三峡库区马家沟滑坡模型形态概化

以三峡库区秭归县马家沟滑坡I号滑体为例, 为研究其在库水位升降和降雨条件下的变形破坏及稳定性, 对其采用框架式模型试验, 参照1∶40相似比进行了缩放.以模型概化前后滑坡稳定性系数相一致为目的, 在2.0m×1.0m×1.5m的试验框架内, 通过改变抗滑桩前的滑体、滑带的几何形态, 建立了与研究对象应力边界条件一致的地质力学模型.概化后对滑坡桩前边界推力和研究区后边界推力进行拟合, 得出相应于实际滑坡在不同水位时边界推力的折减系数.通过调节水位的升降速率来保证在水位变化时滑坡概化前后稳定性系数等效, 数值模拟结果显示滑坡模型的水位变化速率为0.7m/d、水位在183~204m范围内升降满足模拟实际滑坡水位在145~175m间变动的情况, 从而也验证了滑坡概化后模型的合理性.      

Simultaneous Analysis of Qualitative and Quantitative Social Science Data in Conservation

Conservation research includes social as well as natural sciences, and social sciences include qualitative, qualitative, and mixed methods. Most mixed-methods research adopts quantitative and qualitative approaches in parallel or in sequence, using related but distinct sets of data. Transformations of raw data, to apply qualitative and quantitative approaches to the same dataset, are uncommon, and beset by obstacles. I argue that dual analysis of a single dataset can be valuable and sound, subject to four caveats. Authors must: check for adequate sampling as well as theoretical saturation; distinguish clearly between structural and statistical associations; explicitly describe conversion from qualitative constructs and codes, to quantitative categories or other variables; and ensure that precision, reliability and generalizability are considered appropriately within both analyses.