地裂缝活动对Q_3残积古土壤物理力学性质的影响

Influence of Ground Fissure Activity on Physical and Mechanical Properties of Q_3 Residual Paleosol

对长安地裂缝金滹陀探槽工点Q3残积古土壤层原状样进行常规土工试验的结果显示:含水率、孔隙比相对裂缝带在其两侧均变小;密度、干密度在其两侧均变大;压缩模量在其两侧无明显变化;液限、塑限在其南侧无明显变化,而在其北侧变大;压缩模量相对裂缝带在次级地裂缝南侧变大,而在次级地裂缝北侧无明显变化;液限、塑限相对裂缝带在次级地裂缝两侧均变小。此试验结果为研究裂缝带的影响宽度提供了依据。

The results of the conventional geotechnical test on the undisturbed sampling of Qz residual paleosol layer at the Jin Hutuo＇s trial trench of Chang＇an ground fissure show that moisture content and porosity ratio are smaller on both sides of ground fissure compared with that of fracture zone, density and dry density are higher on both sides of ground fissure compared with that of the fracture zone, variation of compression modulus is not obvious on the hoth sides of main ground fissure. Variation of liquid limit and plastic limit are not evident on the south side of the main ground fissure while they are great on the north side of the main ground fissure. Compression modulus on the south side of secondary ground fissure is great compared with that of fracture zone and it is not obvious on the north side of secondary ground fissure. Liquid limit and plastic limit are smaller on both sides of secondary ground fissure compared with fracture zone. The test results can be used as basis for research on affecting width of the fracture zone.