【摘要】 渗透变形是影响基坑安全的重要因素之一,在实际工程中必须对基坑的突涌以及流土等渗透稳定性进行安全验算,然而现行规范中的流土稳定性验算公式,尚无法直接用于非均质含水层条件下的基坑工程。针对这一不足,在对已有流土稳定性验算公式和悬挂帷幕条件下基坑土层的渗流特点进行深入分析的基础上,提出一种更为适用的基坑流土稳定性验算方法。该方法原理简单明确,易于掌握,能较好地解决实际工程中常遇到的非均质含水层条件下流土稳定性安全验算问题。最后,通过将该方法计算结果与有限元方法进行比较,进一步证明了所建议简化算法的合理性和适用性。更多还原

【Abstract】 Seepage deformation is an important factor affecting the safety of foundation excavations. Security checking for seepage stability must be implemented before excavating,in order to prevent seepage failure such as:bursting and soil flow. However,the soil flow stability checking formulas in current specification could not be used in condition of heterogeneous aquifers. On the basis of analyzing the current checking formulas and seepage characteristics of the aquifers around suspended curtain,a new simplified method for checking soil flow stability is proposed. The new method is simple and clear,easy to master,especially can better solve the problem of checking soil flow stability in condition of heterogeneous aquifers,which is often encountered in many foundation excavation engineering. Finally,the rationality and applicability of this simplified method is further proofed by comparing with FEM results on the same example.更多还原