真空和堆载两种预压法的室内试验研究

通过室内试验模拟真空预压法和堆载预压法加固不同深度的土体,对两种预压法下土体前后的物理力学性质指标、土体的沉降量、排水量等进行了分析,认为两种方法均能使土体的物理力学性质改善,就渗透性而言,真空预压优于堆载预压,但就压缩性而言,堆载预压优于真空预压;堆载预压下试样的轴向位移远大于真空预压下的轴向位移,且比真空预压下的沉降收敛慢;真空预压下的排水量大约是堆载预压下排水量的1.8倍;在真空预压和堆载预压下,浅层土体的排水量均大于深层土体的排水量。

Study on laboratory test of vacuum and surcharge preloading

By modeling vacuum preloading and surcharge preloading in different depths of the soil using the laboratory test; then soil properties before and after test, axial settlements, volume changes of two methods are analyzed. And some useful conclusions are drawn; soil properties are improved and penetrability after vacuum preloading is better than the one after surcharge preloading, while compressibility after surcharge preloading is better than the one after vacuum preloading. Settlement after surcharge preloading is much bigger than the one after vacuum preloading, and it is constringed more slowly than the one of vacuum preloading. Volume change after vacuum preloading is 1.8 times more than the one after surcharge preloading, and volume change of shallow soil is more than the one of deep soil after vacuum and surcharge preloading.