WO2020244123A1 - 振杆密实法处理湿陷性黄土地基的方法 - Google Patents

振杆密实法处理湿陷性黄土地基的方法 Download PDF

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WO2020244123A1
WO2020244123A1 PCT/CN2019/112587 CN2019112587W WO2020244123A1 WO 2020244123 A1 WO2020244123 A1 WO 2020244123A1 CN 2019112587 W CN2019112587 W CN 2019112587W WO 2020244123 A1 WO2020244123 A1 WO 2020244123A1
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vibration
vibrating
construction
wing
collapsible loess
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PCT/CN2019/112587
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English (en)
French (fr)
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章定文
刘松玉
杜广印
杨泳
毛忠良
高常辉
曾彪
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东南大学
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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
    • E02D3/02—Improving by compacting
    • E02D3/046—Improving by compacting by tamping or vibrating, e.g. with auxiliary watering of the soil
    • E02D3/054—Improving by compacting by tamping or vibrating, e.g. with auxiliary watering of the soil involving penetration of the soil, e.g. vibroflotation
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
    • E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
    • E02D3/123—Consolidating by placing solidifying or pore-filling substances in the soil and compacting the soil

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  • the invention relates to collapsible loess foundation treatment technology, in particular to a method for treating collapsible loess foundation by vibrating rod compaction method, and belongs to the technical field of foundation treatment methods.
  • collapsible loess Due to its special engineering properties, collapsible loess is difficult to meet the requirements of the overlying buildings for the bearing capacity and stability of the foundation when it is used as a natural foundation, and it must be reinforced accordingly.
  • Commonly used methods for treatment of collapsible loess foundations include dynamic compaction, soil replacement cushion method, compaction pile method and chemical reinforcement method. These methods have their own scope of application and advantages, as well as certain limitations.
  • the heavy vibration and noise generated during the construction process of the dynamic compaction method will have a greater impact on the lives of surrounding residents; the dust pollution caused by the lime soil before the construction, and the strong alkaline soil after the construction affects the surrounding soil environment
  • the chemical reinforcement method is expensive to deal with, and it is far from reaching the stage of widespread application. It is rarely used in actual projects and is generally used for emergency treatment.
  • the purpose of the present invention is to address the many shortcomings of the existing collapsible loess foundation treatment methods, and to provide a vibrating rod compaction method to treat collapsible loess foundations, improve the compactness of the foundation, eliminate the collapsibility of the soil layer, and make it Meet the requirements of engineering construction in the loess area.
  • a method for treating collapsible loess foundation with vibrating rod compaction method includes the following steps:
  • Construction preparation level the construction site and remove debris; compile the construction plan according to the construction drawings, and make the plane layout;
  • Vibration point positioning use a crawler crane to hoist the special vibrating wing to the designated point and center, adjust the verticality of the vibrating wing;
  • the liquid injection mechanism is connected to the nozzle on the special vibrating wing to spray the foundation at high pressure, and the actual injection volume is controlled by the injection pressure and time;
  • Vibration sinking Start the vibrating hammer according to the design frequency, and control the pay-off speed of the crawler crane to make the special vibrating wing produce vertical vibration and polarization under the action of the weight and vibration force of the vibrating hammer to the design depth;
  • Vibration lift The crawler crane slowly lifts the vibrating wing that continues to vibrate, closes the liquid injection valve when lifting, and starts the air injection mechanism until the vibrating wing is lifted to the surface;
  • Backfill and reverse insertion Use plain soil to backfill the settlement space above the vibrating hole, and then use a vibrating wing to reverse insert the vibrating hole;
  • the pre-designed vibration point spacing adopt a triangle or square point layout method, and carry out the vibration point construction in sequence until the end of the construction.
  • step 3 adopts industrial waste liquid with a solution concentration of 0.05 mol/L to 0.3 mol/L during the vibration and liquid injection.
  • step 5 the time range of the vibration retention at the bottom of the hole is 10s to 90s.
  • step 7) the number of times of the backfill and reverse insertion process is at least once.
  • the range of the vibrating point spacing in step 8) is 1.0m to 1.8m.
  • the invention When processing the collapsible loess foundation, the invention does not require additional fillers, has significant economic benefits, and is convenient and simple in construction.
  • Reasonably designed vibrating wing is conducive to sinking into the deep part of the soil and transferring the vibration energy to the surrounding soil in the best way, thereby improving the compactness of the foundation, eliminating the collapsibility of the soil, and making it meet the requirements of engineering construction in the loess area .
  • Figure 1 is a flow chart of the operation method of vibrating rod compaction method to treat collapsible loess foundation.
  • Figure 2 is a schematic diagram of vibrating rod high pressure injection.
  • Figure 3 is the movement route diagram of the bottom end of the vibrating wing during the construction of vibrating rod compaction method.
  • the operation method of vibrating rod compaction method to treat collapsible loess foundation includes the following steps:
  • Construction preparation level the construction site and remove debris; compile the construction plan according to the construction drawings, and make the plane layout;
  • Vibration point positioning use a crawler crane to hoist the special vibrating wing 2 to the designated position and center, adjust the verticality of the vibrating wing 2;
  • the liquid injection mechanism is connected to the nozzle on the special vibrating wing 2 to spray liquid 3 at high pressure to the foundation.
  • the actual injection volume is controlled by the injection pressure and time; the injection adopts a solution concentration of 0.05 mol/L ⁇ 0.3mol/L industrial waste liquid.
  • Vibration sinking Start the vibrating hammer 1 according to the design frequency, and control the pay-off speed of the crawler crane to make the special vibrating wing 2 produce vertical vibration and polarization under the weight and vibration force of the vibrating hammer 1 to the design depth.
  • the vibrating wing 2 sinks, it is necessary to continuously observe its stability, verticality and falling depth;
  • Vibration retention is performed when the vibrating wing 2 sinks to the design treatment depth, and the retention time is 10s ⁇ 90s, and 30s is used in this embodiment;
  • Vibration lift The crawler crane slowly lifts the vibrating wing 2 that continues to vibrate, closes the liquid injection valve when lifting, and starts the air injection mechanism until the vibrating wing 2 is lifted to the surface;
  • the vibration point spacing is 1.1m, using a triangle or square layout method, and the vibration point construction is carried out in sequence until the end of the construction.

