Simulation
Analysis on Thermal Stress of ShuangHe Ach Dam in Consideration of Contact
Friction Characteristic of Cracks
Ren Hao1, Li Tongchun1, He Xiangli2,
ZhaoLanhao1, Cheng Huifang1
1College of Water Conservancy & Hydropower Engineering, HoHai Univ.,NanJing,210098, China, E-mail:renhaohhu@163.com
2College of Water Conservancy&Civil Engineering,China Agriculture Univ.,Beijing,100083,China
Abstract:ShuangHe
Arch dam is located at debouch of ShuangHe river which is a branch of Guixi
river in Sichuan province, China. The characteristics of ShuangHe arch dam and other
measured calculate parameters will be introduced in detail in the full paper. The
dam was started building at June 1990, and finished on December 5, 1992. Shortly after construction in the middle December on
the condition of reservoir-empty, six vertical perforative cracks developed on
the downstream face of the arches. In January 1993 the cracks were propagating
with two cracks through the crest of dam and four through the foundation. The
total length of the cracks on downstream face exceeds 184 m, and the general width of the cracks is almost 1.5mm but the maximal width is 8mm. The longest crack is 54m long to the right section 2.7～3m of the arch crown. The total area of cracked sections
is about 900m2. In order to analyze the process of crack genesis and
expansion and the distribution laws of thermal stress and multiple stress of
the dam, a new simple and efficient method is proposed in this paper for
nonlinear simulation of thermal field and stress of ShuangHe ach dam from the
construction to operating period with considering the construction process of the
dam and temperature load. In the calculation mesh, the contact surface of pair
nodes is located at the actual measured position of the crack. A new effective
iterative method—Mixed Finite Element Method for contact problems with friction
and initial gaps is used for nonlinear emulation analysis of cracking process. The
calculated results conform to the actual measured data of the cracks, which indicate
that this method is completely feasible and efficient to analyze the crack
genesis and expansion of arch dam. The numerical results provide evidence for safety evaluation and reinforcement measures of the dam.
Keywords:
hydro-structures; actual measured
data; Mixed finite element; arch dam; simulation analysis
Fig.
1 Actual measured cracks on the
downstream face of the dam
Fig. 2 Opening
value of downstream after 702 days of pouring Fig. 3 Opening value of contact surfaces after 702 days of
pouring