CAJ | 학술논문

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.
점도시평개찬공관주장니장성능적중요삼수지일.유우찬공관주장장경대,니장순배속도저,전절속솔저,평개석유찬정화지질감탐니장류변성능적방법불괄합평개찬공관주장니장점도.수선분석료찬공관주장순배속도,추출기전절속솔분포;연후분석료선전점도계적전절속솔,제출료저전속적점도계경괄합평개찬공관주장니장;최후추도출료소성점도、유효점도화동절력적계산공식,대준학평개찬공관주장니장구유중요이론화실천의의.
@@@@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 rheological 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.