单轴条件下毕节红黏土的力学特性及灵敏度

Mechanical Behaviors and Structural Research of Bijie Laterite under Single Axial Condition

为研究毕节红黏土的力学特性及结构性,进行了基本物理指标的测试,通过制备原状样、重塑样,测定了不同含水量红黏土的无侧限抗压强度,分析了差异及原因;根据试验数据定义了等应变灵敏度,对比分析了两种灵敏度的差异,总结了等应变灵敏度与含水量之间的对应关系。研究结果表明:原状红黏土的无侧限抗压强度比重塑土高得多,原状样的应力应变曲线具有明显的转折点,重塑样的应力应变曲线大都呈硬化型,二者的破坏形态具有较大差异;等应变灵敏度在反映含水量变化对红黏土结构性影响方面具有合理性。

To study the mechanical behaviors and structure of Bijie laterite,a series of indoor basic physical tests were carried out.The unconfined compressive strength of intact,remolded laterite with different water content was tested,and the differences and causes were analyzed.Based on the test date,a new sensitivity index is defined,and the difference between the sensitivity traditional defined and the equal-strain sensitivity is analyzed.The results are that,the unconfined compressive strength of intact laterite is much taller than the remoulded,the stress strain curve of the former has obvious turning point,while the stress strain curve of the latter is mostly hardening type,and the failure mode has a great difference between the two type laterite;and it is concluded that the equal-strain sensitivity is reasonable to reflect the structural effect of water content change on Bijie laterite.