civil Engineering ◽

10.1155/2019/2153679 ◽

2019 ◽

Vol 2019 ◽

pp. 1-13 ◽

Cited By ~ 1

Author(s):

Xiaozhou Zhang ◽

Yudong Lu ◽

Xin Li ◽

Yangchun Lu ◽

Jianzhong Sun ◽

...

Keyword(s):

Large Scale ◽

Engineering Geology ◽

Observation Time ◽

Gansu Province ◽

The Loess Plateau ◽

Infiltration Process ◽

Continuous Irrigation ◽

Two Peaks

The collapsibility of loess has constantly been a major problem in engineering geology. The determination of the collapsibility process and characteristics of loess are crucial to foundation construction and residents’ life in the Loess Plateau. Thus, a large-scale in situ irrigation collapse experiment was conducted on a 10 m2 test pit. A total of 79 benchmarks are used in this experiment. These benchmarks are divided into three categories, namely, deep-buried steel pipe benchmarks, ground benchmarks inside the pit, and ground benchmarks outside the pit. The irrigation and observation time spanned 40 days. In the entire irrigation experiment, a three-day water suspension period resulted in two peaks on the collapsibility velocity curve, thereby showing a remarkable difference in the collapsibility curve from the standard one. In terms of the microstructural deformation types of loess and infiltration process of irrigation water, we found that the collapsibility of loess is a dynamic process apart from being particularly sensitive to water. That is, even after a full collapse of the irrigation process, new pores will eventually form once the water content in the loess begins to decline, thereby providing conditions for another loess collapse. Therefore, multilevel collapsibility can occur during continuous irrigation, which is a problem that has been unexplored in previous applications.

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