Stability Analysis Of Ogee Section At The End Of Discharge Trough Of Spillway Of Earth-rock Dam On Deep Soft Foundation

With the rapid development of water construction, topographic and geologic conditions which are suitable for the construction of the bank slope spillway become more and more scarce, therefore, the spillway has been laid out on the earth-rock dam in engineering. The ogee section of dam spillway of the earth-dock dam is often arranged at dam toe of section which has maximum dam height. The related processing is required, if the place belongs to the deep soft foundation. The pile foundation belongs to deep foundation, which can be used to transfer loads of superstructure to the deeper underground dense soil layer, so the requirements of bearing capacity and settlement are met. The paper deeply studied the processing of deep soft foundation which provides ground to ogee section of spillway by using bored pile, which is capable of making deep soft foundation meet stability requirements. Therefore the safety operation of ogee section is ensured.The all balance equations stabilizing ogee section of spillway were provided by means of comprehensive analyses of force condition of ogee section and bored pile. Afterwards, the calculation expressions of the depth and bearing capacity of bored pile and unit width discharge were deduced by solving the above equations. The stability safety factor expression was obtained according to this force relations. The experimental results of the method proposed at this paper satisfied the stability requirements by calculating the bearing capacity and depth of bored pile and stability safety factor. So the theoretical calculation formulas deduced accorded with the engineering practice, which can offer some reference for the similar engineering design.