深埋泥炭质粘土的力学性能  

Mechanical behavior of underlying peat clays deeply

作　　者：张尔其[1] 李淑平[2] 

机构地区：[1]哈尔滨工业大学土木工程学院,哈尔滨150090 [2]黑龙江科技学院土木工程系,哈尔滨150090

出　　处：《哈尔滨工业大学学报》2009年第8期34-37,共4页Journal of Harbin Institute of Technology

摘　　要：为研究深埋的泥炭质粘土的静力和动力性能进行了静力和动力试验,进行了静力和动力试验.通过静力试验,验证了双曲线应力应变关系及邓肯—张模型也适用于泥炭质粘土,测定了邓肯—张模型参数,并发现参数k、c、随的埋深增加而增大.动力试验结果验证了Hardin和Drnevich提出的动力学模型也适用于泥炭质粘土,測定了相应的模型参数,发现参数kG.d随的埋深增加而增大.确定了在原位条件下的Gd/Gd..max-r及λ/λmax-r关系线,并与Seed建议的一般粘性土平均的关系线做了比较.发现的模量比Gd/Gd..max随剪应变幅值r增加衰减地比较慢,线性阶段可延续到剪应变幅值达到10-4.相应地,泥炭质粘土的λ/λmax-r关系线也明显地不同于Seed建议的粘性土平均的λ/λmax-r关系线.Static and dynamic mechanics behaviors of underlying peat clays deeply were studied by experi- ments. It is validated that the hyperbola stress - strain relationship and Duncan - Chang model are suitable to express the static mechanics behavior of peat clays, and paremeters of K, c and , φ merease with the depth in- crease of peat clays. It is also validated that the dynamics model proposed by Hardin and Drnev;ch is suitable for peat clays, and the parameter of KGd increases with the depth increase of peat clays. The Gd/Gd - r curves and λ/λ - r curves of peat clays in situ were determined and they were compared with those proposed by Seed. It is found that the ratio of Gd/Gd of peat clays is degraded more slowly with the increase of shear strain .amplitude than that of general cohesive soils, and the linear segment can extend to the shear strain amplitude of 10^-4. Correspondently, the λ/λ max- r curves of peat clays are obviously diffirent from those of general cohesive soils.

关 键 词：泥碳质粘土埋深的影响 非线性力学性能 力学模型参数 

分 类 号：TU449[建筑科学—岩土工程]