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 negative frictional force 负摩擦力(9)负摩阻力(1)负摩擦阻力(0)
 负摩擦力
 Discussion on negative frictional force of big-diameter pile and its shape & properties 大直径桩的负摩擦力及性状的探讨 短句来源 Calculation of Negative Frictional Force on Freezing Shaft Liner- 作用在冻结井壁上负摩擦力的计算 短句来源 According to the analysis for failure reasons of vertical shaft wall in Linhuan Coal Mine,its main reason is longitudinal load produced by negative frictional force. 分析临涣煤矿区竖井井壁破坏的原因，主要是由负摩擦力产生的纵向荷载引起的。 短句来源 Failure Analysis of Vertical Shaft wall and Determination of Maximum Negative Frictional Force 竖井井壁破坏分析和最大负摩擦力的确定 短句来源 By analyzing frictional mechanism of big-diameter pile,it gets stress model of the pile’s side resistance and gives relation between loads on top of pile and subsidence under negative frictional force as well as expressional formula of stress ratio between pile and soil. 通过对大直径桩的摩擦机理分析 ,得出桩的侧摩阻力的受力方式 ,总结出了在受负摩擦力情况下桩顶荷载与沉降的关系以及桩土应力比的表达式 短句来源 更多
 负摩阻力
 Discussion of negative frictional force of pile 浅议桩的负摩阻力 短句来源

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 The shaft crib is a foundation for supporting the shaft. Currently,in designing the foundation for all kinds of shaft sinking methods it is assumed that the weight of upper part of the shaft lining is partially supported by the crib and the rest weight of the lining is transferred by the frictional force to the surrounding rocks.The authors point out that this assumption can not be applied to a shaft sunk by freezing method, because when the frozen soil melts, it subsides and is not able to support the shaft... The shaft crib is a foundation for supporting the shaft. Currently,in designing the foundation for all kinds of shaft sinking methods it is assumed that the weight of upper part of the shaft lining is partially supported by the crib and the rest weight of the lining is transferred by the frictional force to the surrounding rocks.The authors point out that this assumption can not be applied to a shaft sunk by freezing method, because when the frozen soil melts, it subsides and is not able to support the shaft lining. On the contrary, it will give the shaft lining a downward(negative) frictional force. The paper lists the field observation data of the pressure change under the shaft seat when a shaft sunk by freezing method is subsiding.The value of negative frictional force is calculated. A formula is derived for calculating the positive frictional force produced between the bed rock and the shaft lining. Finally, the method for selecting the correct position of the shaft crib in designing shafts sunk by freezing method is proposed. 壁座是支承井筒的基础,目前设计壁座时,不论采用何种施工方法,都假定壁座只承担其上部井筒的部分重量,井筒的其余重量靠摩擦力传给与井壁紧密接触的围岩。本文认为用冻结法施工井筒时,这种假定是错误的。作者指出在冻土段内的井筒,当冻土融化下沉时,围岩不但不能支承井筒,相反,在下沉过程中还将传给井筒向下的负摩擦力。文中提供了某冻结法施工的井壁壁座下的压力,在冻土融化过程中的变化情况的实测资料。并用理论公式推算了负摩擦力的量值,推证出基岩中围岩对井筒的正摩擦力计算公式。对于在设计冻结法施工的井筒时,应如何正确地选择壁座位置的问题也提出了建议。 The shaft crib is a foundation for supporting the shaft. Currently,in designing the foundation for all kinds of shaft sinking methods it is assumed that the weight of upper part of theshaft lining is partially supported by the crib and the rest weight of the lining is transferred by the frictional force to the surrounding rocks. The authors point out that this assumption can not be applied to a shaft sunk by freezing method, because when the frozen soil melts, it subsides and is not able to support the shaft... The shaft crib is a foundation for supporting the shaft. Currently,in designing the foundation for all kinds of shaft sinking methods it is assumed that the weight of upper part of theshaft lining is partially supported by the crib and the rest weight of the lining is transferred by the frictional force to the surrounding rocks. The authors point out that this assumption can not be applied to a shaft sunk by freezing method, because when the frozen soil melts, it subsides and is not able to support the shaft lining. On the contrary, it will give the shaft lining a downward(negative)frictional force. The paper lists the field observation data of the pressure Change under the shaft seat when a shaft sunk by freezing method is subsiding. The value of negative frictional force is calculated. A formula is derived for calculating the positive frictional force produced between the bed rock and the shaft lining Finallgy,the method for selecting the correct position of the shaft crib in designing shafts sunk by freezing method is proposed. 壁座是支承井筒的基础,目前设计壁座时,不论采用何种施工方法,都假定壁座只承担其上部井筒的部分重量,井筒的其余重量靠摩擦力传给与井壁紧密接触的围岩。本文认为用冻结法施工井筒时,这种假定是错误的。作者指出在冻土段内的井筒,当冻土融化下沉时,围岩不但不能支承井筒,相反,在下沉过程中还将传给井筒向下的负摩擦力。文中提供了某冻结法施工的井壁壁座下的压力,在冻土融化过程中的变化情况的实测资料。并用理论公式推算了负摩擦力的量值,推证出基岩中围岩对井筒的正摩擦力计算公式。对于在设计冻结法施工的井筒时,应如何正确地选择壁座位置的问题也提出了建议。 After a completion of a freezing shaft liner construction, due to the thaw of freezing soil and subsidence of ground, a first negative frictional force was occured. A second frictional force was occured due to coal mining, mine water drainage, water table dropping in overburden, ground surface subsidence, ground compression and subsidence. Due to the seasonal exchanges and high temperature in summer, there is a temperature stress in the shaft liner and there is a negative frictional force... After a completion of a freezing shaft liner construction, due to the thaw of freezing soil and subsidence of ground, a first negative frictional force was occured. A second frictional force was occured due to coal mining, mine water drainage, water table dropping in overburden, ground surface subsidence, ground compression and subsidence. Due to the seasonal exchanges and high temperature in summer, there is a temperature stress in the shaft liner and there is a negative frictional force in the shaft liner. The present calculation of the frictional force is based on a pillar foundation and has some disadvantages. It is assumed that the negative frictional force along the surface of the freezing shaft liner are evenly distributed. Except the other loads, it only calculated the net weight of the shaft liner. It is to define that the failure stress due to the failure depth of overburden and bidirectional stress of shaft liner concrete is 1. 2 higher than the unidirectional stress. The negative frictional force at the shaft failure is calculated with a reverse calculationa method. Based on 10 failure shaft liner in Huibei and Datun coal mining areas as examples. records of certain data and in consideration of a safety figure, it has defined a negative frictional force for mine shaft liner in Huibei, Datun and Xuhui coal mining areas by using math statistical method. The negative frictional force can be used for the design of mine shaft liner. 论述立井井壁纵向负摩擦力存在的依据,目前计算负摩擦力以桩基为基础的计算方法存在欠缺,根据一定假设、井壁自重应力、井壁破坏深度和破坏应力,反算法推算出负摩擦力,再用数理统计和考虑适当偏安全,求出淮北、大屯和徐淮矿区立井井■摩擦力的建议值。 << 更多相关文摘
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