ANALYSIS ON MAGNITUDE CHARACTERISTICS OF THE SHALLOW CRUSTAL TECTONIC STRESS FIELD IN QINGHAI-TIBET PLATEAU AND ITS ADJACENT REGION BASED ON IN-SITU STRESS DATA

2017 ◽  
Vol 60 (4) ◽  
pp. 408-420
Author(s):  
YAO Rui ◽  
YANG Shu-Xin ◽  
XIE Fu-Ren ◽  
CUI Xiao-Feng ◽  
LU Yuan-Zhong ◽  
...  
Keyword(s):  
Stress Field ◽  
Tectonic Stress ◽  
In Situ Stress ◽  
Tibet Plateau ◽  
Tectonic Stress Field ◽  
Adjacent Region ◽  
Qinghai Tibet Plateau

Numerical Simulation of Tectonic Stress Field in the Southeast of the Qinghai-Tibet Plateau

2013 ◽  
Vol 864-867 ◽  
pp. 2418-2421
Author(s):  
Li Yang ◽  
Jian Lin Li ◽  
Shi Wei Luo
Keyword(s):  
Numerical Simulation ◽  
Stress Field ◽  
Simulation Analysis ◽  
Tectonic Stress ◽  
Geological Structure ◽  
Tibet Plateau ◽  
Tectonic Stress Field ◽  
Structure Model ◽  
Set Up ◽  
Qinghai Tibet Plateau

The tectonic stress field plays an important role in the research of crustal stability, fault activity and the geological disaster effect. On the basis of related geological data, ANSYS and FLAC3D are applied in this paper to set up a reasonable geological structure model and boundary conditions, aiming at making a numerical simulation analysis of tectonic stress field in the southeast of the Qinghai-Tibet plateau. The result and the measured data fit better, which provides a reference for the further study of the project.

scholarly journals The Influence Mechanism of In Situ Stress State on the Stability of Deep-Buried-Curved Tunnel in Qinghai-Tibet Plateau and Its Adjacent Region

2021 ◽  
Vol 2021 ◽  
pp. 1-18
Author(s):  
Huiqing Wang ◽  
Chengxuan Tan ◽  
Chengjun Feng ◽  
Peng Zhang ◽  
Bangshen Qi ◽  
...  
Keyword(s):  
Stress State ◽  
Pressure Coefficient ◽  
Three Dimensional ◽  
Multivariate Regression Analysis ◽  
In Situ Stress ◽  
Tibet Plateau ◽  
Adjacent Region ◽  
The Stability ◽  
Qinghai Tibet Plateau

In China, rockburst disaster occurs mostly in construction of underground engineering in Qinghai-Tibet Plateau and its adjacent region. Previous research on deep-buried tunnels has indicated that tunnels stability is related to in situ stress state. To quantify these relationships, three-dimensional finite element modeling was done to analyze the influences that the angle φ between the maximum horizontal principal stress orientation and tunnel axis, and the lateral pressure coefficient KH, had on the tangential stress σ θ in a deep-buried-curved tunnel. Based on the in situ stress condition in Qinghai-Tibet Plateau and its adjacent region, 50 different simulation conditions were used to analyze the relationship that φ and KH had on σ θ for the rock mass surrounding the tunnel. With the simulation data produced, predictive equations were generated for σ θ as a function of φ and KH using multivariate regression analysis. These equations help estimate σ θ at various key positons along the tunnel boundary at Qinghai-Tibet plateau and its adjacent region. The equations were then proved by a set of typical tunnels to ensure validity. The results concluded that the change in φ has a significant impact on σ θ , and thus, the stability of the tunnel, when 30° < φ < 60°, with the most obvious influence being when φ is about 45°. With the equations, the rockburst potential at a certain location within a curved tunnel can be quickly estimated by calculating φ and KH on σ θ , without need of geo-stress background knowledge and heavy simulation, allowing for the practical value in engineering at design phase for the projects in Qinghai-Tibet Plateau and its adjacent region.

