The affect of shield operation parameters and overcut On existing tunnel in multi-level crossing tunnels
محل انتشار: نهمین کنگره بین الملی مهندسی عمران
سال انتشار: 1391
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 1,308
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شناسه ملی سند علمی:
ICCE09_523
تاریخ نمایه سازی: 7 مهر 1391
چکیده مقاله:
The development of transportation in large cities needs some new tunnels to be designed and constructed nearby existing tunnels. In this study a metro tunnel will be excavated by EBP shield at different level from the sewage tunnel and it‟s beneath. Both the relative position of tunnels and the excavation procedure of new tunnel effect the soil displacement and existing tunnel lining. Hence, the effects of shield operation parameters (face pressure, grouting pressure), overcut between shield skin and surrounding soil are studied using a 3D finite difference analysis. The results showed that the largest interaction effects occur at the invert of existing tunnel. Analysis result showed the effect on existing support system in longitudinal section of tunnel is larger than cross section. Most effect on support occurs when ground moves into overcut space. However, these affects decrease significantly with increasing the face pressure, grouting pressures and bentonite flow into steering gap between shield skin and surrounding soil.
کلیدواژه ها:
نویسندگان
T Alemzadeh
department of mining engineering, Isfahan university of technology