Experimental Study on Fiber Concrete Lining in Tunnel with Seismic Dynamic Response

2013 ◽  
Vol 671-674 ◽  
pp. 1126-1130
Author(s):  
Jia Mei Zhou ◽  
Guo Wang Meng ◽  
Yao Yao Hu ◽  
Cai Zhang Xu
Keyword(s):  
Dynamic Response ◽  
Plain Concrete ◽  
Theory Model ◽  
Tunnel Lining ◽  
Fiber Reinforced Concrete ◽  
Shaking Table ◽  
Concrete Lining ◽  
Time Curve ◽  
Fiber Concrete ◽  
Similar Theory

Sesmic dynamic response of Fiber Reinforced Concrete tunnel lining is studied in contrast to the plain concrete. Based on similar theory, model test has been carried out through the 5m×5m triaxial shaking table by inputting sesmic wave, then the damage characteristics of tunnel lining is acquired.The test results show that both the plain concrete and fiber concrete is brocken by sesmic load, but fracture form is not the same,the crack on Fiber concrete is narrow and sawtooth , the crack on plain concrete is wide and straight.Fiber concrete lining strain-time curve is sawtooth partly, it’s vibration reponse is a little lagger than that of plain concrete.It indicats that kinematic velocity of concrete granule is decreased and sesmic energe is absorbed by fiber cohesive force,then frequence amplitude can be reduced.So fiber concrete can be proved as fine anti-seismic material.

scholarly journals Model Test on Bearing Characteristics of Basalt Fiber-Reinforced Concrete Lining

2020 ◽  
Vol 2020 ◽  
pp. 1-10 ◽  
Author(s):  
Dao-yuan Wang ◽  
Jia-suo Qi ◽  
Guang-yao Cui ◽  
Yanling Yang ◽  
Jie Chang
Keyword(s):  
Reinforced Concrete ◽  
Characteristic Curve ◽  
Basalt Fiber ◽  
Plain Concrete ◽  
Initial Crack ◽  
Fiber Reinforced Concrete ◽  
Concrete Lining ◽  
Fiber Reinforced ◽  
Bearing Characteristic ◽  
Rock Tunnel

Adding fiber can improve the brittleness of plain concrete. Compared with plain concrete, basalt fiber-reinforced concrete has the advantages of strengthening, toughening, and crack resistance. Compared with steel fiber-reinforced concrete, basalt fiber-reinforced concrete has better construction performance. Basalt fiber concrete is a type of inorganic material with environmental protection and high mechanical properties, which has an important mechanical advantage for controlling the deformation of the soft surrounding rock tunnel. Through the indoor model test of mechanical behavior of reinforced concrete and basalt fiber-reinforced concrete lining, the bearing characteristics of basalt fiber-reinforced concrete lining was studied. The results show that, compared with reinforced concrete, the initial crack load of basalt fiber-reinforced concrete is increased by 20%; the toughness of lining structure is enhanced by adding basalt fiber, and the lining can still bear large bending moment and deformation after the initial crack appears; after the initial crack appears, the bearing characteristic curve of reinforced concrete lining rises slowly and converges rapidly; the bearing characteristic curve of basalt fiber-reinforced concrete lining rises slowly, and there is no sign of convergence when it reaches 2 times of initial crack load. For the soft surrounding rock tunnel, it is necessary to seal the rock surface as early as possible, provide support as soon as possible, and have a certain deformation capacity. Basalt fiber-reinforced concrete can better meet these needs.

Mechanical Properties of Polypropylene Fiber Concrete after High Temperature

2014 ◽  
Vol 662 ◽  
pp. 24-28 ◽  
Author(s):  
Xi Du ◽  
You Liang Chen ◽  
Yu Chen Li ◽  
Da Xiang Nie ◽  
Ji Huang
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Reinforced Concrete ◽  
Polypropylene Fiber ◽  
Plain Concrete ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Fiber Concrete ◽  
Compressive Strength Of Concrete ◽  
Polypropylene Fiber Reinforced Concrete

With cooling tests on polypropylene fiber reinforced concrete and plain concrete that were initially subjected to different heating temperatures, the change of mechanical properties including mass loss, uniaxial compressive strength and microstructure were analyzed. The results show that the compressive strength of concrete tend to decrease with an increase in temperature. After experiencing high temperatures, the internal fibers of the polypropylene fiber reinforced concrete melted and left a large number of voids in it, thereby deteriorating the mechanical properties of concrete.

