为进一步丰富和完善构造混杂岩孕灾机制研究，以北澜沧江结合带为例，通过野外地质调查和室内测试分析，精细解剖构造混杂岩构造岩石学特征，查明物理力学特性，揭示其地质灾害效应。结果表明：北澜沧江结合带构造混杂岩作为非能干层夹持于西南侧花岗岩、花岗片麻岩和北东侧火山-沉积岩之间，主要岩石类型为千枚岩、板岩夹少量玄武岩、灰岩和硅质岩岩块，具明显“混杂堆积”特征，在构造隆升-差异风化-河流侵蚀的耦合作用下，逐渐演化为高山深切峡谷地貌，为地质灾害发育提供了地形地貌条件；在构造岩石学方面，北澜沧江结合带构造混杂岩表现出“一弱三强”的特点，即弱变质、强变形、强蚀变和强定向，导致岩石严重劣化，是地质灾害发育的物源条件；在物理力学特性方面，北澜沧江结合带构造混杂岩表现为一套易滑软岩“地层”，富含黏土矿物，具高孔隙度和吸水率、低抗压和抗剪强度，在斜坡内易形成软弱层或软弱带，进而长期蠕变演化为滑带，为地质灾害发育提供了结构构造条件；北澜沧江结合带区域构造运动和构造应力作用强烈，为地质灾害发育提供了动力学条件。研究结果有利于进一步丰富和完善构造混杂岩的孕灾机制。

In order to enrich and improve the geohazard-pregnant mechanism of structural mélange, taking the North Lancang River suture zone as an example, the structural petrology characteristics of the structural mélange were dissected, then the physical and mechanical characteristics were identified through field geological investigation and laboratory test analysis, and finally its geohazard effect were revealed. The results show that the tectonic mélange in the northern Lancang River suture zone is sandwiched between granite and granite gneiss on the southwest and volcano-sedimentary rocks on the northeast as a non-abutment layer. The main rock types are phyllite and slate with a small amount of basalt, limestone and siliceous rock blocks, showing obvious "hybrid accumulation" characteristics. Under the coupling process of tectonic uplift, differential weathering and river erosion, it gradually evolved into a mountain deep canyon landform, which is the topographic basis for the development of geohazard. In terms of structural petrology, the structural mélange in the North Lancang River suture zone shows the characteristics of "one weak and three strong", that is, weak metamorphism, strong deformation, strong alteration and strong orientation, which leads to serious deterioration of rocks and is the source basis of geohazard. In terms of physical and mechanical properties, the tectonic mélange appears as a set of easy to slip soft rock "formation", rich in clay minerals, with high porosity and water absorption, low compressive and shear strength, which provides structural conditions for the development of geohazards. Tectonic activity and tectonic stress are strong in the North Lancang River suture zone, which provides dynamic conditions for the development of geohazards. The research results are conducive to further enriching and improving the geohazard breeding mechanism of tectonic mélange.