In-Situ Stress Measurement and Tectonic Stress Field in the Lanzhou-Maqu Region of China

2008 ◽  
Vol 51 (5) ◽  
pp. 1031-1038 ◽  
Author(s):  
Man-Lu WU ◽  
Yin-Sheng MA ◽  
Chun-Shan ZHANG ◽  
Chun-Ting LIAO ◽  
Ming-Yi OU
Keyword(s):  
Stress Field ◽  
Stress Measurement ◽  
Tectonic Stress ◽  
In Situ Stress ◽  
Tectonic Stress Field ◽  
In Situ Stress Measurement

scholarly journals Large Deformation Mechanics of Gob-Side Roadway and Its Controlling Methods in Deep Coal Mining: A Case Study

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Jianwei Zheng ◽  
Wenjun Ju ◽  
Xiaodong Sun ◽  
Zhongwei Li ◽  
Shuai Wang ◽  
...  
Keyword(s):  
Stress Field ◽  
Large Deformation ◽  
Coal Mining ◽  
Tectonic Stress ◽  
In Situ Stress ◽  
Field Analysis ◽  
Underground Mines ◽  
Roof Structure ◽  
Deformation Mechanics

Maintaining surrounding rock mass stability of roadways is essential to the safety of deep coal mining. In this study, the No. 2-2092 roadway of the No. 2-209 mining face in Ganhe coal was taken as the target roadway for field analysis. The selected region can be considered a typical area with dominating geological tectonic stress, based on the geological survey and in situ stress results. A mechanical model of roadway overburdens was developed to analyse the large deformation and stress field distribution. It is found that the large deformation is caused by the combined superposed stress field including laterally transferred stress formed in structures at overlying strata, mining-induced advanced abutment pressure, and the regional in situ stress. Thus, a Two-Direction Hydrofracturing Technique (TDHT) was proposed to reduce the pressure of the No. 2-2092 roadway by altering the roof structure in the influenced zones. Compared with the original roadway without fracturing, it is found that the roof to floor convergence has dropped by nearly 47% after fracturing; the displacement of sidewalls has reduced by almost 31%, demonstrating the effectiveness of the proposed method in pressure relief. Results from this study can provide guidance on controlling the large deformation of roadways in deep underground mines.

Measurement and the Distribution Law of In Situ Stresses of Tingnan Coal Mine

2013 ◽  
Vol 275-277 ◽  
pp. 282-285
Author(s):  
Jiong Wang ◽  
Yang Liu ◽  
Zhi Biao Guo ◽  
Jie Wen Pang ◽  
Bin Liu
Keyword(s):  
Stress Field ◽  
Coal Mine ◽  
Stress Measurement ◽  
Tectonic Stress ◽  
In Situ Stress ◽  
Dominant Factor ◽  
Distribution Law ◽  
In Situ Stress Measurement ◽  
In Situ Stress Field

In order to study the distribution law of in situ stress field of Tingnan coal mine, 4 points of in situ stress measurement were carried out in underground roadways at the -450 m level with the overcoring method. The KX-81 type cell was used to measure the 4 points of in-situ stress. According to the analysis and calculation of the measurement result, the dominant factor of the in situ stress field in Tingnan coal mine at the depth of -450m is horizontal tectonic stress.

The Recent State of Stress in the Central Qinghai-Tibet Plateau according to In-Situ Stress Measurements

2005 ◽  
Vol 48 (2) ◽  
pp. 362-368 ◽  
Author(s):  
Man-Lu WU ◽  
Chun-Shan ZHANG ◽  
Chun-Ting LIAO ◽  
Yin-Sheng MA ◽  
Ming-Yi OU
Keyword(s):  
In Situ Stress ◽  
Tibet Plateau ◽  
Stress Measurements ◽  
State Of Stress ◽  
In Situ Stress Measurements ◽  
Qinghai Tibet Plateau

Measurement and the Distribution Law of In Situ Stresses at Deep Depth of Hongyang Coal Mine

2013 ◽  
Vol 671-674 ◽  
pp. 65-68
Author(s):  
Hong Man Xia ◽  
Jiong Wang ◽  
Yang Liu ◽  
Jie Wen Pang ◽  
Dong Qiao Liu ◽  
...  
Keyword(s):  
Stress Field ◽  
Coal Mine ◽  
Stress Measurement ◽  
Measurement Data ◽  
Tectonic Stress ◽  
In Situ Stress ◽  
Distribution Law ◽  
In Situ Stress Measurement ◽  
In Situ Stress Field

There are many in situ stress measurement methods nowadays, the ISRM suggested two methods for in situ stresses measurement: overcoring methods and the hydraulic fracturing methods. In order to study the distribution law of in situ stress field in the deep position of Hongyang coal mine, 3 points of in situ stress measurement were carried out in underground roadways at the -870 m level adopting the overcoring method. The KX-81 type gauge was used to measure the 3 points of in-situ stress. According to the analysis and calculation of the measurement data, the result showed that the in situ stress field in Hongyang coal mine at the depth of -870m was dominated by horizontal tectonic stress.

Sign in / Sign up

Export Citation Format

Share Document