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为了研究桩锚支护结构与土相互作用的细观机理,采用离散元方法对基坑进行了数值模拟。分别模拟了无任何支护措施、单桩支护、排桩支护以及桩锚支护四种情况下的基坑变形过程,得到了相应的桩体变形。结果表明:桩锚支护在很大程度上削弱了基坑变形;锚杆对桩体上部水平位移起着很好的约束作用;锚杆刚度越大,在随桩体水平位移时,锚杆身与上部土体的挤压力越大,从而使得土体与锚杆的咬合力加大,有助于约束桩体的变形。
In order to study the meso-mechanism of the interaction between pile-anchor supporting structure and soil, the discrete element method is used to simulate the foundation pit. The deformation process of the foundation pit under four conditions without any supporting measures, single-support, row support and pile-anchor support are simulated respectively. The corresponding deformation of the pile is obtained. The results show that: the pile and anchor support weakens the deformation of foundation pit to a great extent; the anchor rod plays a very good restraint role on the horizontal displacement of the upper part of the pile; the greater the rigidity of the anchor rod, The greater the compressive force between the body and the upper soil, so that the bite force between the soil and the anchor rod increases, which will help to restrain the deformation of the pile body.