CAJ | 학술논문

小湾拱坝坝体裂缝在大坝分阶段实际蓄水后开裂扩展的可能性以及裂缝对坝体应力、位移和坝体稳定性的影响，对大坝安全至关重要。通过对小湾拱坝坝体施工过程及坝体内部温度裂缝的模拟，基于多点监测资料进行非线性位移反演分析，得到符合实际的材料力学参数，进而对坝体进行三维非线性仿真计算研究，以预测坝体在下一阶段蓄水以及最终蓄水后的稳定性。结果表明，该反演分析方法反演得到的参数合理准确，预计的位移结果可靠、精度较高，能很好地对拱坝安全性进行评价；仿真分析预测成果与坝体后期蓄水后的实际监测成果和地质力学模型试验成果吻合良好，在正常水载下，坝体整体变形符合拱坝变形一般规律，同时裂缝发生开裂扩展的可能性很小；裂缝对坝体整体影响不大，对局部有影响，大坝极限开裂状态与无缝坝类似，坝面开裂均是由表面产生裂缝向内部发展，而不是由内部裂缝引发。
소만공패패체렬봉재대패분계단실제축수후개렬확전적가능성이급렬봉대패체응력、위이화패체은정성적영향，대대패안전지관중요。통과대소만공패패체시공과정급패체내부온도렬봉적모의，기우다점감측자료진행비선성위이반연분석，득도부합실제적재료역학삼수，진이대패체진행삼유비선성방진계산연구，이예측패체재하일계단축수이급최종축수후적은정성。결과표명，해반연분석방법반연득도적삼수합리준학，예계적위이결과가고、정도교고，능흔호지대공패안전성진행평개；방진분석예측성과여패체후기축수후적실제감측성과화지질역학모형시험성과문합량호，재정상수재하，패체정체변형부합공패변형일반규률，동시렬봉발생개렬확전적가능성흔소；렬봉대패체정체영향불대，대국부유영향，대패겁한개렬상태여무봉패유사，패면개렬균시유표면산생렬봉향내부발전，이불시유내부렬봉인발。
The effects of cracking of Xiaowan arch dam on the possibility of cracking propagation,and on the stress,displacement and stability should be considered seriously after phased realistic impounding. The basic principle is three-dimensional nonlinear numerical computation by simulation of the construction process of Xiaowan arch dam and the cracks in the dam based on reasonable material parameters which are obtained by the multipoint displacement back analysis on the basis of the monitoring data. The result indicates that the parameters obtained by the displacement back analysis are reasonable and accurate;and the prediction of the dam displacement is of high precision,which can provide a good stability estimation of the dam. The predicting results fit well with the monitoring data and the results of geomechanical model test. The global deformation of the dam accords with the general pattern;and the possibility of crack propagation is very small under the normal water load. The effects of cracking on the global stability of the dam are very small;and the limit state of the dam is similar to that of no cracking working condition. Both of them crack from the surface to the inside,instead of cracking from the internal cracking.