We selected dongzhaitang profile in the zhaitang basin of xishan mountain , beijing area from which the malan loess got its name and study the sequence of vegetation change recorded in the malan loess of xishan mountain by means of spore - pollen analysis 本研究选取马兰黄土的命名地?北京西山斋堂盆地东斋堂砖厂剖面，以孢粉分析为手段来研究末次冰期中期北京西山黄土中的植被演化过程。
Based on the investigation , in - situ and lab tests on malan loess carried out in utrecht university of netherlands and lanzhou of gansu province with different methods , the water sensitivity , the hydraulic and shear strength properties of malan loess were studied 通过多断面勘测，采用不同的原位及室内试验方法，分别在荷兰尤怀特大学和甘肃兰州对兰州地区马兰黄土的工程地质性质进行了系统测试。
To analyze the loess characters of compression , collapsibility and expansion after unloading , water content and the compaction degree of the loess is changed in the test which indicates that the loess with high compaction degree and low water content still has collapsibility 分析了不同含水量、击实度下黄土的压缩性、湿陷性和卸荷膨胀性，试验表明在高击实度、小含水量下重塑黄土仍然有湿陷性。
This paper tries to make use of unsaturated soil mechanics to study the shear strength characters of undisturbed loess . stress - strain relationship , the relationship between volumetric strain and water content , the relationship between shear strength and water content are analyzed in this paper 尝试从非饱和土力学角度研究原状黄土的强度特性，分析了原状黄土的应力应变特性、体变特性以及强度与含水量之间的关系。
In this paper , some aspects such as the behavior of pore pressure of unsaturated loess , the dynamic constitutive relationship and the characteristics of the dynamic modulus , dynamic strength and dynamic damping ratio are studied with the dynamic torsional shear test of loess 在以上研究的基础上，本文又通过黄土的动扭剪试验研究了非饱和黄土的孔隙压力特性、动本构关系、动剪切模量特性、动强度特性以及动阻尼比特性。
