After mending, the inner strength of the concrete liner is obviously improved, the averaged compressive strength and bending strength of the silica cement mortar reach 48 6? MPa and 11 8?

Since 1980s,for a variety of reasons in construction system,management ability,design and construction levels,the quality of partial works in Chinese water conservancy & hydropower project construction has been poor,resulting in serious quality accidents such as dam failure and intake tunnel concrete liner collapse etc.

Author summarizes and analyses strong points and weakness of construction methods of tunnel concrete liner through his personal experience to 18 tunnels'(51 85km length) construction of Zhaoshandu Water Diversion Project,and stressly presents some key to accomplish tunnel concrete liner quickly and effectively in construction,for reference to readers.

A Measurement of Released Stresses and Analysis of the Behaviors of the Underground Arch With Reinforced Concrete Liner in Liujiaxia Hydraulic Power Station

However, argumentation of experts based on site testing during construction leads to the replacing of original scheme by unbonded pre-stressed concrete liner.

Through the comparison of the schemes of the hydraulic pipeline of the connecting section of Wanjiazhai YRDP, this paper analyzes and demonstrates the application of PCCP in the tunnel and its superiority over the application of the cast-in-situ reinforced concrete liner in this engineering.

Combined with field data, this paper has discussed the effectiveness of ground penetrating radar (GPR) in the inspection of construction quality of concrete liner of highway tunnel and water culvert and the distribution of reinforced steel bar in the concrete liner.

The tunneling contractor was able to excavate the collapsed tunnel and install the concrete liner without any further difficulties.

The extensive anchor pullouts at the Callahan Tunnel warrant eventual retrofit of all anchorages to the concrete liner.

The current conceptual design of the emplacement drift does not include a concrete liner.

One was to strengthen the interior silo walls with a reinforced concrete liner.

After cutting the tunnel a liner is installed, followed by a waterproofing membrane that is covered by a second concrete liner.

In this general program, the characteristic method of equal time interval grid is used for calculating water hammer, the gate is nonlinearly (or linear ly ) opened and closed. The program is concise, accurate, and easy to use. Less memory elements and shorter calculating time are needed only. Different results of calculating water hammer in series pipes or simple pipes can be quickly obtained by keying in various data. ( without modifying the program ) It may be used for water hammer calculation in combined...

In this general program, the characteristic method of equal time interval grid is used for calculating water hammer, the gate is nonlinearly (or linear ly ) opened and closed. The program is concise, accurate, and easy to use. Less memory elements and shorter calculating time are needed only. Different results of calculating water hammer in series pipes or simple pipes can be quickly obtained by keying in various data. ( without modifying the program ) It may be used for water hammer calculation in combined series pipe-lines and various simple pipe-lines, such as steel pipes, reinforced concrete pipes in open air, non-lined tunnels, underground pipe-lines (steel plate liner, reinforced concrete liner, and combined liner), etc. It is especially efficient to calculate water hammer for many different cases.

The thermo-elastic reciprocal theorem is applied to deduce the formulas for calculating the width of radial crack due to thermal load. Based on the calculated results of the crack width for internal pressure, the circumferential displacement of the outer surface of the cylindrical concrete liner due to the temperature difference between outside and inside can be derived. Thus, the amount of radial crack can be estimated. Finally, The magnitude of the opening and closing of the cracks due to the variation...

The thermo-elastic reciprocal theorem is applied to deduce the formulas for calculating the width of radial crack due to thermal load. Based on the calculated results of the crack width for internal pressure, the circumferential displacement of the outer surface of the cylindrical concrete liner due to the temperature difference between outside and inside can be derived. Thus, the amount of radial crack can be estimated. Finally, The magnitude of the opening and closing of the cracks due to the variation of temperature can be calculated.

In this paper,the interface stress element model for discontinuous media is established in accordance with the characteristics of shield tunnel for transporting water through Yellow River in the project of diverting water from the South to the North.A careful imitation of two layer reinforced concrete liner tube is made and the interaction between the liner and the soil is taken into consideration.Theoretical analysis and numerical...

In this paper,the interface stress element model for discontinuous media is established in accordance with the characteristics of shield tunnel for transporting water through Yellow River in the project of diverting water from the South to the North.A careful imitation of two layer reinforced concrete liner tube is made and the interaction between the liner and the soil is taken into consideration.Theoretical analysis and numerical results show that the model,being precise,adaptable and especially good at imitating the discontinuous deformation of various cracks,has a wide range of application.