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| Research on the Design of Deep Cut Engineering in Saturated Silty Fine Sand Stratum |
| CHEN Hai-jun |
| (China Railway Eryuan Engineering Group Co. Ltd，Chengdu，Sichuan 610031，China) |
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Abstract Abstract : Research purposes : Silty fine sand stratum is characteristic of high permeability，weak cohesion，poor self - stability. In the saturated state，such character would aggravate the negative on engineering. The deep cut slope will be poor of stability in saturated silty fine sand stratum， and there are often accidents of water inflow and collapse in the process of cutting excavation. Under the negative effects of ground structure restrictions，7 degree earthquake zone，high groundwater level，saturated fines sand stratum，the economy and rationality of the seep cut design is the main purpose of this research. Research conclusions : ( 1 ) When general conditions (earthquake) and saturated conditions superimposed， safety declines and instability of slope aggravates. (2) After multi - program comparison，retaining structure of pile - slab wall is the optimum choice. (3 ) Churning pile cofferdam has significant effects on cutting off the groundwater out of the pit and ensuring construction safety. (4) Foundation reinforcement and subgrade bed closure are key factors to a successful design. (5)The research results could be referred to foundation pit in the similar conditions.
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Received: 05 September 2016
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2016, Vol. 33 
