【作者】 门玉明； 李寻昌； 张涛； 韩冬冬； 王海英；

【Author】 MEN Yuming LI Xunchang ZHANG Tao HAN Dongdong WANG Haiying (School of Geology Engineering and Surveying,Chang’an University;Research Institute of Safety technology,Chang’an University,Xi’an 710054)

【机构】 长安大学地质工程与测绘学院；

【摘要】 采用大型物理模型试验,对锚索抗滑桩的破坏模式进行了探讨,结果表明锚索抗滑桩有3种破坏模式,即桩身塑性铰破坏模式、锚索失效模式和桩周岩土体失效模式。对锚索抗滑桩与普通抗滑桩的破坏模式进行对比研究后表明:锚索抗滑桩有2个弯矩极值点,在滑面以上的弯矩极值点位于桩后,在滑面以下的弯矩极值点位于桩前;而普通抗滑桩的最大弯矩极值点只有一个,其位置在桩前,两者的破坏模式有较大的不同。提出了锚索抗滑桩设计中的几个重要问题,即:锚索抗滑桩的配筋,锚索的设计安全系数,锚索抗滑桩的施工安全,以及用有限元等数值方法进行分析时应注意的问题。重点对锚索抗滑桩与普通抗滑桩在内力及配筋上的差别进行了讨论,认为锚索抗滑桩应根据两个极值点的位置及弯矩,在桩后及桩前的一定范围内加强配筋,同时在锚索作用点,还必须满足抗剪强度对配筋的要求。如果按照普通抗滑桩的方法,只在桩前弯矩极值点范围内加强配筋,必然存在较大的安全隐患。更多还原

【Abstract】 The failure mode of anchor pile is discussed by using large physical model experiment,and the results show that three failure modes of the anchored anti-slide pile are plastic hinge failure mode of pile body,anchor failure mode and failure mode of soil around the pile.According to the comparative study of failure modes about anchor pile and common anti-slide pile,the research results show that they have bigger difference in failure mode.There are two extreme points of moment in anchor pile.The one above the sliding surface is in the behind the pile;the other below the sliding surface is in the front of pile.While common anti-slide pile only has one moment extreme point, and lies in the front of the pile.Several important issues in the design of anchor pile are put forward,namely:reinforcement of anchor pile,the safety factor of design of anchor cable,the safety construction of the anchor pile,and some problems which should be paid attention to analyze by the finite element numerical methods.The difference in the internal force and reinforcement between anchor pile and common anti-slide pile are discussed comprehensively. Basing on the positions and the values of two extreme points of bending moment,the anchor pile should be rein- forced in the front of the pile and in the behind of the pile,within the scope of certain.And the working point of the anchor should meet the shear strength for reinforcement requirements.If the steel reinforcement in the front of the pile is strengthened,just according to the method of common anti-slide pile,there will be greater security hidden danger in the structure.更多还原