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为研究在非对称荷载作用下土体劈裂注浆压力,基于扩孔理论和统一强度准则并考虑非对称荷载的作用,建立基于扩孔理论的劈裂注浆启劈压力分析模型,推导出浆泡周围塑性区土体的应力场、位移场、塑性区半径以及启劈注浆压力的理论解答,并以工程算例进行论证。结果表明,考虑对称荷载作用下的启劈注浆启劈压力较考虑非对称荷载作用下的值要大,对称荷载作用下的分析方法低估了塑性区半径;无论是柱形劈裂还是球形劈裂,当K 0 1时,启劈压力会随着K 0的增大而增大,塑性半径会随着K 0的增大而明显减小;当K 0 1时,启劈压力会随着K 0的增大而减小,而塑性半径的变化是有限的。预先了解土体的初始应力条件对正确的确定劈裂注浆启劈压力至关重要,可为劈裂注浆的设计和施工会提供更加完善的理论依据。
In order to study the fracturing grouting pressure under asymmetric load, based on the reaming theory and uniform strength criterion and considering the effect of asymmetric load, a fracturing grouting pressure analysis model based on reaming theory was established, The stress field, the displacement field, the radius of the plastic zone and the theoretical solution of the grouting pressure in the plastic zone around the grout are also demonstrated by engineering examples. The results show that considering the symmetric load Kaiqin grouting Qi split pressure than considering the value of asymmetric load is larger, under the symmetrical load analysis underestimated the radius of the plastic zone; both the cylindrical splitting or ball split When K 0 1, the cracking pressure will increase with the increase of K 0, and the plastic radius will decrease obviously with the increase of K 0. When K 0 1, the cracking pressure will increase with K 0 1 K 0 increases and decreases, while the change of plastic radius is limited. It is very important to know the initial stress of soil beforehand to correctly determine the pressure of splitting grouting, which will provide a more complete theoretical basis for the design and construction of splitting grouting.