桥台填土引起的基底附加应力的研究

Research on Additional Stress of Fill on the Abutment

引起桥台不均匀下沉的因素很多,但桥台填土是其中最重要的因素之一。因此对桥台填土产生的附加应力进行深入研究是很有实际价值的。传统计算方法是应用规范,进行查表确定附加应力系数而后进行计算。从74到07的所有规范看,均沿用相同的计算方法。但规范中的计算方法具有一定的时代局限性,是在特定条件下(规定了路基宽度,边坡,锥坡及基础形式)、特定的计算能力(计算机还没得到广泛应用)下制定的。以现在道路发展状况看,规范中的附加应力系数有很多不足。因此,利用土力学中的叠加方法,针对不同路基情况进行深入研究是很有必要的。在此通过计算分析,提出计算桥台附加应力的适用的计算方法。

Factors are evenly numerous that abutments does not sink,but one of the most important factors is filling on the back of abutment.So we have further investigated that fill out to abutment additional stress that has real value very much.The traditional computing technology employs the norm,check the watch confirms additional stress coefficient and calculates.By the look of norms of 74 to 07,continue to use the same computing technology.The computing technology in normal that has certain era limitation,it had been made under the specified conditions（it have stipulated the width of road bed,the slope,the slope of the awl and basic form）,in particular computing capability（The computer has not been used widely yet）.According to state of development of the road now,there are many insufficient that additional stress coefficient in the norm.So,utilize the method of superposing in mechanics of soil,it is very necessary that further investigate to different situation of road bed.we propose the method of calculating of additional stress of abutment by computational analysis.