Formulation and verification of 3D in-situ stress estimation based on differential-direction drilling

Lin, Cui; Zou, Dexuan

doi:10.1016/j.ijrmms.2021.104833

Cited by 11 publications

(3 citation statements)

References 9 publications

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“…Most of the techniques used to measure initial stress are also applicable to disturbance stress measurement [11,12]. Among these methods, the stress relief method is unique in its ability to continuously monitor three-dimensional stress changes [13]. It relies on linear elasticity theory and allows for the measurement of absolute stress or stress changes, depending on the specific application [14,15].…”

Section: Introductionmentioning

confidence: 99%

The Performance Analysis of Grouting Repair Effect on the Accuracy of Disturbance Stress Test in Damaged Surrounding Rock Mass

Zheng,

Li,

et al. 2024

Materials

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Disturbance stress assessment is crucial for ensuring the safety of deep engineering projects. Currently, the primary technique for continuously monitoring three-dimensional disturbance stress is the stress relief method, but its accuracy can be compromised by rock damage that occurs after excavation. To mitigate this issue, grouting is employed to repair damaged rock masses and enhance their mechanical properties. However, the impact of grouting techniques on improving the accuracy of disturbance stress testing is challenging to evaluate through laboratory and in situ experiments. To address this problem, numerical simulation technology is employed to investigate disturbance stress testing after the repair of damaged surrounding rock through grouting. The simulation results indicate that grouting repair significantly enhances the accuracy of stress testing. As the depth of damaged rock mass repair increases, the error in stress testing decreases. Achieving complete repair of the initial damage zone during grouting is essential to eliminate errors in stress testing. Expanding on the positive effects of grouting repair on stress testing, a segmented testing method for disturbance stress is proposed. The method involves separately testing the initial stress and stress changes, thereby reducing the stress level within the rock, minimizing rock failure, and enhancing the accuracy of disturbance stress testing. This study provides valuable reference methods, and the outcomes of this research will serve as a foundation for enhancing the accuracy of disturbance stress testing in deep hard rock engineering.

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Section: Introductionmentioning

confidence: 99%

The Performance Analysis of Grouting Repair Effect on the Accuracy of Disturbance Stress Test in Damaged Surrounding Rock Mass

Zheng,

Li,

et al. 2024

Materials

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“…Among the above‐mentioned in situ stress testing methods, over‐coring is a method that can measure the complete three‐dimensional (3D) stress at a specific location of the project (Fairhurst, 2003; Vreede, 1981). Other methods usually only provide partial information on the 3D in situ stress, such as the maximum and minimum principal stresses in the plane normal to the drilled hole (Lin & Zou, 2021). The methods of hydraulic fracturing and over‐coring are time‐ and cost consuming, thus not suitable to be used on a large scale in engineering.…”

Section: Introductionmentioning

confidence: 99%

Research on in situ stress inversion of deep‐buried tunnel based on pressure/tension axis mechanism and geological structure

Chen

Liu

Song

2023

Deep Underground Science and Engineering

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The investigation of the in situ stress distribution has always been a key condition for engineering design of deep tunnels and analysis of surrounding rock stability. In this paper, a comprehensive judgment method coupled with pressure/tension (P/T) axis mechanism and geological structure is proposed to invert the in situ stress in the Duoxiongla tunnel in Tibet. In the process of TBM tunnel excavation, 3887 groups of microseismic events were collected by means of microseismic monitoring technology. By studying the temporal and spatial distribution of 3887 groups of microseismic events, 42 groups of microseismic data were selected for in situ stress inversion. Then the focal mechanisms of 42 groups of microseisms were inverted. Combined with the analysis of the previous geological survey, the inversion results of the in situ stress were analyzed. According to the focal mechanism of the tunnel area, the linear in situ stress inversion method was used to invert the in situ stress in the source area. Finally, according to the PTGS (pressure/tension axis mechanism and geological structure) comprehensive judgment method proposed in this paper, the in situ stress of the tunnel microseismic region was determined. The results show that there are mainly three groups of fissures and joint surfaces in the tunnel area, and the in situ stress is dominated by the horizontal tectonic stress; the main driving force of the rupture surface in the excavation process of Duoxiongla tunnel is the horizontal tectonic stress; the distribution of the maximum and minimum principal stress obtained by the inversion is consistent with the distribution of the P/T axis; combined with the linear in situ stress inversion method and the comprehensive judgment of PTGS, the azimuth and dip angles of the three principal stresses are finally determined as N90.71°E, 4.06°, N5.35°W, 3.06°, and N8.10W, 85.32°, respectively. The study verifies the feasibility of microseismic inversion of in situ stress.

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“…In the design and construction of the excavation of rock masses, two types of in situ stress information are essential: the first is the absolute stress (i.e., the initial original stress state of rock), which is the natural stress existing in the stratum before the excavation of the rock (Hayashi et al, 1997;Xu et al, 2021;Li et al, 2022;Liu et al, 2022); the second is the induced stress of the rock, which is the change in the stress of the surrounding rock during and after excavation (Huang et al, 2014;Lin and Zou, 2021;Chen, 2022;Yuan et al, 2022). At present, the measurement techniques for absolute stress are relatively mature, but there is still a lack of techniques for induced stress.…”

Section: Introductionmentioning

confidence: 99%

Modification of the CSIRO method in the long-term monitoring of slope-induced stress

Jin

Li²,

Li³

et al. 2022

Front. Earth Sci.

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The in situ stress measurement technique can be used in long-term monitoring of induced stress to obtain three-dimensional stress states in slope engineering. In the monitoring, the ambient temperature fluctuation, “zero” drift of the logging data, and stable power supply should be considered. A dual temperature compensation circuit and experimental calibration techniques are proposed to increase accuracy based on the principle of the CSIRO method and considering the effect of a long-term disturbance of temperature in slope engineering. In view of the characteristics of the stress field distribution of the slope rock, the strain gauge layout scheme for induced stress monitoring of slope rock is modified to achieve the acquisition of three parallel measurements at one measurement and a stress–strain relationship equation for multilayer elastic layers is derived. An in situ stress logging system with the function of transient logging and data-connection in power cut condition is introduced to achieve a continuous correlation of measurement data under power cut conditions. An online cloud platform is established for the slope engineering of Au Mountain Iron Mine in Maanshan City. The results show that the data deviation of logging system is ±14 με with 24 days’ power off, and errors with amount of 15% were corrected by the dual temperature compensation method. The remotely transmitted data reflect the effect of temperature changes and the evolution of strain (induced stress) in real time to satisfy the demand of long-term monitoring of slope engineering.

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Formulation and verification of 3D in-situ stress estimation based on differential-direction drilling

Cited by 11 publications

References 9 publications

The Performance Analysis of Grouting Repair Effect on the Accuracy of Disturbance Stress Test in Damaged Surrounding Rock Mass

The Performance Analysis of Grouting Repair Effect on the Accuracy of Disturbance Stress Test in Damaged Surrounding Rock Mass

Research on in situ stress inversion of deep‐buried tunnel based on pressure/tension axis mechanism and geological structure

Modification of the CSIRO method in the long-term monitoring of slope-induced stress

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