用原型观测资料反馈混凝土坝的实际安全度

Back Analysis of Actual Safety Degree of Concrete Dams with Prototype Observation Data

提出了利用大坝原型观测资料,应用改进后的JC法复核混凝土坝的稳定、强度和抗裂安全度的基本原理.其中重点研究各种坝型的主要随机变量的选择、失事模式、计算可靠指标时的初值选择.以及改进后的JC法迭代格式.应用这些原理复核了某重力坝的强度、稳定(沿地基面和深层滑动面)安全度和某连拱坝的稳定、强度与抗裂安全度;得出重力坝的安全度由强度控制,某连拱坝的安全度由抗裂和强度控制的结论.

The check ofrthe atctural safety of a dam that has worked for many years is of significance to the monitoring of the opeEation of the dam. in this paper the foundamental principle is proposed to apply the improved JC method to checking the stability, strength and crack resistance of concrete dams on the basis of prototype observation data. The selection of principal stochastic variables, failure patterus, the selection of intital values for reliability norms and iterative form of improved JC method are emphatically studied. These principles are applied to check the strength, stability (failure along foundation surface and deep sliding surface) of a gravity dam, and the stabiliy, strength and crackresistance of a multiple arch dam. The conclusion is made that the safety of the gravity dam is controlled by its strength, and the safety of the multiple arch dam by its crack-assistance and strength.