考虑有机物降解的变形试验和计算方法研究

Settlement calculation method and experimental study of wastes by considering decomposition of organic matter

垃圾土变形中有机物降解是一个非常重要的因素,又是很复杂的过程。进行了温度与湿度小范围波动、无压力、持水率条件下有机物降解的质量跟踪试验和垃圾土柱沉降试验,且在质量跟踪试验中还进行了淋滤液产生量的同步测定,分析了有机物降解的质量变化、质量变化速率的规律,初步明确了有机物降解的规律性结论。在质量跟踪试验的基础上,初步提出了有机物降解随时间变化规律的数学表达和3个基本计算参数的确定方法,计算结果与试验结果比较接近。用质量跟踪试验的研究结果对垃圾土柱试验进行了计算模拟,分别计算和分析了次压缩和有机物降解沉降随时间变化的过程。计算结果表明,在总的长期沉降中有机物降解引起的沉降比次压缩影响要大,考虑有机物降解和次压缩的计算结果与试验结果吻合较好。

Decomposition of organic matter is an important and complex process in deformation analysis of wastes. Tests of decomposition and settlement of waste column had been performed under the conditions of nearly unchanged temperature and moisture, zero pressure and bearing water content. During decomposition volume of leach was measured. The behavior of decomposition and its rate was analyzed. Decomposition law including three conclusions was identified. Mathematical expression of the decomposition quantity with time and the method to determine the three parameters in the expression were presented. Calculation result of the decomposition is consistent with the test. The waste column test was simulated by using the decomposition test result. The settlement of the waste column was calculated by considering secondary compression and decomposition separately. It is found that the calculated settlement is in good agreement with the waste column test; and the settlement from decomposition is an more important factor than the secondary compression.