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Soil Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Agronomy & Crop Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
  • Foundations (AREA)

Abstract

本发明公开一种振杆密实法处理湿陷性黄土地基的方法，该方法包括以下步骤：1)施工准备；2)振点定位；3)振动与注液；4)振动下沉；5)孔底留振；6)振动提升；7)回填反插；8)提升结束。施工中按照预先设计的振点间距，采用三角形或者正方形布点方式，依次进行振点施工，直至加固区施工结束。所述振动中的注液为工业废液，它能与黄土中的碳酸钙等成分反应，进而加速"软化"土体，有利于振动翼的振动下沉。所述孔底留振的时间不小于10s。所述回填反插工艺的次数至少1次。所述振点间距的范围为1.0m～1.8m。本发明在对湿陷性黄土地基进行处理时，无需额外填料，经济效益显著，且施工方便、简单。

Description

振杆密实法处理湿陷性黄土地基的方法 技术领域
本发明涉及湿陷性黄土地基处理技术，具体涉及一种振杆密实法处理湿陷性黄土地基的方法，属于地基处理方法的技术领域。
背景技术
湿陷性黄土由于其特殊的工程性质，在作为天然地基使用时，难以满足其上覆建筑物对于地基承载力和稳定的要求，必须对其进行相应的加固处理。常用的湿陷性黄土地基处理方法有强夯法、换土垫层法、挤密桩法和化学加固法等，这些方法都有其各自的适用范围和优势，以及一定的局限性。如强夯法施工过程中会产生的较大振动与噪音，对周边居民的生活造成较大的影响；灰土在施工前造成的扬尘污染，以及施工后土体强碱性对周边土体环境影响严重，不利于节约型土地资源再利用；化学加固法处理成本高昂，且远未达到广泛推广应用阶段，实际工程中应用较少，一般用于紧急事故处理。
随着国家西部大开发战略的稳步推进和岩土工程可持续发展要求的提出，探索和研发同时具备工程适用性、环境友好和经济效益显著等特点的新型地基处理方法，为湿陷性黄土地基处理提出了新的挑战。振杆密实法，作为可液化地基处理的一种新方法，施工时无需额外的填料，经济效益显著，且施工方便、简单，加固效果好，为环境友好型的地基处理方法。但关于振杆密实法处理湿陷性黄土地基的应用研究目前还是一片空白。
发明内容
本发明的目的是针对现有湿陷性黄土地基处理方法的诸多不足，提供一种振杆密实法处理湿陷性黄土地基的方法，提高地基的密实度，消除土层湿陷性，使其满足黄土地区工程建设的要求。
本发明的上述目的可通过以下技术方案来实现：
一种振杆密实法处理湿陷性黄土地基的方法，该方法包括如下步骤：
1)施工准备：施工场地平整，清除杂物；依据施工图编制施工方案，做好平面布置；
2)振点定位：采用履带吊机将特制的振动翼吊至指定点位并对中，调整振动翼垂直度；
3)振动与注液：注液机构连接特制振动翼上的喷嘴对地基进行高压喷液，实际注液量由注液压力和时间控制；
4)振动下沉：根据设计频率启动振动锤，控制履带吊机放线速度使特制振动翼在振锤自重和振动力作用下产生竖向振动和偏振，直至设计深度；
