以地表沉降量作为沥青路面破损控制标准的研究

按照现行的规范,沥青路面破损状况指数PCI(Pavement Condition Index)是根据路面破损情况,将路面质量分为优、良、中、次、差5个等级来对路面状况进行评价的,是对已经出现破损的路面进行质量评价的方法,属事后调查,破损面积均以实际量测数据来计算.而预测城市地铁浅埋暗挖车站施工对沥青路面造成破损的状况属事前预测,因此破损面积需要通过理论计算获得.另外,规范中制订的路面破损状况评价标准也可以作为城市地铁车站浅埋暗挖施工造成沥青路面破损的控制标准.本文采用PECK理论模拟计算地铁车站暗挖施工导致沥青路面的破损,建立风险事件导致的地表最大沉降值与路面状况指数PCI之间的数值关系,作为沥青路面破损控制的标准.

Research on the Damaging Control Criterion of Blacktop Due to Underground Tunnel Construction

According to the current regulation,PCI(Pavement Condition Index)evaluated the blacktop condition through considering the damaging situation of the blacktop.The blacktop quality was classed into five grades as Best,Better,Good,Bad and Worse in this method.This method belongs to the post-damage evaluation,which can evaluate the quality of the blacktop damaged.The damaged area was calculated by using the real measured data.On the contrary,the forecast of the blacktop's damaging condition due to underground tunnel construction belongs to the pre-forecast,therefore,the damaged area needed to be calculated with theoretical arithmetic.In addition,it is feasible that the Evaluating Standard of the Damaged Pavement Condition in Regulation could be regarded as the control standard of the damaged blacktop condition due to the underground tunnel construction.In this paper,the PECK theory was applied to the calculation of the damaged blacktop area.The numerical relationship was established between the maximum subsidence value induced by the construction risk and PCI,and the relationship was regarded as the control standard of the damaged blacktop condition due to the underground tunnel construction.