袖阀式劈裂注浆和动力固结法路基补强处理

结合工程实例,对道路下雨污水管槽回填密实度不满足设计要求而导致的路面开裂,采取袖阀式劈裂注浆法和动力固结法进行加固,并分析影响加固效果的原因以及总结值得吸取的经验教训。     

A method for structural damage detection considering scour depth under the pile-soil interaction

The structure of an offshore wind turbine accumulates damage during its service life, while its surrounding soil is continually scoured. However, the existing damage detection technique based on structural mode ignores scouring, which will cause damage misjudgment in engineering application. Therefore, the effect of scour depth on structural damage detection need to be studied urgently. In this paper, the pile and its surrounding soil are constructed into a vibration system, and the change of soil constraint state caused by scouring is reflected in structural mode. Based on that, a new structural damage detection method considering the pile-soil interaction is developed, which is suitable for engineering reality. Then, from a comparison between the calculated result and preset damage in the numerical simulations and model experiments, the proposed method is validated. The results show that the interference factors caused by scouring increase with the increase of scour depth, which causes the deterioration of damage identification effects gradually, and even masks the preset damage in the end. Finally, an optimized FE model based on the actual scour depth is presented, which reduces the number of interference factors and improves the effect of damage detection significantly.     

An improved method for estimating internal solitary waves force on small circular cylindrical structures

Theoretically calculation and laboratory experiments were performed to investigate the horizontal force exerted by internal solitary wave (ISW) on small circular cylindrical structures. Improvement in calculation of drag force and inertia force by introducing two-drag-coefficient method and spatial derivative of velocity into the calculation of force by eigenfunction was made based on systematically study on theoretical foundations. Particle image velocimetry (PIV) method and high precision force sensor were used to measure the velocity and force exerted by ISW, respectively. ISW waveform was traced by analyzing image frames follow grayscale threshold method. For the first time, components of horizontal force were calculated from PIV data, which show good agreement with theoretical one. Moreover, series comparisons between experimental data and calculational results were carried out to examine the proposed method. The results show ideal accuracy of the method and significant improvement comparing to the traditional method.