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桥头跳车主要是由路桥的沉降差所致,而路桥沉降差的主要原因,是台后路基的沉降所产生的。一、路基沉降的原因(一)地基沉降由于桥涵通常位于沟壑地段,地下水位较高,且多属于软弱基础,在路基营运荷载的作用下,使地基产生压缩变形,形成地基沉陷。由于软弱地基一般都具有天然含水率高、孔隙比大、压缩性高、抗剪强度低、渗透系数小的特点,地基沉降更为严重,并且需要相当长的时间才能趋于稳定。
The bridgehead jumping is mainly caused by the settlement difference of the road and bridge, while the main reason for the poor settlement of the bridge and bridge is caused by the settlement of the subgrade behind the platform. First, the subgrade settlement causes (a) subsidence Because the bridge and culverts are usually located in the gully area, the groundwater level is high, and mostly belong to the weak foundation, under the action of roadbed loads, make the foundation compressive deformation, the formation of foundation settlement. As the weak foundation generally has the characteristics of high natural water content, large void ratio, high compressibility, low shear strength and low permeability coefficient, the foundation settlement is more serious and takes a long time to stabilize.