The Mechanical Mechanism of Hulking Force Stable Principle of Surrounding Rocks in Soft Rock Roadway

2014 ◽  
Vol 1065-1069 ◽  
pp. 830-834
Author(s):  
Wei Pei Xue ◽  
Lai Wang Jing
Keyword(s):  
Stress State ◽  
Ultimate Strength ◽  
Soft Rock ◽  
Reference Value ◽  
Industrial Test ◽  
Surrounding Rock ◽  
Support Mechanism ◽  
Rock Creep ◽  
Main Factors

This paper aims to reveal the important role of the hulking force in stabilizing the roadway. After introducing the three ultimate strength of the foundation rock upon, starting from the perspective of stress state, the article on the deformation area surrounding rock for a more reasonable division, and thus gives the main factors roadway deformation.Introduced in the basis of the three ultimate strength of the rock, from the perspective of stress state, deformation of roadway surrounding rock area to carry on the reasonable division, and then the main factors of roadway deformation is presented. Second, through the analysis of the formation of the hulking force, analysis of hulking force inhibition of surrounding rock creep mechanism of dynamic mechanics,and analysis of the hulking force to improve the effect of supporting mechanics mechanism. Describes the important role of the hulking force on the stability of surrounding rock. Finally, Huaibei Coal Mining Co., 8203 guobei roadway industrial test site, Demonstrates the effectiveness of the principle. Results of this study have important reference value to change the current research in deep coal mine deep soft rock and loose seam roadway support mechanism and technology.

The Principle and Method of the Backplane Anchor in Controlling the Overall Stability of the Surrounding Rock

2014 ◽  
Vol 1065-1069 ◽  
pp. 835-839
Author(s):  
Zhi Wei Li ◽  
Lai Wang Jing ◽  
Ren Shu Yang ◽  
Peng Wei Hao
Keyword(s):  
Stress State ◽  
High Stress ◽  
Soft Rock ◽  
Mining Area ◽  
State Theory ◽  
Industrial Test ◽  
Surrounding Rock ◽  
Overall Stability ◽  
Control Principle ◽  
Mine Hoist

The purpose of the article is to introduce a kind of control theory and technology of roadway floor heave and the surrounding rock of the upper part deformation in a high stress field. On the basis of the stress state theory in the modern mechanics, this paper which uses Yang Zhuang III1 mining area coal mine hoist room as the research and experimental object proposes a backplane anchor control principle and technology of the overall stability surrounding rock from the perspective of improving the stress state of surrounding rock particles. After the site industrial test,the technology has a very significant effect on the control of global stability of the surrounding rocks, large section, soft rock roadways and chambers.

scholarly journals Analysis of Surrounding Rock Creep Effect on the Long-Term Stability of Tunnel Secondary Lining

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Xiaoqian Zhang ◽  
Chengmin Wei ◽  
Heng Zhang
Keyword(s):  
Stress Measurement ◽  
Soft Rock ◽  
In Situ Stress ◽  
Calculation Model ◽  
Surrounding Rock ◽  
In Situ Stress Measurement ◽  
Rock Creep ◽  
Secondary Lining ◽  
Rock Tunnel

The secondary lining failure of deep buried soft rock tunnel often occurs, which is obviously related to the time factor. The formation mechanism of this phenomenon is studied in this paper. Therefore, the combination of in situ stress measurement and neural network inversion is used to analyze the distribution characteristics of in situ stress. At the same time, the creep characteristics of surrounding rock are tested in laboratory, and the key parameters are obtained. Combined with the characteristics of surrounding rock, the calculation model is established by using discrete element simulation technology and considering the joints of surrounding rock. According to the above multiple information, the stress characteristics of the secondary lining in different time periods are analyzed creatively. Finally, the method of setting arch and adding anchor bolt in key parts is proposed, and significant effect results are obtained.

scholarly journals In Situ Needle Penetration Test and Its Application in a Sericite Schist Railway Tunnel, Southwest of China

Lithosphere ◽  
2021 ◽  
Vol 2021 (Special 4) ◽  
Author(s):  
Jiaxing Dong ◽  
Runxue Yang ◽  
Chenggang Guo ◽  
Meiqian Wang ◽  
Yonghong Wu ◽  
...  
Keyword(s):  
Large Deformation ◽  
Soft Rock ◽  
Reference Value ◽  
Surrounding Rock ◽  
Mechanical Parameters ◽  
Penetration Index ◽  
Needle Penetration ◽  
Joint Direction ◽  
Rock Tunnel

