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

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.

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.

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

2012 ◽  
Vol 450-451 ◽  
pp. 1601-1607 ◽  
Author(s):  
Jiong Wang ◽  
Zhi Biao Guo ◽  
Feng Zhou ◽  
Feng Bin Su ◽  
Bao Liang Li
Keyword(s):  
Stress Field ◽  
Principal Stress ◽  
Coal Mine ◽  
Stress Measurement ◽  
In Situ Stress ◽  
Distribution Law ◽  
Principal Stresses ◽  
In Situ Stress Measurement ◽  
In Situ Stress Field

Many kinds of in situ stress measurement methods are used nowadays, two most common of which are the overcoring and the hydraulic fracturing methods. In order to study the distribution law of in situ stress field in the deep position of Xingcun coal mine, 4 points of in situ stress measurement were carried out in underground roadways at the -1200 m level adopting the overcoring method. The hollow included technique was used to measure the 4 points of in-situ stress. According to the analysis of the measurement data, the results indicated that: (1) Among the three principal stresses on all measurement points, two principal stresses were nearly horizontal and one was nearly vertical. Furthermore, the maximum horizontal principal stress was more than the vertical principal stress, and the magnitude of vertical stress was equal to the weight of overburden rock mass;(2)The value of the maximum horizontal principal stress reached 52.3 MPa , the directions mainly concentrated on the extension of N42°W – N85°W, and the obliquity mainly concentrated on the extension of -29° – 10°;(3)The ratio of maximum horizontal principal stress to vertical principal stress was 1.42 - 1.64 with an average value of 1.55. The result presented that the in situ stress field in Xingcun coalmine at the depth of -1200m was dominated by tectonic horizontal stress. According to the results above, we gained the in situ stress states and the distribution law in the measured region. At the same time, it can offer reasonable basic parameters for underground roadway layout and support design of Xingcun coalmine.

scholarly journals Numerical Simulation of the Stress Field in Repeated Mining of Coal Seams Based on In Situ Stress Measurement

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Donghui Yang ◽  
Bohu Yang ◽  
Zhaoheng Lv ◽  
Yongming Li ◽  
Hongming Cheng ◽  
...  
Keyword(s):  
Rock Mass ◽  
Stress Field ◽  
Stress Measurement ◽  
Initial Conditions ◽  
Main Roof ◽  
Strength Criterion ◽  
Maximum Principal Stress ◽  
In Situ Stress ◽  
In Situ Stress Measurement

We established an evaluation index of the rock mass stress state for underground coal mines using the strength-stress ratio based on the measured in situ stress and the generalized Hoek–Brown strength criterion. Three in situ stress states, σcm/σ1m < 1.4 (high), 1.4 < σcm/σ1m < 3.6 (medium), and σcm/σ1m > 3.6 (low), were established based on the value of the unconfined compressive strength (σcm) and the maximum principal stress of the rock mass (σ1m). This index classifies the Burtai mine as a medium-high in situ stress field, which is in agreement with the on-site situation, establishing the reliability of the index. The working face was a three-dimensional geological model based on the log sheets. The initial conditions for the model were determined using the combined measurements of the in situ stress regression model. We performed numerical simulations of the roof stress field distribution under repeated mining. Mining the overlying coal seam leads to significant variation in the value and direction of the main roof, σ1, within the range of the front abutment pressure under the pillar and gob. Along the main roof strike direction, σ1 under the pillar is 1.5 times that under the gob, and the σ1 direction under the pillar is deflected by 5°, which is 30° smaller than that under the gob. This provides a reference for optimized underground coal mining.

Sign in / Sign up

Export Citation Format

Share Document