水压致裂煤层裂缝发育特点的研究   总被引：5，自引：0，他引：5       下载免费PDF全文

李同林 《地球科学》1994,19(4):537-545

本文对煤岩基本力学性质、煤层水压致裂缝形成条件、裂缝形态以及裂缝开裂角方位等基本理论进行了研究与探讨，通过大量煤岩力学性质测试，证实了试验区目的层煤岩弹性模量低，泊松比较高，脆性大，易破碎，易压缩。文章还得出了目的层煤岩Ｍｏｈｒ断裂准则二次抛物线型包络线，煤层水压致裂裂缝形式判断，裂缝开裂角方位的计算公式以及有关结论。  相似文献   

一种BASIC通用菜单驱动程序的设计     

许俊奇 《山西地震》1994,(2):47-51

在对ＣＣＤＯＳ汉字操作系统和ＢＡＳＩＣ语言特点的认真分析和处理后，得到了一个良好的通用菜单驱动程序，它完全可在不加改动或很少改动的情况下应用以汉字ＣＣＤＯＳ为操作系统的各种菜单驱动程序中。  相似文献   

新一代计算机控制的岩石材料试验机          下载免费PDF全文

马孝春 《探矿工程》1994,(6):19-20

本文结合厦门海沧经济开发区路网规划工作，着重探讨了区域公路网规划的分区、原则、交通量预测、路网布局、实施方案等问题。  相似文献   

华北型煤田矿井突水灾害的防治   总被引：5，自引：2，他引：5       下载免费PDF全文

王明玉  张宝柱 《地质论评》1995,41(6):553-558

我国华北型煤田矿井中具有多层含水层，常发生底板突水事件，为了对突水灾害的防治，本文提出了切实可行的步骤，并利用水力学概念模型，研究了该类型矿井的突水量规律及其防治方法。  相似文献   

从水流挟沙力和河槽形态规律分析黄河调水调沙   总被引：3，自引：0，他引：3  

张遂业  涂启华 《水文》2005,25(6):33-36

在分析水流挟沙力和河槽水力形态规律的基础上，研究调节流量、含沙量和泥沙组成的优化组合，解决河道输沙减淤和河槽相对稳定问题，提出调水调沙方向。达到合理利用水资源和河道减淤与治理相结合的目的．  相似文献   

国家大剧院深基坑地下水控制设计及施工技术   总被引：3，自引：0，他引：3  

张志林  何运晏 《水文地质工程地质》2005,32(3):113-116

国家大剧院基坑地下水控制是大剧院工程的三大难题之一,也是专家们讨论的焦点。经过水文地质试验和充分论证,确定了地下水控制方案和施工方法,即采用反循环成井工艺施工引渗井,将上层滞水和潜水引渗到第一层承压含水层中消纳,保证第一步基坑开挖至-15 7m;在-15 7m位置采用连续墙阻隔第一层承压水,并使用旋挖钻机在槽内施工降水井,疏干槽内承压含水层并进行越流补给控制,保证基坑开挖至-26m;在歌剧院台仓局部加深部份(-32 5m),采用封闭布设减压井,解决基坑开挖和台仓地下结构施工时基坑突涌的问题;最后采用特殊的封井技术,将井管内高于槽底约10m的承压水头封堵在槽底以下0 5m,安全截断井管,保证了基础施工。  相似文献   

论"单位涌水量就是导水系数"   总被引：2，自引：0，他引：2  

兰太权 《地下水》2007,29(5):43-45,68

单位涌水量是井抽水水位降深换算为1 m时的单井出水量;导水系数是含水层宽度为1 m时,地下水水力坡度为1时的单宽流量.二者之间从定义上看毫无关系,但它们的单位(m3/d·m)(m2/d)是相同的.笔者经过多年探讨和初步试验后发现,单位涌水量就是管井抽水所利用含水层的导水系数.  相似文献   

岩体裂隙等效水力隙宽的统计确定方法   总被引：1，自引：1，他引：1  

钟嘉高  梁杏  任志刚 《地质科技情报》2007,26(4):103-106

针对天然裂隙岩体等效水力隙宽确定的复杂性,利用平行板水流的立方定律及流量等效原理,推导出光滑平行板单裂隙的等效水力隙宽公式,同时对隙宽分布的频率特性进行了探讨,认为非均匀隙宽单裂隙的等效水力隙宽可近似取40%频率的隙宽,或取隙宽的几何平均值与调和平均值的算术平均值.  相似文献   

Numerical simulation of groundwater flowing to horizontal seepage wells under a river   总被引：6，自引：0，他引：6  

Wei Wang  Ge Zhang 《Hydrogeology Journal》2007,15(6):1211-1220

A horizontal seepage well, consisting of an interconnected vertical well, galleries, chambers and small-diameter radiating bores, is used to acquire relatively clean water that has been filtered through natural alluvial deposits in a riverbed. It has wide application, especially in arid and semi-arid areas. The lack of calculation formulae or models for horizontal seepage wells, up until now, has resulted in several false applications. Based on the analysis of groundwater flow characteristics, it has been concluded that several flow regimes coexist and hydraulic head loss exists in the horizontal seepage well. To avoid the difficulty of confirming the flux or head distribution in such a complex system, the model boundary of the whole horizontal seepage well has been moved to that of just the vertical well, and the well-aquifer system was treated as a heterogeneous medium, where the horizontal seepage well itself is a highly permeability medium. A mathematical model has been developed, based on the coupled seepage-pipe flow, by the introduction of equivalent hydraulic conductivity according to different flow regimes. Then a three-dimensional finite difference numerical model, based on the mathematical model, was developed and applied to a horizontal seepage well in China. The numerical model verified the groundwater flow characteristics of the horizontal seepage well. An erratum to this article can be found at  相似文献   

EFFECTS OF RIVER NETWORK WORKS AND SOIL CONSERVATION MEASURES ON RESERVOIR SILTATION     

Bruno MOLINO Rosa VIPARELLI Annamaria DE VINCENZO 《国际泥沙研究》2007,22(4):273-281

Knowledge of the morphological dynamics of a water course is essential for management of reservoir siltation. With an example of sedimentation in a reservoir in Basilicata, Italy, this paper demonstrates the effect on reservoir siltation of the hydraulic works, which are aimed to reduce sediment transport along the fluvial network and to prevent part of the sediment discharge from reaching the lake. The effect depends on the river type and on the the geological features of river basin slopes. The paper also shows how mass erosion can significantly contribute to development of reservoir siltation. Finally, preliminary results are provided about the time needed for river training works to be effective.  相似文献