Abstract The sericite schist is a typical metamorphic soft rock. Large deformation of surrounding rock often occurs in the construction of a tunnel in this stratum. Due to the broken rock mass structure and poor mechanical strength in Baishitou tunnel project of Dalin line of Southwest railway, it is impossible to prepare standard samples for a traditional rock mechanical test. Therefore, we chose penetrometer (SH-70) for an in situ test. Firstly, we monitored the deformation of typical sections and analyzed the characteristics of large deformation of soft rock in the tunnel. Secondly, we tested the needle penetration index of fresh excavation face and side wall. Then, we estimated some mechanical parameters of sericite schist by a needle penetrometer and Hoek-brown criterion and discussed the acquisition of mechanical parameters of soft rock. The results show the following: (1) the characteristics of extrusion rock tunnel are summarized as large deformation, fast deformation rate, and obvious construction disturbance. (2) The reference value of penetration index of sericite schist (the vertical joint direction) is 3.90~7.77 N/mm, and the parallel joint direction is 1.27~2.99 N/mm. (3) The uniaxial compressive strength estimated by a penetrometer is 0.78~8.53 MPa, and the strength of the surrounding rock is negatively correlated with the amount of deformation. Therefore, it can be considered that the insufficient strength of surrounding rock is the fundamental reason for large deformation. (4) The reference value of cohesion of sericite schist estimated by a penetrometer is 0.203 MPa, and the reference value of internal friction angle is 18.224°. Compared with the common estimation methods, the penetrometer is more convenient and economical, which can provide a new idea for obtaining the mechanical parameters of sericite schist soft rock tunnel.

Research on Support Technology of Long Anchor in Fully-Mechanized Caving Thick Coal Broken Roadway

2013 ◽  
Vol 734-737 ◽  
pp. 809-814 ◽  
Author(s):  
Guang Rong Yang ◽  
Ji Li ◽  
Fei Wang ◽  
Xi Dong Zhao
Keyword(s):  
Simulation Analysis ◽  
New Technology ◽  
Industrial Test ◽  
Surrounding Rock ◽  
Test Results ◽  
Analogy Method ◽  
Anchor Cable ◽  
Surrounding Rock Pressure ◽  
Mining Face

The 5204 transport roadway roof displacement encountered during the tunneling and mining is more than 240mm, which severely damaged the shape of the roadway. The anchor cable of the top is pulled off and supporting failure takes place. According to the analysis of the surrounding rock pressure behavior law, the concept of supporting new technology based on the concept of "coordinating role of long bolt - surrounding rock" is brought up. This technology can achieve a reasonable match of the supporting object with the displacement and support strength of the surrounding rock. Based on this concept, FLAC3D numerical simulation analysis, combined with the engineering analogy method, produces the long bolting parameters on the 5402 transport roadway. The industrial test results show that in the mining face, the force state of the long bolt is good. When larger displacement in the roof appears, the long bolt is not pulled off and the support failure does not occurs .It means the long bolt has adapted the large deformation of the roadway roof. The research results can provide a reference for similar mechanized caving roadway supporting.

Supporting Technology Research of Concrete Filled Steel Tubular Support in Extremely Soft Rock Mining Area

2013 ◽  
Vol 353-356 ◽  
pp. 1559-1565 ◽  
Author(s):  
Jun Wang ◽  
Guang Long Qu ◽  
Zheng Ze Wang ◽  
De Ke Sun
Keyword(s):  
Mineral Composition ◽  
Clay Mineral ◽  
Soft Rock ◽  
High Strength ◽  
Mining Area ◽  
Industrial Test ◽  
Surrounding Rock ◽  
Long Term Stability ◽  
Concrete Layer ◽  
Rock Mining

