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Experimental study on physical model of reinforced concrete lined
pressure tunnel with inducing joints
WU Weijiang ，WANG Xiaogang ，LIU Xueshan ，YING Pengtao ，
1
3
1，2
3

4
SHAO Minglei ，ZHANG Qiang 1

（1. State Key Laboratory of Water Cycle and Water Security，China Institute of Water Resources and

Hydropower Research，Beijing 100038，China；2. College of Transportation Science & Engineering，Nanjing Tech University，

Nanjing 211816，China；3. Engineering Construction Management branch of China Southern Power Grid Peak Regulation and

Frequency Modulation Power Generation Co.，LTD，Guangzhou 511499，China；4. China Power Construction

Group Northwest Survey Design and Research Institute Co.，LTD，Xi’an 710065，China）

Abstract：Reinforced concrete lining is a preferred lining structure type for pressure tunnels，which may experience

cracking under high hydraulic heads. However，the location and number of cracks are random，making effective

monitoring and control difficult and introducing uncertainty during the long-term safe operation of the tunnel. To over‐
come the shortcomings of traditional reinforced concrete linings，a new structure of reinforced concrete lining with

inducing joints has been proposed，ransforming passive cracking into active cracking. Through conducting physical
t
model tests on the water filling and emptying of pressure tunnels with the new lining structure，the stress characteris‐

tics of the lining structure during the first and second filling and draining processes have been analyzed，thereby vali‐
dating the effectiveness of the new lining structure. The test results indicate that during the initial water filling pro‐

cess，after the lining cracks，the water pressure on the outside of the lining experiences a rapid increase. As the pres‐

sure difference between inside and outside of the lining gradually decreases and approaches equilibrium，the lining

and the reinforcement transition from a tensile state to a compressive state circumferentially. In the second filling and
emptying process，the water inside and outside of the lining are connected，with water pressure rising and falling syn‐

chronously. The initial circumferential stress of the lining shows a transient tension and then a gradual compression

state. After the first and second water fillings，the reinforced concrete lining with a inducing joint had only one

through-crack along the inducing joint，with no cracks in other areas. The results of the model tests confirmed that the

reinforced concrete lining containing inducing joints can achieve controllable crack locations，measurable crack

widths，and targeted corrosion prevention for the reinforcement，overcoming the shortcomings of traditional rein‐

forced concrete linings and providing new ideas for the design of permeable reinforced concrete linings in high-head
pressure tunnels.

Keywords：pumped storage power stations；pressure tunnel；reinforced concrete lining with inducing joints；physi‐

cal model testing
（责任编辑：韩 昆）
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