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深厚表土中的井壁与发生沉降或抬升的地层之间,由于相互耦合会产生力的作用。在采用注浆加固地层治理井壁破裂时,地层会产生抬升,而在注浆休止时,地层又会有一定的沉降,在地层的抬升和沉降过程中会对井壁的附加力产生一定的影响和改变。通过井壁上监测的附加应变的变化以及地层沉降位移的变化之间分析对比,数据曲线表明:地层沉降和井壁之间有良好的相关性,地层抬升时,井壁附加应变减小;地层沉降时,井壁附加应变增加。因此通过地表沉降测试数据能反映出井壁所受附加力的大小,对于没有埋设监测系统井壁,可以通过地表沉降数据来反应井壁附加力的大小,据此来预测井壁的安全状况。
Between the wellbore in the deep topsoil and the strata in which the subsidence or uplift occurs, the force generated by the mutual coupling will be exerted. When using the grouting to reinforce the formation to control the wall rupture, the formation will rise, and when the grouting stops, the formation will have some settlement. During the process of uplift and settlement of the strata, some additional force will be produced on the wall Impact and change. Through the analysis of the additional strain monitored by the borehole wall and the change of the settlement of the strata, the data curve shows that there is a good correlation between the settlement of the strata and the borehole wall, and the additional strain in the borehole decreases when the strata is raised. When settling, additional strain on the shaft wall increases. Therefore, the data of surface subsidence test can reflect the additional force exerted on the borehole wall. For the borehole wall without monitoring system, the data of surface subsidence can be used to reflect the additional force on the borehole wall to predict the safety of borehole wall.