亭子口大坝深层抗滑稳定试验研究

Model Test of Stability against Deep Sliding in Tingzikou Dam

深层抗滑稳定一直是重力坝设计中的关键性问题。实际工程坝基岩体往往存在软弱结构面、缓倾角裂隙、断层等,这些不利结构面组合可能构成坝基内连续或断续的滑裂面,从而对坝基的深层抗滑稳定性造成严重威胁。为了给设计基础处理优化方案提供依据,并对数值分析进行验证,采用地质力学模型试验技术,研究亭子口表孔坝段深层抗滑稳定问题。试验分别进行基础处理和不处理2个方案的研究,对运行工况下大坝及基础关键部位位移场及规律进行分析,并得出超载作用下大坝及基础位移规律、破坏机理、滑动路径和抗滑安全系数。对基础处理前后的亭子口坝基深层抗滑稳定性及加固处理措施作出安全评价。

Stability against deep sliding of gravity dam design has been a key issue. In natural rock of many engineerings, there are often weak structure planes, gently-clipping fissures and faults in the dam foundation rock. The combination of these unsafely structural surfaces may constitute a continuous or discontinuous slip surface in the dam foundation, thus, brings a serious threat to the deep sliding stability of dam. In order to provide the basis for optimization scheme of foundation treatment, and to verify numerical analysis, we use geomechanical model test technique to study deep sliding stability of the spillway section of Tingzikou Dam. There were two programs with processing and without processing. On the basis of operating conditions of the dam, the displacement fields and law of the key parts in dam and foundation were analyzed, and the displacement development law, failure mechanism, sliding path and anti-slide safety factor under the overload were observed. Safety evaluation for deep anti-slide stability and reinforcement treatment measures for Tingzikou Dam foundation before and after treatment were made.