PERMEABILITY OF TUNNEL LINING WITH AIR/WATER BUBBLES ON CONCRETE SURFACE

2014 ◽  
Vol 1 (1) ◽  
Author(s):  
Tomoyuki Maeda ◽  
Hiroki Honma ◽  
Masayuki Hirano ◽  
Isamu Yoshitake
Keyword(s):  
Gas Permeability ◽  
Plain Concrete ◽  
Concrete Surface ◽  
Air Permeability ◽  
Tunnel Lining ◽  
Distribution Area ◽  
Concrete Lining ◽  
Bubble Distribution ◽  
Logarithmic Curve ◽  
The Aesthetic

Air and water bubbles are likely to remain on concrete sidewalls in tunnel linings, because the sidewalls are generally constructed with a greater slope than a right angle. The bubbles negatively influence the aesthetic of the concrete lining. In addition, concrete with a lot of large bubbles may decrease durability, such as air permeability. Although most tunnel lining is constructed as plain concrete without reinforcement, the low permeability may affect the maintenance and long-term durability of the tunnel. The study aims to examine the effect of bubble distributions on the permeability of concrete lining. Concrete specimens including various bubble distributions are prepared by using variable angle-forms in a laboratory test. Furthermore, the bubble distribution (area ratio) and the permeability are examined in two actual tunnels. This paper presents a relationship between bubble distribution and air permeability based on these tests. The results show that the relationship is a logarithmic curve of the bubble rate and gas permeability.

scholarly journals Vulnerability analysis of tunnel linings under blast loading

2018 ◽  
Vol 10 (1) ◽  
pp. 73-94 ◽  
Author(s):  
Ranjit Kumar Chaudhary ◽  
Sunita Mishra ◽  
Tanusree Chakraborty ◽  
Vasant Matsagar
Keyword(s):  
Syntactic Foam ◽  
Blast Loading ◽  
Plain Concrete ◽  
Tunnel Lining ◽  
Fiber Reinforced Concrete ◽  
Steel Fiber Reinforced Concrete ◽  
Cement Concrete ◽  
Element Analysis ◽  
Suitable Material ◽  
Reinforced Cement

In the present study, a comparative assessment on the performance of conventional and advanced tunnel lining materials subjected to blast loading is done using a three-dimensional non-linear finite element analysis procedure. The conventional tunnel lining materials analyzed herein are plain concrete, steel, reinforced cement concrete, and steel fiber–reinforced concrete. The advanced tunnel lining materials analyzed herein are dytherm, polyurethane, and aluminum syntactic foam sandwich panels with steel–foam–steel composites. The pressure generated by 10 kg Trinitrotoluene (TNT) is applied to each element on the inner wall of the tunnel which has an effect equal to the scaled distance Z = 1.16 m/kg1/3. Analyses are conducted by varying the thickness of lining materials for a tunnel built in rock domain. The response of the tunnel lining materials, for example, deformation, stresses, and strains generated at different interfaces, is compared with each other to assess the best suitable material for the present blast scenario discussed herein. It is observed from the simulations that the reinforced cement concrete and steel–aluminum syntactic foam (90 µm)–steel are found to be the suitable tunnel lining materials for the present blasting scenario described herein. Moreover, a set of probabilistic analysis is also performed for the suitable tunnel lining materials decided through deterministic analyses using Monte Carlo simulations. The results obtained are normal random distribution curves depicting the extent of deformation in lining materials. A probability failure curve is also proposed for the suitable lining materials.

