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为了研究路基不均匀沉降的控制指标,利用数值计算的方法,研究路基不均匀沉降的沉降梯度对基层底部附加应力的影响;并基于双层弹性连续体系,求解不均匀沉降在半刚性基层底部产生的弯拉应力,最后利用麦克劳林展开式进行简化。研究结果表明:利用沉降梯度作为路基不均匀沉降的控制指标,具有一定的局限性;而沉降梯度与沉降距离的比值,即一阶梯度,与弯拉应力之间存在一一对应的关系,可作为容许不均匀沉降的控制指标。对于我国典型的半刚性路面结构来说,不考虑车辆荷载时,路基不均匀沉降的容许一阶梯度可取为0.000 161 m-1。
In order to study the control indexes of uneven subgrade settlement, the influence of subsidence gradient caused by uneven subgrade settlement on the base additional stress is studied by means of numerical calculation. Based on the two-layer elastic continuous system, uneven subsidence is generated at the bottom of semi-rigid basement Of bending stress, and finally using McLaughlin expansion to simplify. The results show that: the use of settlement gradient as subgrade subsidence control index has some limitations; and the ratio of settlement gradient and settlement distance, ie, the first-order gradient, and the bending stress between the one-to-one relationship may be As a control index to allow uneven settlement. For a typical semi-rigid pavement structure in our country, the allowable first-order gradient of subgrade subsidence is 0.000 161 m-1 when vehicle load is not considered.