导弹无依托发射场坪极限承载力影响因素敏感性分析

摘要

为评估发射场坪的强度稳定性，提出研究发射场坪的极限承载力快速评估技术。在分析地基承载力计算模式的基础上，分析计算内聚力、内摩擦角以及上覆层厚度对极限承载力的敏感度，给出作业场坪极限承载力随敏感参数变化的规律；同时设计正交试验模型，并对承载力影响因素的敏感性做出合理分析。分析结果表明：上覆层和地基土体内聚力取值的变化对地基极限承载力的敏感性受内摩擦角取值影响，内摩擦角越小，内聚力敏感系数越大；上覆层厚度变化对承载力敏感性系数受土体内摩擦角取值的变化影响较小；土体内摩擦角取值变化对极限承载力的影响明显高于上覆层厚度变化以及内聚力变化对承载力的影响。%To evaluate the intensity stability of operation site, the fast evaluation technique is put forward to study the ultimate bearing capacity of launching site. Based on the analysis of bearing capacity computation pattern, the sensitivity expression of cohesion force, internal friction angle and super stratum thickness to limiting bearing capacity is analyzed and calculated, and the influence regularities of the ultimate bearing capacity of operation site, due to the sensitive parameters, is provided. Simultaneously, the influence factor sensitivity is analyzed reasonably by orthogonality test model. Analysis result shows, for the ultimate bearing capacity sensitivity which generated by cohesive force, which has the regularity that smaller internal friction angle will lead to bigger sensitivity coefficient. Comparably, the sensitivity to variable of super stratum thickness suffers less influence by the value of internal friction angle, and the influence degree which brought by the variable of internal friction angle is obviously higher than the variable of super stratum thickness and internal cohesive force.