In the considering problem usual tasks of designing ground dams (evaluation of filter strength, compressibility and ground permeability) are overlaid by new tasks, that have never touched upon earlier, that provide reliability of earth dams under extreme conditions and that are exposed by new additional forces such as intensive deformation and curvature of base. Here are dependences allowing determination of accepted values of earth surface deformation of ground dams on undermined territories. Using this methodology, you can compute required constructively technologic protection measures. Solution of such problems as predicting behavior and degree of reliability from external influence of a dam at given expected deformations, - can be brought into action. Prediction of conventional dams reliability may been carried out without underworking.
Abstract. This article provides estimates the parameters of protection from cracking dam due to volume compensation method. This article discusses the method of compensation dam volume. This method allows calculating the settings of security causing cracks the dam. Presents graphs of horizontal deformations of elongation calculated surface along the length of the construction and in time. Showing horizontal stress distribution diagram in the ground around the pile in plan and in section. Given all the necessary formulas for the method of compensation of the dam volume.
According to the authors the lack of evaluation methods for efficiency of pile behavior leads to an increased degree of randomness in the selection of type, material, shape and placement of piles, and, as a consequence, to overspending the material, energy, labor costs and, respectively, to more expensive construction. The work is devoted to the determination of the efficiency of piles of various cross-sectional forms (round, square, cross- shaped, T-shaped and double tee forms). A number of methods and criteria for quantitative evaluation of the efficiency of piles were proposed. Furthermore, the results of studies of the pile efficiency depending on the driving depth at the above-mentioned forms of cross-sections were given. Researches have shown that quantitative values of pile efficiency are approximately the same for the following forms for round and square cross-section; for T-shaped and double tee; and the are exactly the same for cross-shaped and T-shaped cross-section. Analysis of considered piles forms showed that maximum efficiency was achieved under the minimum depth of 2 meters, and then it gradually decreased. Also there was found an anomaly: at a depth of 10 meters the efficiency of cross sections with the tabs (III, IV, and V-shaped branchy) again begins to rise slowly. The results allow us to optimize more accurately the selection of the pile component in the foundation design
Magazine of Civil Engineering, №4, 2012Булатов Г.Я., Гатанов Д.С. Надежность грунтовых плотин на сложных основаниях Надежность грунтовых плотин на сложных основаниях К.т.н., доцент Г.Я. Булатов; инженер Д.С. Гатанов*, ФГБОУ ВПО Санкт-Петербургский государственный политехнический университет Ключевые слова: надежность гидротехнических сооружений; трещинообразование; трещиностойкость; подработка территории; грунтовая плотина; деформации основания Вопросом надежности грунтовых плотин, в том числе и на сложном основании, занимались многие исследователи. Тем не менее, проблема защиты грунтовых плотин от опасного воздействия подземных горных работ остается достаточно сложной и малоизученной и по настоящее время. Это положение объяснятся как ее новизной, так и особенностями конструкций и условий работы данного типа сооружений: возможно возникновение трещин при наличии растягивающих напряжений в грунтах. Допущение же трещин ограниченных размеров, хотя принципиально и применимо в расчетах прочности грунтовых плотин, но до настоящего времени не имеет достаточно надежных решений.
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