Study on Seepage Control in Complicated Hydrogeological Conditions on the Right Bank of JinPing-I Hydropower Station

With consideration of the special hydrogeological conditions and layout characteristics of the hydraulic structures, the seepage control measures of dam abutment and underground powerhouse on the right bank of JinPing-I hydropower station is drawn up. Based on the three dimensional finite element analysis of seepage control with dry area virtual flow constant mesh analysis method, the rationality of the seepage control measures of dam abutment and underground powerhouse has been verified and the key factors affecting the effect of seepage have been compared. In combination with the curtain of dam abutment, the curtain of underground powerhouse is reasonable. The results showed that the steel liner of penstock after the curtain is necessary.

浅谈悬挂式地下连续墙＋减压井地基处理工程的技术和实际应用

建首先介绍了泵站渗流数值分析和悬挂式地下连续墙＋减压井技术作用的机理，由于本工程场地下卧深厚较弱透水层，施工开挖中低水位条件下基坑已发生多处管涌，高压旋喷桩基础试桩施工中亦发生钻孔喷水，管桩涌水等不利情况，工期严重受到延误。鉴于工程地质复杂，根据地基处理工程各项工艺试验中出现的问题，为确保工程质量和基坑的顺利开挖，并充分考虑工期的紧迫性及防洪渡汛的安全。采用悬挂式地下连续墙＋减压井地基处理技术对泵室基坑进行围蔽截渗固封。本文讨论了地下连续墙＋减压井技术作用的机理及渗流数值分析参数的确定及在工程运用中的防渗效果。