钻孔灌注桩泥浆流变性能评价方法探讨  

Discussion of Evaluation on Mud Rheological Property Used for Bored Pile

作　　者：于进洋[1] 白晨光[2] 张新明[1] 郑秀华[1] 

机构地区：[1]中国地质大学〈北京〉工程技术学院,北京100083 [2]中国建筑股份有限公司技术中心,北京101300

出　　处：《探矿工程（岩土钻掘工程）》2013年第4期75-77,共3页Exploration Engineering:Rock & Soil Drilling and Tunneling

摘　　要：粘度是评价钻孔灌注桩泥浆性能的重要参数之一。由于钻孔灌注桩桩径大,泥浆循环速度低,剪切速率低,评价石油钻井和地质勘探泥浆流变性能的方法不适合评价钻孔灌注桩泥浆粘度。首先分析了钻孔灌注桩循环速度,推出其剪切速率分布;然后分析了旋转粘度计的剪切速率,提出了低转速的粘度计更适合评价钻孔灌注桩泥浆;最后推导出了塑性粘度、有效粘度和动切力的计算公式,对准确评价钻孔灌注桩泥浆具有重要理论和实践意义。Viscosity is one of the important parameters to evaluate the mud property of bored pile. Because of the large pile diameter, low mud circulation velocity and low shear rate, the methods of evaluating mud theological property of petroleum drilling and geological exploration is not suitable for evaluating bored pile. This paper firstly analyzes the circulation velocity of bored pile to calculate the shear rate distribution ; then analyzes the shear rate of rotary viscometer and suggests that vari- able speed viscometer with low rpm is more suitable to evaluate the mud of bored pile ; the plastic viscosity, effective viscos- ity and yield point formulation under low shear rate were finally deduced.

关 键 词：钻孔灌注桩 泥浆 流变性能 粘度 剪切速率 

分 类 号：TU473.14[建筑科学—结构工程]