研究目的：包西线 K 564 +050 ～ +150 左侧路堑护墙在土石分界面处发生剪切错开、堑顶外自然山坡表面发现3 道环形裂缝的边坡病害，对线路的正常运营形成安全隐患，研究查清病害发生的原因机理，为病害整治方案的研究、措施设置提供依据，为类似工程探索勘察设计思路。
研究结论：地表及地下水径流条件的改变是病害发生的外部条件; 气候环境的影响是病害的诱发因素; 土石界面处土体物理力学指标的变化及软塑带的形成是病害形成和发生的关键; 病害的发生、发展与当地的冻融循环规律基本一致; 在病害原因分析的基础上，对整治措施进行多方案研究，并确定应急措施和永久治理相结合的最佳方案，整治效果理想。通过本文的研究期望能对今后类似工程建设提供参考和借鉴。
Research purposes:The shearing stagger and 3 loop cracks were found in the interface between the soil and stone on the parapet wall of the left cutting at K 564 + 050 + 150 of the Baotou－Xi＇an Railway and on the surface of the natural hillside outside of the cutting top． These diseases brought about the safety hazard to the normal operation of the railway．The investigation was made on the reasons and mechanism for the slope disease to provide the basis for taking control measures and provide the reference to the similar works．
Research conclusions: The changes of the runoff conditions of surface water and underground water were the external factors for the occurrence of the diseases． The influence of climatic environment was the induction factor． The changes of the physical mechanics indexes of the soil on the interface between the soil and stone and the formation of soft plastic belt were crucial to the formation and occurrence of diseases． The occurrence and development of diseases were basically consistent with the local freeze thawing cycle regulation． On the basis of disease analysis，the study was done on the control measures，and the control scheme of the emergency measures along with the permanent treatment were worked out and carried out，obtaining the perfect result．
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