نتایج جستجو برای: epb shield tunneling machine
تعداد نتایج: 293202 فیلتر نتایج به سال:
tunnelling through cities underlain by soft soil, commonly associated with soil movement around the tunnels and subsequent surface settlement. the predication of ground movement during the tunnelling and optimum support pressure could be based on analytical, empirical or the numerical methods. the commonly used earth pressure balance (epb) tunneling machines, uses the excavated soil in a pressu...
Tunneling-induced ground surface settlement is associated with many complex influencing factors. Beyond factors related to tunnel geometry and surrounding geological conditions, operational the shield machine are highly significant because of complexity shield-soil interactions. Distinguishing most relevant can be very difficult, for all seem affect tunneling-induced some degree, none clearly i...
Surface settlement is one of the key engineering issues during shield construction process. In order to accurately predict surface settlement, this paper proposes a new machine learning method based on relevance vector (RVM), principal component analysis (PCA), and particle swarm optimization (PSO). Taking Beijing Metro Line 6 as case study, PCA-PSO-RVM model used make prediction compared with ...
BACKGROUND de Quervain's disease is a condition in which there is pain in the radial styloid process caused by stenosing tenosynovitis of the abductor pollicis longus (APL) or/and extensor pollicis brevis (EPB) tendons in the first extensor compartment of the wrist. In this study we studied variations in the tendons of the EPB in the first extensor compartment and its site of insertion. METHO...
حفاری در مناطق شهری امری پیچیده و مخاطره آمیز است. یکی از مسایل مهم در حین عملیات ساخت تونل های مترو بررسی تاثیر مراحل حفاری بر نشست سطح زمین و مهار آن است. برای این منظور بیش تر از ماشین های فشار تعادلی زمین (epb) یا انواع دیگر سپرها استفاده می شود؛ در نتیجه می توان تا حد قابل توجهی جابجایی های ناشی از حفاری تونل را کاهش داد. در این مقاله خصوصیات گودی نشست تونل مترو در مسیر بلوار کریم خان زند ...
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