CAJ | 학술논문

小浪底排沙洞是我国首例采用无粘结预应力混凝土衬砌的水工隧洞，根据运行期间混凝土应变计所获得的大量实测数据，对排沙洞衬砌混凝土应变在温度和内水压力影响下的变化进行了分析。结果表明，对于同一衬砌段，端部断面内侧混凝土的温度影响系数αT 大于端部断面厚度中部；3＃排沙洞ST3-A 段端部断面αT 比中部断面小，而 ST3- B 段正好相反；同一断面位于时钟6∶00、12∶00位置的αT较大，平均值约为-6．83με/℃；对于同一时钟位置，衬砌厚度内侧水头影响系数αW 大于衬砌厚度中部；3＃排沙洞衬砌的αW 小于2＃排沙洞。分析结果表明，在温度和水头作用下，衬砌混凝土应变计所在位置的混凝土应力均为压应力，没有产生引起裂缝的拉应力，小浪底排沙洞可正常使用。
소랑저배사동시아국수례채용무점결예응력혼응토츤체적수공수동，근거운행기간혼응토응변계소획득적대량실측수거，대배사동츤체혼응토응변재온도화내수압력영향하적변화진행료분석。결과표명，대우동일츤체단，단부단면내측혼응토적온도영향계수αT 대우단부단면후도중부；3＃배사동ST3-A 단단부단면αT 비중부단면소，이 ST3- B 단정호상반；동일단면위우시종6∶00、12∶00위치적αT교대，평균치약위-6．83με/℃；대우동일시종위치，츤체후도내측수두영향계수αW 대우츤체후도중부；3＃배사동츤체적αW 소우2＃배사동。분석결과표명，재온도화수두작용하，츤체혼응토응변계소재위치적혼응토응력균위압응력，몰유산생인기렬봉적랍응력，소랑저배사동가정상사용。
Xiaolangdi sediment tunnels are the first waterway engineering using un-bonded pre-stressed lining in China . Based on a large number of data obtained by concrete strain gauges in operation periods ,the strain changes of the lining concrete under temperature and internal water pressure were analyzed .The results show that ,within the same lining seg-ments ,the temperature influence coefficient αT in the inside of the end sections was greater than that in the middle of the end sections .Within the same clock locations ,the water head influence coefficient αW in the inside was greater than that in the middle of the lining .Simultaneously ,the analysis results show that under the effects of temperature and internal water pressure ,all concrete stresses were compressive stresses ,and no cracks and leakage were produced ,which could ensure the safe operation of Xiaolangdi sediment tunnels .