Inner Mongolia's xilingol league area of chagannaoers main inclined shaft is extremely soft rock roadway with the properties of 0.12 ~ 5.12MPa in uniaxial compressive strength of rock, 60.6% in clay mineral content and 82% of clay mineral composition is montmorillonite, and with the feature of argillation and expansion by absorbing water in surrounding rock. The two previous supporting schemes for this roadway were double16a I-beam and 650mm concrete layer as the first scheme, and close U36 steel stents as the repairing scheme, respectively. Both of them were failed to control deformation failure of surrounding rock. In this paper, a new supporting scheme was proposed by testing mechanics parameters and mineral composition of surrounding rock, analyzing hydraulic properties of surrounding rock and deformation failure, and evaluating surrounding rock load. This new scheme consists of high strength pressure-bearing ring supporting technology based on concrete filled steel tubular support and surrounding rock partial pressure-releasing technology. Aiming at deformation of side walls of the main inclined shaft roadway, a test was carried out to study the bending resistance of the support and improve the support. The industrial test showed that the new supporting scheme can effectively control the deformation of the main inclined shaft surrounding rock and realize long-term stability of roadway.

scholarly journals Study on the Large Deformation Characteristics and Disaster Mechanism of a Thin-Layer Soft-Rock Tunnel

2020 ◽  
Vol 2020 ◽  
pp. 1-15 ◽  
Author(s):  
Xiulian Zhang ◽  
Manchao He ◽  
Fengnian Wang ◽  
Gan Li ◽  
Shengxin Xu ◽  
...  
Keyword(s):  
Thin Layer ◽  
Water Absorption ◽  
Large Deformation ◽  
Soft Rock ◽  
Surrounding Rock ◽  
Left Shoulder ◽  
Deformation And Failure ◽  
Maximum Deformation ◽  
Factors Influencing ◽  
Main Factors

In view of the large deformation of thin-layer soft rock in the No. 2 inclined shaft of the Muzhailing Tunnel, we performed an experimental investigation on the mineral composition, physical characteristics, and uniaxial compressive strength of the surrounding rock of the tunnel. The characteristics of the large deformation of the surrounding rock of the tunnel were analyzed, and the main factors influencing the deformation of the tunnel were revealed. The influence of various factors on the large deformation of the surrounding rock was analyzed using the 3DEC-Trigon discrete element numerical simulation method. The results show that (1) the deformation of the surrounding rock of the tunnel has remarkable asymmetry, the deformation of the initial support of the tunnel is significant, and the buried depth of the area where the maximum deformation of the tunnel exceeded 1 m is greater than 500 m; (2) the main factors influencing the deformation of a thin-layer slate tunnel include joint inclination, buried depth, water absorption, and softening of the surrounding rock; and (3) the maximum deformation of the surrounding rock is observed for a joint angle of 45°, at which the buried depth is directly proportional to the deformation and failure of the tunnel. Furthermore, after the surrounding rock was softened by water absorption, the floor of the tunnel, the left shoulder socket, and the right side of the tunnel are deformed greatly. The results of this study will provide a theoretical basis for the study of similar deformation control methods and supporting measures for tunnels excavated in thin-layer soft rock.

Influence of Soft Rock Factor and Time Dependence in Deep Tunnel

2013 ◽  
Vol 353-356 ◽  
pp. 1625-1629
Author(s):  
Yan Chen ◽  
Xiao Chun Zhang ◽  
Hua Rong Wang ◽  
Nan Tong Zhang
Keyword(s):  
High Stress ◽  
Soft Rock ◽  
Reference Value ◽  
Simulation Method ◽  
Internal Force ◽  
Surrounding Rock ◽  
Deep Tunnel ◽  
Plastic Properties ◽  
Whole Process ◽  
Rock Tunnels

With the development of highway tunnel engineering, the stability of the tunnel become the chief problem in designing and constructing. Tunnel surrounding rock under high stress based on the actual engineering background, model test process of excavation in soft rock tunnels under the distribution factors was finished in triaxial test mechine. Through sensor test, the whole process of tunnel became instable was reflected, and the different conditions of the change rule of surrounding rock stress was budgeted and analysed. the numerical simulation method was used to study dependency of deep tunnel with soft rock in it and the lining deformation time. in which nonlinear Drucker-Prager plastic coupling and creep constitutive model were used to describe the nonlinear viscous-elastic-plastic properties of high stress soft rock. The characteristies of tunnel lining deformation and internal force variation were studied with the above model. Soft rock thickness, soft rock tunnel location effect on inner force and deformation of the structure were discussed. The results have reference value in evaluation of long-term stability of deep tunnel.

scholarly journals Deformation Mechanism and Surrounding Rock Control in High-Stress Soft Rock Roadway: A Case Study

