Despite the fact that cascade reservoirs are built in a large number of river basins nowadays, there is still an absence of studies on sequential embankment dam-break in cascade reservoirs. Therefore, numerical simulations and risk analyses of cascade reservoir dam-break are of practical engineering significance. In this study, by means of contacting the hydraulic features of upstream and downstream reservoirs with flood routing simulation (FRS) and flood-regulating calculation (FRC), a numerical model for the whole process of cascade reservoir breaching simulation (CRBS) is established based on a single-embankment dam-break model (Dam Breach Analysis—China Institute of Water Resources and Hydropower Research (DB-IWHR)). In a case study of a fundamental cascade reservoir system, in the upstream Tangjiashan barrier lake and the downstream reservoir II, the whole process of cascade reservoir dam-break is simulated and predicted under working schemes of different discharge capacities, and the risk of cascading breaching was also evaluated through CRBS. The results show that, in the dam-break of Tangjiashan barrier lake, the calculated values of the peak outflow rate are about 10% more than the recorded data, which are in an acceptable range. In the simulation of flood routing, the dam-break flood arrived at the downstream reservoir after 3 h. According to the predicted results of flood-regulating calculations and the dam-break simulation in the downstream reservoir, the risk of sequential dam-break can be effectively reduced by setting early warnings to decrease reservoir storage in advance and adding a second discharge tunnel to increase the discharge capacity. Alongside the simulation of flood routing and flood regulation, the whole process of cascade dam-break was completely simulated and the results of CRBS tend to be more reasonable; CRBS shows the great value of engineering application in the risk assessment and flood control of cascade reservoirs as an universal numerical prediction model.

To establish the mathematic model of the constitutive relation and failure criteria of plastic concrete under true triaxial compressive stress, uniaxial compressive strength and true triaxial compressive strength of plastic concrete under three kinds of confining pressures with a size of 150 × 150 × 150 mm3 and a curing age of 540 days were tested, and the elastic modulus of plastic concrete with a size of 150 × 150 × 300 mm3 and a curing age of 90 days was tested. Based on the database, under uniaxial compressive stress tests and true triaxial compressive stress tests, the mathematic model of constitutive relation and the failure criteria of plastic concrete were investigated. It was observed that the strength of plastic concrete increased with confining stress. The mathematic model of constitutive relation in the form of the quartic polynomial is in good agreement with measured data. The general equations of failure criteria based on the octahedral stress-space under true triaxial compressive stress in the form of quadratic polynomial are well-fitting with experimental data. The mathematic model of constitutive relation and failure criteria of plastic concrete could provide the basis for a numerical simulation analysis of plastic concrete under true triaxial compressive stress, as well as promote the engineering application of plastic concrete.

Real-time traffic assignment for route guidance is put under the framework of model predictive control, which optimizes the routes based on the real-time feedback and prediction information of road network. In this framework, particle filter is utilized to estimate the statistic distribution of traffic flow of links without detection sensors based on the position and speed information of navigated vehicles on those links and the prior information of traffic flow of links with detection sensors. The chance constrains and Bayes-based route prediction are incorporated into the optimization model so that the stochastic characteristics of traffic needs, propagation and driver's decision-making behavior can be compensated in the route optimization. To check the chance constraints, the min-max characteristic points are used to fit the curve of stochastic traffic propagation process with stochastic needs to avoid the exponential increase of combination calculation. The genetic algorithm is utilized for the optimization with feasible-direction-search crossover and mutation to improve the evolution efficiency, combined with the traffic simulation in the mean sense with the compensation of stochastic parts of traffic flow data to evaluate the performance of real-time traffic assignment. The simulation results demonstrate the effectiveness of traffic navigation predictive control.

Based on the FLAC2D finite difference software, We can use strength reduction theory to gained the stability factor of the 48 soil slopes under the different conditions, Grey Correlation Analysis Method of the Grey System Theory is employed to analyze the sensitivities of factor influencing slope stability. The matrix of correlation data is setup, the elements of which are transformed to dimensionless parameters. The grey correlative factors and grey correlative degrees which respect to the influencing factor and the slope stability factor are computed, and the sensible factors influence slope stability are decided. The results show that the cohesion of the soil. The density and the internal friction angle are the most sensitive factors to the slope stability, and the dilatancy angle, slope angle and the slope height are taken second place, which provide a reference to the reasonably and effectively design of the actual slope works.

It has important and practical significance for realizing the resource-dependent city Ordos’ future coordinate and sustainable development that studying it’s industrial structure, analyzing its rationality problem. Rationality of Ordos’ industrial structure is analyzed based on the recent 5 years’ data of three national industrial structure, using shift-share method, taking Inner Mongolia autonomous region and China as references respectively. The results show that most industrial momentums grow well and have competitive ability, but the proportion of its dominant class industry in three industrial structures is small, which is not reasonable, needing adjustment and further configuration. At last, according to problem in the process of Ordos’ three industrial structure development, the adjustment and development proposal are put forward including agriculture and animal husbandry, coal industry , finance, tourism, modern services and other industries.