深厚松散地层泄压槽治理井筒破坏判据及其与地下水水位关系

doi:10.13278/j.cnki.jjuese.20200283

Abstract

Abstract: In order to solve the problem of failure criterion of concrete shafts in thick loose strata, the numerical limit strain method is used to analyze the change of shaft strain value,that is, when the strain of element circumferential connection reaches the limit strain value in the shaft, the calculation of non-convergence is taken as the criterion for the overall failure criterion of the shaft. In this study, two numerical calculation models of wellbore with and without pressure relief grooves were established respectively, as the stress-relief groove has a vertical pressure relief function. The calculations show that the soil around the shaft was destroyed before the shaft at 181-183 m. The shaft without stress-relief groove failed at 181-182 m when the groundwater level dropped by 27 m; While the shaft with stress-relief groove failed at 182-183 m when the groundwater level dropped by 38 m. At present, the groundwater level has dropped by 20 m, so the shaft is safe. The numerical ultimate calculation result is consistent with the actual monitoring value.

Key words: thick loose strata, concrete shaft, numerical ultimate strain method, stress-relief groove, groundwater level

CLC Number:

TD265

Pan Weiqiang, Zhang Liming, Cong Yu. Relationship Between Shaft Failure with Stress-Relief Groove and Groundwater Level in Thick Loose Strata[J].Journal of Jilin University(Earth Science Edition), 2021, 51(5): 1578-1586.

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Relationship Between Shaft Failure with Stress-Relief Groove and Groundwater Level in Thick Loose Strata

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