2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Yuwen Gao ◽  
Chen Wang ◽  
Yong Liu ◽  
Yuyang Wang ◽  
Lianchang Han
Keyword(s):  
Theoretical Analysis ◽  
High Stress ◽  
Soft Rock ◽  
Stability Control ◽  
Steel Tube ◽  
Field Application ◽  
Industrial Test ◽  
Surrounding Rock ◽  
Guizhou Province ◽  
Deformation And Failure

Stability control for soft and broken surrounding rock of roadways is one important segment of mining support. Taking 1412 Roadway of a mine in Guizhou province as a research background, this paper studies the large deformation of surrounding rock and the failure of bolts and cables. The deformation and failure mechanism are analyzed by related theoretical analysis and field survey. Then, the feasibility of the composite controlling scheme, bolts and cables + grouting + steel tube concrete support, is verified by theoretical analysis, numerical simulation, and industrial test. Following results can be obtained: main reasons leading to the deformation of surrounding rock and the failure of cables and blots in the roadway are low strength and poor self-stability of surrounding rock, complex stress environment, low support resistance, and lack of reinforced support in crucial supporting sites; the control scheme can reduce the surrounding rock deformation by 40%, which meets the requirements of field application so that this practice can provide some guidance for other similar projects.

Design and Performance Analysis of Yielding Anchor Bolt with Large Deformation

2012 ◽  
Vol 215-216 ◽  
pp. 21-26
Author(s):  
Zhi Ming Jiang ◽  
Cheng Jun Wang ◽  
Tao He
Keyword(s):  
Large Deformation ◽  
Soft Rock ◽  
Surrounding Rock ◽  
Anchor Bolt ◽  
Support Mechanism ◽  
And Performance ◽  
Soft Rock Roadway ◽  
Matlab Programming ◽  
Loose Support ◽  
Rock Roadway

According to the principle of the spring constant support device, a kind of large deformation yielding anchor bolt with three elongation properties has been designed. This paper analyzes the performance of the dynamically-pressured soft rock roadway surrounding rock and support mechanism of yielding anchor, carries out the force analysis of the anchor head, derives equation of the knife-type cam and uses Matlab programming to solve the knife -shaped cam contour curve. In the condition of keeping certain anchoring force, the anchor head can produce large displacement along the anchor body in order to decrease the pressure. And after the pressure of surrounding rock relief, the anchor head can move back to add pressure to form a “Loose - support”cycle of flexible supporting.

FISCAL ROLE OF EXCISE TAX ON EXCISE GOODS MANUFACTURED IN UKRAINE IN CONDITIONS OF CONSTANT CHANGES IN TAX LEGISLATION AND PANDEMIC COVID-19

2017 ◽  
Author(s):  
Natalia Rudenko ◽  
◽  
Tatiana Tuchak ◽  
Keyword(s):  
European Integration ◽  
Economic Crisis ◽  
The State ◽  
Excise Tax ◽  
Tax Revenues ◽  
Tax Legislation ◽  
Economic Stagnation ◽  
Legislative Framework ◽  
Main Factors

The article analyzes the fiscal role of the excise tax on excisable goods (products) produced in Ukraine in the context of permanent changes in the tax legislative framework and within the framework of the global crisis through the coronavirus disease COVID-19. The concept of excise tax has been substantiated, a list of excisable products (goods) has been provided in accordance with legislative acts, the payers of this tax have been specified. The most important events and transactions that influenced the amount of tax revenues from excise tax are investigated. The authors believe that the main reason for the changes in the administration process and the receipt of the excise tax are the European integration transformations and the conditions of the global socio-economic crisis. Based on the difficult economic situation in the state, some legislative acts regulating the collection of excise tax from excisable products produced in the country were considered. It was revealed that a moratorium on the payment of excise tax was imposed on the territory of the studied state for a certain period. This event made its own adjustments to the proceeds from the payment of excise tax on excisable products (goods) produced domestically, and also allowed domestic producers to move from the place of economic stagnation. In Ukraine, they began to actively manufacture and sell antiseptic and disinfectants of their own production to protect citizens. According to the data of the State Treasury Service of Ukraine, the authors analyzed the indicators of tax revenues for each type of excisable products (goods) of domestic production. It was revealed from which products more tax was received during the study period. The main factors that influenced the receipts of excise tax from excisable goods produced on the territory of Ukraine in the period of 2019, as well as for 9 months of 2020, have been determined.

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