| 黄猛,胡海博,吕潇文,贾晓青,牛毅,张姣姣,张学斌,薛敬凤,白晋斌.天津地区新生代地层工程特性与固结特征研究[J].矿产勘查,2025,16(3):659-668 |
| 天津地区新生代地层工程特性与固结特征研究 |
| Study on engineering characteristics and consolidation characteristics of Cenozoic strata in Tianjin Area |
| 投稿时间：2024-06-17 |
| DOI：10.20008/j.kckc.202503024 |
| 中文关键词: 天津地区 新生代地层 物理力学性质 固结特征 临界水位 |
| 英文关键词: Tianjin Area Cenozoic strata physical and mechanical properties consolidation characteristics critical water level |
| 基金项目:本文受陈塘庄分层标监测站重建工程(国土房任〔2015〕5号)资助。 |
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| 中文摘要: |
| 以往对地面沉降机理研究主要集中于地下水开采和工程活动对地面沉降的影响，深部孔隙型地热水开采诱发地面沉降的程度及规律研究尚不清晰，深部地层土体的工程特性和固结特征的研究对深层地下水资源和地热资源的合理开发利用具有重要意义。本文利用天津市中心城区施工的一眼揭穿新生代地层的全取心钻孔，系统研究了新生代土层的沉积环境和工程特性，初步探讨了地面沉降临界水位。研究结果表明，沉积环境对地层的物理力学性质和固结特征有一定程度的影响，湖相及海相地层含水率、孔隙比及液性指数相对偏高，密度较低，洪泛盆地沉积则与之相反。高压缩性及欠固结地层多出现在湖相及海相沉积物中，而超固结地层主要出现在洪泛盆地沉积物中。0～160 m段地层为正常固结状态，不存在临界水位。160～630 m段地层，为超固结状态，为防止地面沉降水位应在控制临界水位深度内。630～1300 m段地层为欠固结—正常固结状态，不存在临界水位，孔隙型地热资源开发利用应严格采取回灌措施，保证水位稳定，避免产生地面沉降。 |
| 英文摘要: |
| Previous studies on the mechanism of ground subsidence mainly focused on the influence of ground-water extraction and engineering activities on ground subsidence. The degree and law of ground subsidence inducedby deep porous geothermal water extraction are still unclear. The research on the engineering characteristics andconsolidation features of deep stratum soil is of great significance for the rational development and utilization ofdeep groundwater resources and geothermal resources. In this paper, by using the full core drilling that can exposethe Cenozoic strata at a glance during construction in the central urban area of Tianjin, the sedimentary environmentand engineering characteristics of the Cenozoic soil layer were systematically studied, and the critical water level ofground subsidence was preliminarily discussed. The research results show that the sedimentary environment has acertain degree of influence on the physical and mechanical properties and consolidation characteristics of the strata.The water content, porosity ratio and liquid property index of lacustrine and Marine strata are relatively high, andthe density is relatively low. The deposition in floodplain basins is the opposite. High compressibility and undercon-solidated strata are mostly found in lacustrine and Marine sediments, while over-consolidated strata are mainly pres-ent in floodplain basin sediments. The strata in the 0-160 m section are in a normal consolidation state and there isno critical water level. The stratum in the 160-630 m section is in a super-consolidated state. To prevent groundsubsidence, the water level should be within the control critical water level depth. The strata in the 630-1300 m sec-tion are in an under-consolidated -normally consolidated state, and there is no critical water level. For the develop-ment and utilization of pore-type geothermal resources, recharge measures should be strictly adopted to ensure thestability of the water level and avoid ground subsidence. |
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