Analysis and Discussion of Typical Soft Foundation Diseases at Bridgehead
Soft foundation bridgehead diseases are very common in road engineering.The improper treatment of soft foundation in the construction period often leads to the continuous occurrence of various diseases in the operation period and causes the high maintenance costs.And also it is difficult to eradicate the diseases.Taking the treatment of a bridgehead project in Zhuhai,which has been open to traffic for more than six years as an example,by the means of field measurement,survey,foundation detection,laboratory test and numerical simulation,the development degree and causes of bridgehead diseases are comprehensively analysed.The analysis results show that the overall settlement of the soft foundation section at the bridgehead is large and the settlement is uneven and significant.The physical and mechanical properties of the underlying soft soil layer have not been improved during the operation period.The PHC pipe piles in the layers are broken,dislocated and inclined.The measured settlement of subgrade exceeds the settlement calculated by the design theory,and the subgrade has serious lateral displacement.
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