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古堰塞湖相沉积地层是岷江上游地区公路建设中常遇到的第四纪地层,其工程性质较差,给公路建设带来了诸如路基沉陷、边坡失稳等工程地质问题。文中在野外调研基础上,通过多种测试试验手段,研究了该地层的矿物成分、颗粒组成及基本工程地质特性。结果表明,该地层主要由粉粒和黏粒组成,矿物成分以伊利石、绿泥石和石英为主,天然状态下,具有孔隙比中等偏高、渗透系数小、饱和度普遍较大等特征。虽然该地层经过了长时间固结,且具有一定胶结,但总体来讲抗剪强度仍然较低,压缩性也较为明显。
The ancient dammed lacustrine sedimentary strata is a Quaternary strata often encountered in the highway construction in the upper reaches of the Minjiang River. Its engineering properties are poor, which brings about engineering geological problems such as roadbed settlement and slope instability to highway construction. Based on the field investigation and research, this paper studied the mineral composition, particle composition and basic engineering geological characteristics of this stratum by a variety of test and test methods. The results show that the strata are mainly composed of silt and clay, and the minerals are mainly illite, chlorite and quartz. Under natural conditions, the strata are characterized by medium-high porosity, small permeability coefficient and large saturation. Although the formation after a long period of consolidation, and has a certain amount of cement, but in general the shear strength is still low, the compressibility is also more obvious.