WO2019056410A1 - 一种既有路基、边坡稳定性的监测结构及其施工方法 - Google Patents
一种既有路基、边坡稳定性的监测结构及其施工方法 Download PDFInfo
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- WO2019056410A1 WO2019056410A1 PCT/CN2017/104484 CN2017104484W WO2019056410A1 WO 2019056410 A1 WO2019056410 A1 WO 2019056410A1 CN 2017104484 W CN2017104484 W CN 2017104484W WO 2019056410 A1 WO2019056410 A1 WO 2019056410A1
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- Prior art keywords
- slope
- roadbed
- geogrid
- sensitive
- long strip
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/20—Securing of slopes or inclines
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/20—Securing of slopes or inclines
- E02D17/202—Securing of slopes or inclines with flexible securing means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
- G01B7/18—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge using change in resistance
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/24—Earth materials
Definitions
- the invention belongs to the field of civil engineering, and particularly relates to a stability monitoring structure and a construction method for an existing roadbed and a slope based on a smart geosynthetic material.
- an object of the present invention is to provide a monitoring structure having a roadbed and slope stability and a construction method thereof.
- the sensitivity of the sensitive geosynthetic material is utilized, and the utility model can be applied to the existing roadbed, slope and retaining wall, and the stability can be monitored to solve the stability of the existing roadbed and slope. Sexuality cannot be monitored with sensitive geosynthetics.
- the technical solution of the present invention is:
- a monitoring structure having both roadbed and slope stability, including a roadbed or slope to be monitored and a plurality of long strips of sensitive geosynthetic composite devices;
- Multiple vertical bores are drilled along the width of the subgrade or slope, or multiple transverse bores are drilled along its vertical direction, and a long strip is embedded in each vertical or lateral borehole.
- a smart geocomposite composite device, and a long strip of malleable geosynthetic composite device is embedded deep into the predicted slip surface of the subgrade or slope; the long strip of sensitive geosynthetic composite device and the inner wall of the borehole The gap between the gaps is dense, so that the stress environment of the long strip-shaped sensitive composite material composite device is close to the internal environment of the roadbed or slope;
- the long strip type sensitive synthetic composite material device comprises a geogrid, a wire and a heat shrinkable tube, the geogrid is elongated, the wires are arranged along the length direction of the geogrid, and the wire and geotechnical are set at every distance.
- the grids are fixedly connected, each fixed point forming a measuring point, the heat shrinkable tube is wrapped outside the geogrid, and the free end of the wire is led out of the heat shrinkable tube.
- Geogrid The grid is a two-dimensional grid or a certain height of a three-dimensional grid screen that is thermoformed or molded with a polymer such as polypropylene or polyvinyl chloride. When used as a civil engineering project. Become a geogrid.
- Heat shrinkable tube is a polyolefin heat shrinkable sleeve with high temperature shrinkage, soft flame retardant and insulation corrosion resistance.
- Conductive adhesive is an adhesive that has certain electrical conductivity after curing or drying.
- the long strip-shaped intelligent composite material composite device When the drilling direction is set in the horizontal direction (horizontal direction) or the vertical direction (vertical direction), the long strip-shaped intelligent composite material composite device is perpendicular to the direction of the force, and is more likely to be deformed, thereby generating a signal.
- Wrapping the heat-shrinkable tube on the outside of the geogrid can effectively prevent the sensitive geosynthetic material from being affected by water in the soil.
- the wire By pulling out the free end of the wire, the wire can be connected to the data acquisition instrument.
- the data acquisition instrument can monitor the resistance value of each measurement point to facilitate subsequent data analysis.
- the wires at each measuring point are bonded to the geogrid by a conductive adhesive and fixed by tape.
- the distance between adjacent measuring points is 0.5-1 m.
- each measuring point is fixed in the middle of the geogrid.
- the fixing to the middle position is to make each measuring point on the same force section, and the error of the measured data can be minimized.
- the wires between adjacent measuring points are straight.
- the geogrid is deformed by force, and the wire is deformed accordingly, which can provide better detection sensitivity.
- the strip-shaped smart geocomposite composite device has a width of 5-10 cm, and the length is determined according to requirements.
- the heat-shrinkable tube is a heat-shrinkable tube containing a double-layer structure
- the outer layer material is a polyolefin alloy material
- the inner layer material is a hot melt adhesive
- a hot melt is a plasticity binder whose physical state changes with temperature over a range of temperatures.
