考虑温度效应的饱和土地基固结理论
Consolidation theory for saturated ground considering temperature effects
-
摘要: 考虑温度(加热)的固结理论是当今岩土工程领域颇为关注的研究课题之一,其在能源地下工程、核废料处置和热法地基处理等方面具有应用背景。针对现有热固结理论研究的不足,考虑加热对土体固结压缩特性和孔隙水压力的影响,给出了荷载和加热联合作用下饱和土地基固结沉降、超静孔压和固结度的实用计算方法。基于详细的参数计算分析,探讨了热固结理论的合理性。最后开展耦合加热的软土地基和竖井地基模型试验,将理论解答与实测结果进行对比分析,检验理论的准确性与可靠性。研究结果表明,所建立的热固结理论可以分析地基在加热后的回弹与沉降,解释加热引起的超静孔压上升和快速消散,扩展了常温下的经典固结理论,可供涉热岩土工程相关问题分析时参考。Abstract: The consolidation theory considering temperature effect (heating) is one of the research topics that are of great concern in geotechnical engineering today. It has its application background in thermal energy geo-structure, nuclear waste disposal and thermal ground treatment technology and so on. Aiming at overcoming the shortcomings of the existing thermal consolidation researches, the formulas for calculating the consolidation settlement, excess pore water pressure and degree of consolidation are presented on the basis of coupling the temperature effects on soil consolidation behavior and pore water pressure. The rationality of different expressions is discussed according to an example. The model tests on soft ground and vertical drained ground coupling with heating are carried out. The accuracy of the proposed method is checked through the comparison between the theoretical and measured results. The method can be used to analyze the rebound and settlement of saturated ground and the raise and dissipation of the excess pore water pressure under loading and heating. Thus the traditional classical consolidation theory is expanded and it may provide a theoretical basis for the analysis of the geotechnical problems involving heating.