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水平旋喷桩施工期间,大量高压流体注入土层,引起土层内部产生较大的膨胀作用,致使周围一定区域的土体发生变形。水平旋喷桩施工引起土体变形可以归结为压力膨胀和体积膨胀共同作用的问题。依托单根水平旋喷桩施工的现场实例,建立了水平旋喷桩施工引起土体变形的数值模型。将水平旋喷桩施工引起的土体变形问题简化为圆孔的膨胀问题,可以统筹考虑注浆压力和注浆流量的影响。首先需要确定注浆压力的影响半径和注浆流量引起的体积膨胀比,然后可以通过数值模型计算膨胀引起的土体变形。数值分析结果与现场实测值的对比表明,当注浆压力影响半径为成桩半径的6倍时,数值计算结果与现场实测值吻合较好。
During the construction of horizontal jet grouting pile, a large amount of high-pressure fluid is injected into the soil layer, causing a large expansion effect inside the soil layer, resulting in deformation of the soil body in a certain area around. The deformation of soil due to horizontal jet grouting pile construction can be attributed to the problem of the combined effect of pressure expansion and volume expansion. Relying on the single instance of horizontal jet grouting pile construction, a numerical model of soil deformation caused by horizontal jet grouting pile construction is established. The problem of soil deformation caused by the construction of horizontal jet grouting pile can be simplified to the problem of bulge hole expansion. The effect of grouting pressure and grouting flow can be considered in an integrated manner. First of all, it is necessary to determine the influence radius of grouting pressure and the volume expansion ratio caused by grouting flow. Then the deformation of soil caused by expansion can be calculated by numerical model. The comparison between numerical analysis and field measurements shows that when the radius of grouting pressure is 6 times the radius of pile, the numerical results agree well with the measured data.