5)孔底留振：待振动翼下沉至设计处理深度时进行留振；
6)振动提升：履带吊机将持续振动的振动翼缓慢提升，提升时关闭注液阀门，启动注气机构，直至振动翼提升至地表；
7)回填反插：使用素土将振孔上部沉降空间进行回填，之后采用振动翼对振孔进行反插；
8)提升结束：提升振动翼，施工设备移位，进行下一振点施工；
按照预先设计的振点间距，采用三角形或者正方形布点方式，依次进行振点施工，直至施工结束。
所述的振杆密实法处理湿陷性黄土地基的操作方法，步骤3)所述振动与注液时采用溶液浓度为0.05mol/L～0.3mol/L的工业废液。
所述的振杆密实法处理湿陷性黄土地基的操作方法，步骤5)所述孔底留振的时间范围为10s～90s。
所述的振杆密实法处理湿陷性黄土地基的操作方法，步骤7)所述回填反插工艺的次数至少1次。
所述的振杆密实法处理湿陷性黄土地基的操作方法，步骤8)所述振点间距的范围为1.0m～1.8m。
有益效果：
本发明在对湿陷性黄土地基进行处理时，无需额外填料，经济效益显著，且施工方便、简单。合理设计的振动翼，有利于沉入土体深部并将振动能量以最佳方式向周围土层传递，进而提高地基的密实度，消除土层湿陷性，使其满足黄土地区工程建设的要求。
附图说明
图1为振杆密实法处理湿陷性黄土地基的操作方法流程图。
图2为振杆高压注液示意图。
图3为振杆密实法施工过程中振动翼底端的移动路线图。
图中标号说明：1-振动锤，2-振动翼；3-高压注液。
具体实施方式
下面结合附图和具体实施例对本发明作进一步的详细说明。
参照附图1，图2和图3。
振杆密实法处理湿陷性黄土地基的操作方法，包括以下步骤：
1)施工准备：施工场地平整，清除杂物；依据施工图编制施工方案，做好平面布置；
2)振点定位：采用履带吊机将特制的振动翼2吊至指定点位并对中，调整振动翼2垂直度；
3)振动与注液：注液机构连接特制振动翼2上的喷嘴对地基进行高压喷液3，实际注液量由注液压力和时间控制；注液采用采用溶液浓度为0.05mol/L～0.3mol/L的工业废液。
4)振动下沉：根据设计频率启动振动锤1，控制履带吊机放线速度使特制振动翼2在振锤1自重和振动力作用下产生竖向振动和偏振，直至设计深度。振动翼2下沉过程要持续观察其稳定性、垂直度和下落深度；
5)孔底留振：待振动翼2下沉至设计处理深度时进行留振，留振时间为10s～90s，本实施例中采用30s；
6)振动提升：履带吊机将持续振动的振动翼2缓慢提升，提升时关闭注液阀门，启动注气机构，直至振动翼2提升至地表；
7)回填反插：使用素土将振孔上部沉降空间进行回填，之后采用振动翼2对振孔进行反插1次；
8)提升结束：提升振动翼2，施工设备移位，进行下一振点施工；
9)按照预先设计的振点间距的范围为1.0m～1.8m，本实施例中振 点间距1.1m，采用三角形或者正方形布点方式，依次进行振点施工，直至施工结束。
以上所述仅是本发明的优选实施方式，应当指出：对于本技术领域的普通技术人员来说，在不脱离本发明原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视为本发明的保护范围。

