承压水减压引起的沉降分析

由下卧承压水层减压引起的固结沉降计算与一般的由堆载或潜水位下降引起的固结沉降计算不同,本文着重研究了在深厚弱透水层下卧强透水承压层的复杂地质条件下,下卧承压水层减压引起的土中应力变化及周围地表沉降的计算方法;在假定一维竖向固结的条件下推导了减压引起的沉降固结度计算公式,该公式与常规的双向排水固结公式相同,表明排水减压固结与常规的双向排水固结有着相同的效果.最后,将此分析方法应用于潮州供水枢纽工程西溪水闸沉降分析中,实践的结果表明,该方法简单可行,能较好地满足工程要求.

Analysis of settlements caused by decompression of confined water

The calculation of settlement caused by the decompression of the cobble bearing course is different from those caused by normal loading or the water lever depression. The article mainly concerns the settlement analysis caused by the relief of water pressure in the cobble bearing course with a deep aquiclude overlaying. Assuming the seepage occurs in the vertical way, the consolidation degree equation in the complicated situation is deduced. The form of the equation is the same as the normal drain consolidation in two-direction suggesting they are equivalent. Finally, the application to the Xixi sluice settlement analysis of Chaozhou Water Supply Project is accomplished. The outcome indicates that the way is simple and feasible.