我国既有露天矿山边坡失稳情况绝大多数发生在台阶边坡或组合台阶边坡,本文针对露天矿山组合台阶边坡的特点提出一种以预应力框架锚索和微型抗滑桩群作为主要支挡结构的边坡加固方案.以洛钼集团三道庄露天矿观礼台下部滑坡为例,在简要分析其成因及整体稳定性的基础上详细介绍该方案的主要实施过程及关键施工技术,并对施工过程监测结果进行分析.结果 表明:边坡治理前整体处于基本稳定状态,但随着暴雨、地下水的影响,边坡稳定性将不断降低,最终会发生整体失稳;治理及监测结果表明该方案可行且有效,随着施工过程的结束,边坡变形逐渐稳定并趋于停止,至今边坡状态良好.

在市政路桥工程的施工过程中,软土地基是经常会遇到的问题.如果不对软土地基进行处理,会对软土路基路面的稳定性、耐久性以及平整度产生严重影响.文章对市政路桥工程施工中的软土地基处理技术进行了分析,并提出了相关的软土地基处理措施,希望能够促进我国市政路桥工程质量水平的提高.

After years of mining,a large number of underground goafs appeared in Sandaozhuang mine,which was potential hidden trouble in mining production.Based on the underground mine goafs condition,two goafs in the north area of 1330 bench were studied.The deep hole blasting method with delay time hole-by-hole was used to deal with underground goafs based on the real bench situations,which ensured the production work in the bench and get rid of potential goaf trouble simultaneously.

In this paper,a necessary and sufficient condition for weighted inequality of strong(Φ,Φ)-type of martingale maximal operator was given.By this condition,considered the case of non-weight,an improved Doob maximal inequality of Φ-extension type was obtained.

Combined with the present concrete construction technology,it classifies additives by the change to concrete function caused by additives,and introduces the functions,common categories and attentions of four kinds of additives which can respectively improve rheological performance,adjust condensing time,improve endurance and improve other performances,so as to apply additive in concrete construction reasonably.

The settlement rate and consolidation degree are considered as the very important unloading criterion in soft foundation treatment by using vacuum preloading method in relative codes.Because different preloading methods are used in some projects,the most concerned problem is when to unload owing to the overlap on construction time limit.Based on one-dimensional consolidation theory and one-dimensional theological equation of Voigt-Kelvin viscoelastic model,the results show that the relationship between the settlement rate and the settlement of ground is approximately linear at the primary and secondary consolidation phases.The unloading time for the design consolidation degree could be predicted by using hyperbolic settlement fitting method and Asaoka method.The settlement rate could be computed and the unloading time could also be confirmed through the relationship between the settlement rate and the residual primary settlement based on the three-point method for forecasting the final settlement.The said methods are effective to the soft foundation treatment called the joy coast project in Shenzhen Overseas Chinese Town,which may have the preferable application value.

Combined with an engineering case of artificial lake marine silt foundation treatment by vacuum preloading method,through observing foundation rebound deformation after unloading by vacuum preloading,it shows that the foundation yields one or two centimeters rebound deformation,one or two percent rebound rate,and rebound deformation becomes stable in ten days.Through observing foundation rebound deformation after unloading by vacuum preloading,soil rebound law can be understood after unloading,and the reinforcement effect can be also evaluated.