【摘要】 本文基于絮凝发育图式,提出浆体在宾汉极限切应力行将呈现时,亦已具有恒大于零的临界粒间粘着力(τ_Fk)的观点。换言之,宾汉极限切应力τ_B的大小取决于形成絮网结构时的粒间粘着应力τ_F与τ_<sub>Fk之差值的大小。并由此建立了包含有流型转化因素（临界含沙浓度）的宾汉极限切应力计算公式。并经大量实测资料验证表明,公式与实测资料吻合较好;其次还利用实测资料进一步对临界含沙浓度的大小进行了测算,获得了有益的认识。更多还原

【Abstract】 On the basis of the process of flocculent development, the point of view is proposed that the critical cohesive stress ( τFk ) between particles is absolutely greater then zero as the yield stress of slurry appears, or in other words, the value of the Bingham yield stress ( τB ) depends on the difference between τFk (which is the cohesive stress between particles after the flocculent structure appears) and τFk. Therefore, the formula of the Bingham yield stress is esablished including the factor of flow pattern change (the critical concentration).The formula is examined by a lot of observed data, and it shows to be in good agreement with these actual data.Then, the magnitude of the critical concentration of sediment is determined by the observed data, and some useful knowledge is obtained.更多还原