依据抛石爆破挤淤筑堤的淤泥强扰动机理,采用有限元方法,建立堤头爆破有限元数值计算模型,对抛石爆破挤淤筑堤的过程进行模拟.模拟结果与探地雷达实测结果的对比表明:首次堤头爆破后的断面形态、石舌下沉深度和延伸长度与探地雷达的实测结果基本吻合,表明抛石爆破挤淤筑堤的淤泥强扰动机理可行,对爆破后扰动区域的划分和扰动强度的假定也是合理的.以深圳前海外海堤建设工程为例,利用抛石爆破挤淤筑堤的淤泥强扰动机理计算挤淤时的断面形态,模拟结果与实测结果很接近,再次验证了抛石爆破挤淤筑堤的淤泥强扰动机理的合理性.%Based on the soft clay strongly disturbed mechanism of back filling rocks and explosion replacement, the finite element model of the explosion in the head of the sea dike was established, the process of the construction of the sea dike by back filling rocks and explosion replacement methods was simulated by finite element simulation method. The section shape of the sea dike, the sinking depth and extension length of the stone tongue after the first explosion in the head of the sea dike were calculated. These simulated results are basically consistent with the GPR inspecting results, which indicates that the soft clay strongly disturbed mechanism of back filling rocks and explosion replacement is feasible, the dividing of the disturbance zone and the supposition of the disturbance strength of the soft clay after explosion is reasonable. Taking the construction of the outside sea dike in Shenzhen Qianhai as an example, the section shapes of the outside sea dike were calculated using the soft clay strongly disturbed mechanism of back filling rocks and explosion replacement. The simulated results are very close to inspecting results, which proves once again the rationality of the soft clay strongly disturbed mechanism of back filling roeks- and explosion replacement.
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