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水平旋喷桩施工期间,大量高压流体(水或水泥浆)注入土层,引起土层内部产生较大的膨胀作用,致使施工周围一定区域的土体发生变形。通过将水平旋喷桩施工过程模型化,基于Verruijt提出的半无限平面内圆孔扩张引起变形的弹性解答,提出了单根水平旋喷桩施工引起土体变形的实用计算方法。研究分析了单根水平旋喷桩施工引起土体应力状态的变化特性,给出了塑性区边界应力的计算公式;考虑水平旋喷施工参数和土性参数,应用能量原理提出了塑性区半径的计算公式。应用所提出的计算方法对水平旋喷桩施工实例进行计算分析,计算值与实测数据的对比结果验证了该计算方法的合理性。
During the construction of horizontal jet grouting pile, a large amount of high-pressure fluid (water or cement slurry) is injected into the soil layer, causing a large expansion effect inside the soil layer, resulting in the deformation of the soil body in a certain area around the construction. Based on the modeling of the construction process of horizontal jet grouting pile, based on Verruijt’s elastic solution to deformation caused by the expansion of circular hole in the semi-infinite plane, a practical calculation method of soil deformation caused by single horizontal jet grouting pile construction is proposed. This paper analyzes and analyzes the changing characteristics of soil stress state caused by single horizontal jet grouting pile construction and gives the formula for calculating the boundary stress of plastic zone. Considering the construction parameters and soil parameters of horizontal rotary jet grouting, the radius of plastic zone Calculation formula. The application of the proposed calculation method of horizontal jet grouting pile construction example is calculated and analyzed, the calculated value and the measured data comparison results verify the rationality of the calculation method.