灰土挤密桩在湿陷性黄土地基中的设计方法

结合工程实例，介绍了灰土挤密桩法在湿陷性黄土地基中的设计方法、计算过程及在施工过程中采取的技术措施。在湿陷性黄土地基中采用灰土挤密桩法进行地基处理，能够有效地消除其湿陷性，提高复合地基的承载力。     

强夯加固湿陷性黄土路基的瞬态动力数值模拟

用有限单元法数计算了黄土路基单点多次夯击过程,在算例中给出了邯长高速公路夯击过程中地基内各点的应力、位移变化规律,并将计算结果与强夯法施工现场的测试结果作了比较.结果表明:模拟计算较好地反映了路基土体在强夯加固过程中的物理、力学参量的变化规律.     

模糊信息优化方法在黄土湿陷性评价中的应用

目的 用模糊信息优化方法中的信息扩散原理建立黄土湿陷评价方法。方法 收集黄土高原地区68组黄土湿陷性的土工试验资料，选取含水量、孔隙比和压缩系数等重要影响因素，采用模糊信息优化处理中的信息扩散原理及一、二级模糊近似推论，建立了各评价指标与湿陷系数之间的模糊关系。结果 形成一套用信息扩散原理建立的黄土湿陷性评价方法，对10组黄土湿陷资料进行了非母体验证，效果良好。结论 该方法简单、快速、实用，能使更多影响黄土湿陷的因素真实地参与评价，可应用在黄土高原区域性的城镇防灾规划、城镇工程地质图集的编制和黄土区域湿陷性分析等方面。     

非平稳弱相依高斯序列次最大值的位置和高度的联合分布

在条件1/n∑i=[cn]^[dn]exp（an^＊（mi-mn^＊）-1/2（mi-mn^＊）^2）→d-c n→∞,0＜c＜d≤1 下，得到了非平稳弱相依高斯序列次最大值的位置和高度的联合渐近分布．     

一些数列的组合恒等式

主要应用初等方法研究了一些数列的性质，同时给出了一些组合恒等式．     

Aragonite-calcite transformation in fossil snail shells of loess sequences in Loess Plateau, Central China

The methods of X-ray diffraction (XRD) and ICP-AES are applied to analyzing the mineral composition of modern and fossil snail shells in Luochuan section and Xifeng section. The results show that the mineral phase of calcium carbonate in modern snail shells is aragonite, but for some fossil snail shells in certain layers of loess sequences, a part of aragonite is transformed into calcite. In Luochuan and Xifeng sections, the stratigraphic borderline of aragonite-calcite transformation appearing obviously is between L5 and L6. Under the earth surface condition, the aragonite-calcite transformation is influenced by the factor of temperature only in a long time scale. It seems that the pressure is not the factor influencing the aragonite-calcite transformation. The results also show that existing age of snail shells is possibly the dominant and principal factor for the aragonlte-calcite transformation. To a certain extent, thed egree of aragonite-calcite transformation in snail shell is controlled by the content of trace element, such as Mg^2 . The trace element can improve the stability of snail shell aragonlte and impede the process of aragonite transforming into calcite.     

Statistical Characteristics of the Complexity for Prime-Periodic Sequences

Using the fact that the factorization of x^N-1 over GF(2) is especially explicit, we completely establish the distributions and the expected values of the linear complexity and the k-error linear complexity of the N-periodic sequences respectively, where N is an odd prime and 2 is a primitive root modulo N. The results show that there are a large percentage of sequences with both the linear complexity and the k-error linear complexity not less than N, quite close to their maximum possible values.     

Two different illites in Luochuan loess,Northern Shaanxi Province

Illite is the dominant clay mineral in loess and pa-leosol of China accounting for over 50% in content. Ac-cording to the latest mica group nomenclature issued bythe International Mineral Association (IMA), illite is de-fined as a dioctohedron-textured mi…     

鞅差序列的一个弱大数定律

通过使用一致收敛性对随机变量序列进行截尾,并借助随机变量序列的弱收敛定理,在φ(xx)↑,φ(x)x2↓的条件下给出了一个鞅差序列的弱大数定律.     

黄土高原不同地貌特征对产沙的影响

通过对黄土高原典型小流域地貌参数的分析计算,应用地貌单位线理论,分析了地貌参数与产沙的关系,揭示了地貌特征对产沙的影响,并把地貌因子引用到暴雨洪水产沙计算模型中,有效地解决了无水文资料地区的产沙分析评价和预测等问题,为开展区域水土保持研究和治理提供了新途径.