Claims (5)

  1. 一种振杆密实法处理湿陷性黄土地基的方法，该方法包括如下步骤：
    1)施工准备：施工场地平整，清除杂物；依据施工图编制施工方案，做好平面布置；
    2)振点定位：采用履带吊机将特制的振动翼吊至指定点位并对中，调整振动翼垂直度；
    3)振动与注液：注液机构连接特制振动翼上的喷嘴对地基进行高压喷液，实际注液量由注液压力和时间控制；
    4)振动下沉：根据设计频率启动振动锤，控制履带吊机放线速度使特制振动翼在振锤自重和振动力作用下产生竖向振动和偏振，直至设计深度；
    5)孔底留振：待振动翼下沉至设计处理深度时进行留振；
    6)振动提升：履带吊机将持续振动的振动翼缓慢提升，提升时关闭注液阀门，启动注气机构，直至振动翼提升至地表；
    7)回填反插：使用素土将振孔上部沉降空间进行回填，之后采用振动翼对振孔进行反插；
    8)提升结束：提升振动翼，施工设备移位，进行下一振点施工；
    按照预先设计的振点间距，采用三角形或者正方形布点方式，依次进行振点施工，直至施工结束。
  2. 根据权利要求1所述的振杆密实法处理湿陷性黄土地基的操作方法，其特征在于，步骤3)所述振动与注液时采用溶液浓度为 0.05mol/L～0.3mol/L的工业废液。
  3. 根据权利要求1所述的振杆密实法处理湿陷性黄土地基的操作方法，其特征在于，步骤5)所述孔底留振的时间范围为10s～90s。
  4. 根据权利要求1所述的振杆密实法处理湿陷性黄土地基的操作方法，其特征在于，步骤7)所述回填反插工艺的次数至少1次。
  5. 根据权利要求1所述的振杆密实法处理湿陷性黄土地基的操作方法，其特征在于，步骤8)所述振点间距的范围为1.0m～1.8m。
PCT/CN2019/112587 2019-06-04 2019-10-22 振杆密实法处理湿陷性黄土地基的方法 WO2020244123A1 (zh)

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CN117344711A (zh) * 2023-11-21 2024-01-05 中铁一局集团有限公司第三工程分公司 一种湿陷性黄土地基处理设备及方法

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CN111058443B (zh) * 2019-12-19 2021-06-22 建华建材（中国）有限公司 一种消除黄土湿陷性的预制桩复合地基施工方法
CN111676950A (zh) * 2020-05-08 2020-09-18 江苏盛泰建设工程有限公司 一种湿陷性黄土的加固方法及其加固桩机
CN111593721A (zh) * 2020-05-28 2020-08-28 中铁第五勘察设计院集团有限公司 一种湿陷性黄土地基加固方法
CN113174937A (zh) * 2021-04-12 2021-07-27 东南大学 气动振杆密实法处理软黏土层和液化土层交互地基的方法
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