Early Stage Tunnel Lining Experimental Study of Jinhuashan Railway Tunnel Construction within Soft and Weak Rock Mass

2012 ◽  
Vol 204-208 ◽  
pp. 1532-1537
Author(s):  
Li Qiao Jin ◽  
Tai Quan Zhou ◽  
Bao Hua Lv
Keyword(s):  
Rock Mass ◽  
Reinforced Concrete ◽  
Early Stage ◽  
Tunnel Lining ◽  
Fiber Reinforced Concrete ◽  
Concrete Lining ◽  
Fiber Reinforced ◽  
Railway Tunnel ◽  
Tunnel Section ◽  
Lining Structure

Polypropylene fiber reinforced concrete can improve the common concrete flexibility and it is beneficial for interaction between concrete lining structure and rock mass. The use of fiber reinforced concrete with wet sprayed concrete technique can improve the concrete lining structure construction quality and improve the rock mass self-bearing capacity. The wet-sprayed fiber reinforced concrete is first introduced in Jinhuashan railway tunnel early stage lining structure within soft and weak rock mass. The design of Jinhuashan railway tunnel lining structure using fiber reinforced concrete is introduced and the requirement of material used is explained. To evaluate the lining effect using wet-sprayed fiber reinforced concrete, the online monitoring method is used to measure the rock mass pressure and the concrete lining layer stress for both the experimental tunnel sections and comparison tunnel section. The monitoring data result shows that the rock mass pressure in experimental section is even distribution with lower rock mass pressure and lower concrete lining layer stress. The value of rock mass pressure and tunnel lining layer stress in comparison tunnel section is a little higher than that in experimental tunnel section. The experimental tunnel section using fiber reinforced concrete has good lining effect.

Fiber Reinforced Concrete Frame Shaking Table Test

2014 ◽  
Vol 893 ◽  
pp. 597-601
Author(s):  
Guo Wang Meng ◽  
Jia Mei Zhou ◽  
Chuan Yi Sui ◽  
Qi Yan
Keyword(s):  
Reinforced Concrete ◽  
Failure Modes ◽  
Shaking Table Test ◽  
Plain Concrete ◽  
Fiber Reinforced Concrete ◽  
Shaking Table ◽  
Maximum Strain ◽  
Fiber Reinforced ◽  
Reinforced Concrete Frame ◽  
Maximum Acceleration

Two full scale frames were tested on a shaking table to investigate seismic performance and fracture mechanism of fiber reinforced concrete in contrast to the plain concrete. The information about acceleration response, the maximum strain value as well as the time to reach it, the typical strain - time curves and the crack development of two test frames were presented. Test results indicate that reinforced concrete did not crack during the test; the fiber reinforced concrete could better absorb or consume energy in the process of stress redistribution after peak acceleration; maximum strain and maximum acceleration did not occur at the same time; structure came into being deformation even failure when the seismic energy in the structure gone up to certain extent, and the dynamic failure would be their main failure modes.

scholarly journals Study on Dynamic Response Characteristics and Damage Mechanism of Tunnel Lining at Entrance of Shallow Bias Tunnel

2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Lin Li ◽  
Xiaodan Guo ◽  
Zuyin Zou ◽  
Zhanyuan Zhu ◽  
Zihong Guo ◽  
...  
Keyword(s):  
Dynamic Response ◽  
Structural Damage ◽  
High Speed ◽  
Shaking Table Test ◽  
Internal Force ◽  
Tunnel Lining ◽  
Shaking Table ◽  
Response Characteristics ◽  
Instability Problem ◽  
Dynamic Response Characteristics

The structural damage of the lining structure at the entrance of a tunnel is the most common instability problem. The instability problem may cause dynamic effects such as earthquakes and blasting. Based on the seismic damage data collected from previous major earthquakes at the entrance of shallow-buried tunnel, the shaking table test and numerical simulation are used to analyze dynamic response characteristics and damage evolution characteristics of the tunnel in the shallow-buried hole at 30°. The study revealed the stress characteristics of tunnel lining and the mechanism of structural damage under earthquake excitation. The research results show that the biased tunnel (30°) is susceptible to damage on the unsymmetrical loading side, the biased ground surface leads to acceleration, and high speed also significantly increases the effect. The biased side leg of the tunnel lining cross section is a location with a large internal force distribution. The biased tunnel has a relatively unfavorable internal force value distribution and a larger peak, and the peak at the larger bias side has the largest peak value. The skewback and spandrel portion of the biased tunnel lining load are more likely to be damaged.

