Research On Settlement Prediction For High Filling Embankment And Earth Pressure Behind Abutments

With the construction of highway developing in the mountains, high filling embankment behind abutment will be inevitably encountered. The construction of high filling embankment behind abutment has many difficulties in technology, which involve the control of workable settlement, the problem of bump at bridge-head and the calculation of earth pressure behind abutment. High filling embankment behind abutment is always a critical project to the construction of the whole freeway. Considering its practical meaning, from the aspects of settlement prediction and earth pressure behind abutment, high filling embankment behind abutment is systematically studied in the thesis.At first, the settlement variable rule of high filling embankment is studied. Existing settlement prediction methods have their own adaptability. Peal curve prediction model of unequal time span is established to predict settlement of high filling embankment. Beside this, grey prediction model is also put forward that can consider the unequal span of observing time, the continuous renew of the settlement data and the influence of the loading of filling. The two methods are both applied in the settlement prediction of three section of Hengyang-Zaomupu freeway and Leiyang-Yizhang freeway. Because settlement data analysis needs too much time, video operating interface for settlement prediction of high filling embankment is developed. The interface is applied in the settlement prediction of practical project to prove its reliability. Based on finite element back-analysis procedure of Biot nonlinearity consolidation settlement, the sensitivity of the calculation parameters of E-v model and E-B model is analyzed. The solution of the problem of back-analysis is studied through practical projects.Based on settlement observation data and pavement condition survey of Leiyang-Yizhang freeway and Hengyang-Zaomupu freeway, the influence of different soils and different fill height on settlement stability time, workable settlement and pavement quality of high embankment is analyzed. Furthermore value standard for settlement control of construction of rigid pavement sub-base, base course and surface course is proposed. Through the mechanic analysis of approach slab, the relation of the length of void beneath slab and workable settlement is studied. At the same time, it deduce that allowable value standard of workable settlement is two times of...