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京藏高速路线范围K1323+600~K1332+340段有湿陷性黄土,为第四系晚更新世原生马兰黄土,以风积成因为主,地层层理不明显,垂直节理较为发育,湿陷性等级从非自重Ⅰ级~自重Ⅳ级,厚度0.5~30m。湿陷性黄土是一种特殊性质的土,在上覆土层自重应力作用下,或者在自重应力和附加应力共同作用下,因浸水后土的结构破而发生显著附加变形。因此,应根据建筑物重要性及浸水可能性,对地基进行综合处理。
The collapsible loess in the K1323 + 600 ~ K1332 + 340 section of the Beijing-Tibet high-speed line is the Late Pleistocene native Malan loess of the Quaternary. Due to the aeolian genesis, the stratum bedding is not obvious, and the vertical joints are well developed and collapsed Sexual level from non-weight Ⅰ level to self Ⅳ, thickness 0.5 ~ 30m. Collapsible loess is a kind of soil with special properties. Under the action of self-weight stress of overlying soil or under the joint action of self-weight stress and additional stress, significant additional deformation occurs due to the structural break of soil after soaking. Therefore, the foundation should be comprehensively treated according to the importance of the building and the possibility of flooding.