Study on Fatigue Resistance Performance of Flexible Fiber and Rigid Fiber Reinforced Concrete

2012 ◽  
Vol 430-432 ◽  
pp. 619-622
Author(s):  
Ke Liu ◽  
Yan Ming Wang ◽  
Wen Wen Yang ◽  
Yong Sun
Keyword(s):  
Reinforced Concrete ◽  
Fatigue Resistance ◽  
Residual Strength ◽  
Plain Concrete ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Flexible Fiber ◽  
Fiber Concrete ◽  
Nylon Fiber ◽  
Resistance Performance

The fiber reinforced concrete with flexible fiber and rigid fiber respectively added into C30 plain concrete, curing under standard condition for 28 days, was used for fatigue resistance performance experiment. The flexible fiber is American Dura fiber and Chinese nylon fiber. The rigid fiber is Chinese steel fiber. The fatigue resistance property was evaluated by the residual strength after 400 thousand times fatigue damage. The result shows that the residual strength of C30 plain concrete was only 35.0% of initial value, but the residual strength of C30 fiber reinforced concrete still remained 75%~90% of initial value. The residual strength of steel fiber concrete, Dura fiber concrete, nylon fiber concrete, is respectively 2.5, 2.3 and 2.1 times of the plain concrete. The fiber reinforced concrete improves the fatigue resistance property compared with the plain concrete. The fatigue resistance ability of flexible fiber and rigid fiber reinforced concrete is close to each other.

scholarly journals Shaking Table Test on the Tunnel Dynamic Response under Different Fault Dip Angles

Symmetry ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 1375
Author(s):  
Duan Zhu ◽  
Zhende Zhu ◽  
Cong Zhang ◽  
Xinghua Xie
Keyword(s):  
Dynamic Response ◽  
Inclination Angle ◽  
Shaking Table Test ◽  
Material Selection ◽  
Sine Wave ◽  
Tunnel Lining ◽  
Shaking Table ◽  
Water Diversion ◽  
Peak Strain ◽  
Strain Data

Fault-crossing tunnels are often severely damaged under seismic dynamics. Study of the dynamic response characteristics of tunnels crossing faults is thus of great engineering significance. Here, the Xianglushan Tunnel of the Central Yunnan Water Diversion Project was studied. A shaking table experimental device was used, and four sets of dynamic model tests of deep-buried tunnels with different fault inclination angles were conducted. Test schemes of model similarity ratio, similar material selection, model box design, and sine wave loading were introduced. The acceleration and strain data of the tunnel lining were monitored. Analysis of the acceleration data showed that when the input PGA was 0.6 g, compared with the ordinary tunnel, the acceleration increases by 117% when the inclination angle was 75°, 127% when the inclination angle was 45°, and 144% when the inclination angle was 30°. This indicates that the dynamic response of the cross-fault tunnel structure was stronger than that of the ordinary tunnel, and the effect was more obvious as the fault dip angle decreased. Analysis of the strain data showed that the strain response of the fault-crossing tunnels was more sensitive to the fault dip. The peak strain and increase in fault-crossing tunnels were much larger than those of ordinary tunnels, and smaller fault dips led to larger increases in the strain peak; consequently, the tunnel would reach the ultimate strain and break down when the input PGA was smaller. Generally, the influence of fault inclination on the dynamic response of the tunnel lining should receive increased consideration in the seismic design of tunnels.

Research on Compact Resistance Performance of Flexible Fiber and Rigid Fiber Reinforced Concrete

2012 ◽  
Vol 430-432 ◽  
pp. 277-280
Author(s):  
Yan Ming Wang ◽  
Wen Wen Yang ◽  
Yong Sun ◽  
Ke Liu
Keyword(s):  
Reinforced Concrete ◽  
Steel Fiber ◽  
Impact Resistance ◽  
Plain Concrete ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Flexible Fiber ◽  
Fiber Concrete ◽  
Resistance Performance ◽  
The Impact

The fiber reinforced concrete with flexible fiber and rigid fiber respectively added into C30 plain concrete, curing under standard condition for 28 days, was used for impact resistance performance experiment. The flexible fiber is American Dura fiber and Chinese nylon fiber. The rigid fiber is Chinese steel fiber. The impact resistance property was evaluated by initial cracking times, final cracking times and impact toughness. The result shows that the impact toughness of steel fiber concrete, Dura fiber concrete and nylon fiber concrete is respectively 15.1, 3.4 and 2.7 times of the plain concrete. The fiber reinforced concrete improves the impact resistance property compared with the plain concrete. The impact resistance of rigid steel fiber reinforced concrete is increased greatly.

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