拟对某湿陷性黄土地基采用灰土挤密桩加固，采用等边三角形布桩，桩距1.0m，桩长6.0m，加固前地基土平均于密度ρd＝1.32t/m3，平均含水率ω＝9.0%，为达到较好的挤密效果，让地基土接近最优含水率，拟在三角形形心处挖孔预渗水增湿，场地地基土最优含水率ωop＝15.6%，渗水损耗系数K可取1.1，试求每个浸水孔需加水量。
参考答案：
一根灰土挤密桩所承担的处理面积
相应土质量 ms＝ρd×V＝1.32×5.19＝6.85t
含水质量 mw＝ω×ms＝0.09×6.85＝0.616t
浸水后土含水质量 m＇w＝0.156×6.85＝1.069t
增加的水量为 m＇w-mw＝1.069-0.616＝0.453t
需加水量 h(m＇w-mw)×K＝0.453×1.1＝0.498t
| 阅读理解 | ||||
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