decayed gravel bed

Research on PDC bit for drilling in gravel interlayer.;

适用于砾石夹层钻进的PDC钻头

The target strata designed to drill is deep and multiple complicated sets of layer are drilled,for example,gravel layer with its upper part easy to collapse,layer with abnormal high pressure in Anjihai Areas,wellbore diameter being shrunk in Shawan in Taxihe Areas,which brings many difficulties to drilling con- struction,Considering the features of strata above and eight difficu.

上部极易坍塌的砾石层、安集海异常高压层、塔西河沙湾的缩径;给钻井施工增加了难度。

The thermal characteristics of heat storage and release of the gravel layer used in the solar collector in winter were analyzed.

7m)为依据进行了模拟;利用太阳能集热器的热能与直径为50～100mm的砾石铺设成150mm厚度的地下蓄热系统进行蓄热和放热试验,研究昼夜之间室内砾石的蓄热和放热特性;通过测试太阳能集热器的内部温度、砾石层内部及室内地表面的温度,研究了太阳能集热器的蓄热效率和转换效率,同时分析了蓄热层及室内地表面的热传递特性;为进一步开拓针对冬季寒冷地区太阳能蓄热型居民建筑物内部热环境方面的基础研究提供了科学的依据。

However, it is difficult to use in the complicate mountain areas and the gravel layer.

地震勘探在煤田、油气田的研究中广泛应用,然而在砾石层比较发育的地区或复杂山区却遇到了困难;作者分析了砾石区地震施工存在的问题,提出了针对不同的砾石类型区采用不同震源的解决办法,打破了以往在砾石区施工只采用可控震源的常规方法;在有些砾石区通过炮井组合取得了较好的效果。

Field test study of methods for supporting large-section inclined shaft in gravel layer

卵砾石层大断面斜井井筒支护方法现场试验研究

From consolidating similar past case studies with regards to the problems encountered during construction phase, this article is able to provide an important point of view on shield tunnel design in gravel layer.

依搜集既有卵砾石层潜盾隧道案例显示,其施工可能遭遇如大卵石障碍物、卵石引致切刃磨耗、钻掘引致沉陷、潜盾机具选择等问题,这些问题之因应设计考虑与土层隧道者不同,亦为卵砾石层潜盾隧道重要课题之一。

ESR Stratigraphically Chronological Study of the Gravel Layer in Yangluo Town,Wuhan City

武汉阳逻砾石层ESR地层年代学研究

Construction Technology of Curtain Grouting of Deep Gravel Layer

深厚砂砾石层防渗帷幕灌浆施工技术

Experimental Investigation on the Grouting and Analysis on Seepage Calculation in Sand Stratum and Gravel Bed;

砂砾石层灌浆试验研究及渗流计算分析

The Study on the Geologic Specific Property and the Engineering Measures of the Gravel Layers in Area of YaAn;

雅安砾石层工程地质特性及工程措施研究

Model Test on Failure Mechanism of the Surrounding Rock of Oblique Laneway inSeepage Thick Gravel Stratum

渗水厚砾石层斜井巷道围岩破坏机理模型试验

Successful application of horizontal directional drilling to pipe-laying construction through sand gravel strata

水平定向钻进技术在砂卵砾石层中的成功应用

Model test on failure mechanism of the surrounding rock of oblique laneway in thick gravel stratum under seepage water

渗水厚砾石层斜井围岩破坏机理模型试验

The origin of the Pleistocene gravel in western Sichuan depression

川西凹陷地区更新统砾石层沉积成因探讨

Heavy mineral characteristics of gravel layers in the Zhoulao Town borehole

周老镇钻孔砾石层重矿物特征及地质意义

formation-to-gravel size ratio

地层砂与砾石粒度比

gravel to sand size ratio

砾石-地层砂粒度比

gravel-to-sand median diameter ratio

砾石-地层砂直径中值比

multiple zone open hole gravel pack

多层裸眼井砾石充填

median pack-to-formaton grainsize ratio

充填砾石与地层砂粒度中值比

packerless single selective gravelpacked completion

无封隔器的单层选择性砾石充填完井

solid gravel seal

密实的砾石充填层间密封

Reinforcing this layer by grunting mode is introduced.

介绍采用注浆方式来加固砂卵（砾）石层。

A layer of coarse gravel is often placed around the drain tile.

常常在排水瓦管周围铺一层粗石砾。