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以邯郸强膨胀土为研究对象,通过室内无荷膨胀率与有荷膨胀率试验,研究了膨胀土的膨胀率与压实度、初始含水率、上覆荷载之间的关系。由于在较小压力作用下其膨胀率相对无荷条件下而言急剧下降,难以用一个统一的公式来同时反映大荷载与小荷载(<6.25 kPa)下的膨胀率,通过初始含水率、压实度等因素分别建立了无荷膨胀率与有荷膨胀率(荷载≥6.25 kPa)的计算公式,0～6.25 kPa的膨胀率可根据无荷膨胀率与6.25 kPa荷载下的膨胀率线性插值得到,从而建立了膨胀土K0应力状态膨胀模型。该模型对不同膨胀等级的膨胀土均适用,具有推广价值。
Taking Handan strong expansive soil as the research object, the relationship between expansion rate, compaction degree, initial moisture content and overburden load of expansive soil was studied through indoor no-load expansion rate and load expansion rate test. Due to the sharp decrease of the expansion rate under relatively small pressure compared with that under no-load condition, it is hard to use a unified formula to simultaneously reflect the expansion rate under large load and small load (<6.25 kPa). Through the initial moisture content, Solidity and other factors were established without load expansion rate and load expansion rate (load ≥ 6.25 kPa) formula, 0 ~ 6.25 kPa expansion rate can be no load expansion rate and 6.25 kPa under the load expansion rate linear interpolation , So as to establish the K0 stress state expansion model of expansive soil. The model is applicable to expansive soils with different expansion grades and has the promotion value.