Improvement of calcareous expansive soils in semi-arid environments

The semi-arid climate and geology of Cyprus have caused the formation of calcareous expansive soils on the island. In some areas, swelling has caused serious foundation problems. The industrial by-product Soma fly ash has been used to improve the engineering properties of the soil. Fly ash treatment has shown tremendous potential as an economical method for the stabilization of the soil. Significant reduction in the swell potential and an increase in the hydraulic conductivity values are obtained. Use of fly ash with a small percentage of lime produces even more dramatic results. Cation exchange capacity (CEC) values substantiate the formation of the new pozzolanic reaction minerals which result in more stable silt-sand like structures.     

煤矿采空区钻孔注浆治理工艺

钻孔注浆充填固结处理煤矿采空区塌陷是一种经济快捷的有效方法，本文就其施工工艺方法进行了简单分析，期望能为其它类似工程提供参考。     

江苏溧阳地震孕育和发生的地质因素剖析

研究和剖析了两次溧阳地震孕育和发生的主要地质因素，新生代茅东裂陷盆地；茅东与南京－溧阳两玄武岩喷发带的交汇；茅东断裂带最活动的上沛带；震源区地壳层圈构造（深、浅变质岩界面和低速层）与茅东部断裂带中、深脆－韧性剪切段的复合。探讨了控制溧阳震震级的因素；茅东断裂带属Ⅱ级断裂，茅东裂陷盆地属中、小型裂陷盆地，因此，决定溧阳地震震级为5．0－6．0的中强地震。     

利用煤层裂隙地震各向异性寻找煤层气气藏

煤层气是以吸附状态储集在煤层的微裂隙、裂缝中，煤层既是煤气的源岩层，也是煤层气的储集层。由于煤层裂隙的存在，将导致煤层的各向异性；根据横波分裂理论：横波通过方位各向异性介质时，横波将发生分裂现象，分裂为两个偏振方向近乎正交的横波，即传播方向平行于裂隙方向的快横波和传播方向垂直于裂隙方向的慢横波。本文介绍了煤层裂隙引起的横波分裂现象的实验室研究及实际野外试验成果。实际结果表明，利用转换横波探测煤层裂隙是可行的。本文最后给出了试验煤层裂隙发育范围和裂隙发育方向。     

非饱和土壤水力参数预测的分形模型

综述了利用分形几何理论,可在土壤水力性质,包括土壤水分特征曲线及水力传导系数与土壤结构分维之间建立起一定的函数关系式.这些函数关系式大多与Campbell定律具有相同或相似的幂定律形式,一方面揭示了Campbell定律的物理实质,另一方面可用于土壤持水量及水力传导系数的预测.     

裂缝性边水油气藏水侵量计算方法

水侵量求取一直是困扰油藏工程师的一个问题，其中,裂缝性边水水侵量的计算还没有一个公开的有效方法。本文试根据不稳定渗流模型，提出裂缝性边水水侵量的新计算方法。     

Study on the sources of some deep focus earthquakes in Northwest Pacific region

The sources for thirteen deep focus earthquakes ofm _b≥5.5 andh>400 km in Northwest Pacific region were studied using waveform fitting and shear fracture source model. The source parameters were obtained as follows: focal depth, faulting plane, slip direction, rupture velocity, rupture length, rupture direction and scalar moment tensor. It was found that all these earthquake sources can be interpreted as shear faulting and have simple source time functions. The strike direction of faulting plane for most deep focus earthquakes coincides with that of the subduction zone, especially in the deep part of the subduction zone, it results in the tendency of reducing the dip angle of the subduction zone. The multiple point source model was also used to study the source process. The waveform fitting is better than the shear fracture model, but the general rupture direction which coincides with that from unilateral shear source model can not be obtained from the multiple point source model. This study is supported by the National Science Foundation of China and the Chinese Joint Seismological Science Foundation.     

从天津地区近十年的地下水位变化初探本区断裂活动的新动向

在现有地震流体研究成果基础上，借地下水位的时空异常图象进行推测区域构造断裂活动的探索。通过对天津夺区１９８５至１９９４年地下水位异常的分析对本区的构造洗给出了以下推测；（１）１９８９年大同６．１级地震对地区构造活动显示出突出的调整性的变化。（２）沧东断裂带是本地区最活跃居主导活动地位的断裂。（３）沧东断裂带应力集中部位有同天津西南段向东北转移的迹象。     

岩石蠕变破坏实验研究及其对地震预报的意义

通过对不同温度和围压条件下济南辉长岩的蠕变破坏实验结果和声发射特征分析,本文提出以岩石蠕变破坏应变做为岩石蠕变破坏判据。建立了岩石蠕变破坏应变的经验关系式。依据实验结果得到相应的济南辉长岩蠕变破坏应变参数,进一步探讨了预报岩石蠕变破坏和地震的方法