长春白垩系全风化、强风化泥岩崩解膨胀特性及力学性研究

Study on Rock Disintegration and Expansion Characteristics and Mechanical Properties of the Cretaceous Mudstone in Changchun

长春地铁2号线西延分布有大范围的泥岩,其膨胀性和崩解性对基坑边坡的稳定性产生影响。通过现场勘察和室内实验,查明了地铁沿线泥岩的分布情况及其工程地质特征,重点从泥岩的崩解膨胀试验、矿物组成、岩石结构、抗剪强度等方面分析了泥岩的崩解膨胀性和力学性质,发现两者主要在水的因素作用下,导致岩体强度和结构稳定性变化。因此,结合地铁施工的特点和地区工程经验提出了有效的防治措施,为以后类似工程提出了参考。

There is a large area of mudstone in the west of Changchun metro line 2,its’expansibility and disintegration have an effect on the stability of the foundation pit slopes.The distribution and engineering geological characteristics of mudstone along the subway line are found out through field investigation and laboratory experiments,the disintegration and swelling properties and mechanical properties of mudstone are analyzed from the disintegration and expansion test,minerai composition,rock structure,shear strength,etc.It is found that both of them are mainly under the action of water,which results in the change of rock mass strength and structural stability.Therefore,the characteristics of the metro construction and the local engineering experience of the effective prevention measures are put forward,which provide references for similar projects in the future.