- Polyolefin alloy materials have the advantages of softness, low temperature shrinkage, insulation, corrosion resistance and wear resistance.
- the inner layer has the advantages of low melting point, good adhesion, good waterproof sealing performance and the like.
- the heat-containing tube is wrapped on the outside of the geogrid and the wire, and after heating to 84 ° C - 120 ° C, the heat-containing tube is heated and shrunk, and the inner layer of hot-melt glue is melted, so that the geogrid and the wire are tightly wrapped.
- the distance between adjacent boreholes is 1-2 m.
- each bore has a diameter of 8-15 cm.
- a monitoring system with roadbed and slope stability includes the above-mentioned existing roadbed, slope stability monitoring structure and data acquisition instrument, and the wires of the monitoring structure are connected with the data acquisition instrument.
- the above construction method of the monitoring structure of the existing roadbed and slope stability includes the following steps:
- a transverse drilling hole is made every 1-2 m along its vertical direction;
- step 3 different soil slopes or roadbeds are filled with different materials to fill the gap.
- the cement soil is used for filling, the soil is bentonite, the mass percentage of the cement is 10%-15%, and the water cement ratio of the cement slurry is 1.
- the material itself when subjected to an external force, the material itself is deformed, and the resistivity of two adjacent measuring points at the deformation of the soil changes significantly.
- the real-time data to find the two measurement points with the most obvious change in resistivity, analyze and judge the position and orientation of the slip surface of the soil, and monitor the evolution process of the slip surface.
- Figure 1 is a schematic view showing the arrangement of the wires of the smart geosynthetic material
- FIG. 2 is a schematic cross-sectional view of a smart geosynthetic material
- Figure 3 is a cross-sectional view of the lateral arrangement of the smart geosynthetic material
- FIG. 4 is a schematic structural view of a laterally arranged smart synthetic material
- Figure 5 is a cross-sectional view of the vertically arranged smart synthetic material
- Figure 6 is a schematic view showing the vertical arrangement of the malleable geosynthetic material.
- a monitoring structure having both roadbed and slope stability including a roadbed or slope 9 to be monitored and a plurality of long strips of sensitive geosynthetic composite device 7;
- each bore has a diameter of 8-15 cm, preferably 8 -10 cm, further preferably 10 cm.
- a long strip of malleable geosynthetic composite device 7 is embedded in each of the vertical or lateral boreholes, and the depth of the long strip of the malleable geosynthetic composite device 7 is predicted to pass through the subgrade or slope.
- the long strip-shaped intelligent composite material composite device 7 comprises a geogrid 4, a wire 3 and a heat shrinkable tube 5, and the geogrid 4 is elongated, and the wire is along the geogrid.
- 4 is arranged in the longitudinal direction, and is fixedly connected between the wire 3 and the geogrid 4 every set distance, and each fixed point forms a measuring point, and the distance between adjacent measuring points is 0.5-1 m, preferably 0.7- 1 m, further preferably 1 m, between each of the wires 2 at the measuring point 2 and the geogrid 4 is bonded by a conductive paste 1 and fixed with a tape, and each measuring point 2 is fixed at an intermediate position of the geogrid 4.
- the wire 3 Before fixing the wire 3, the wire 3 should be straightened. When the wire 3 is straightened, the geogrid 4 is deformed by force, and the wire 3 is deformed accordingly, which has better detection sensitivity.
- the heat shrinkable tube 5 is wrapped around the outside of the geogrid 4, and the free end of the wire 3 is taken out of the heat shrinkable tube 5.
- the heat-shrinkable tube 5 is a heat-shrinkable tube containing a double-layer structure, the outer layer material is a polyolefin alloy material, and the inner layer material is a hot melt adhesive. After the wire 3 is fixed on the geogrid 4, the heat-containing tube is wrapped on the outside of the geogrid 4 and the wire 3. After heating to 84 ° C - 120 ° C, the heat-containing tube is heated and shrunk, and the inner layer of hot-melt glue is melted. It is convenient to tightly wrap the geogrid 4 and the wire 3.
- Horizontal embedding suitable for high roadbed and high slope.
- the cement mortar fills the gap; for the soft soil slope, the crack is filled with bentonite mud, and the bentonite mud contains water, bentonite, alkali, and cellulose.
- the cement is used to fill the gap, the soil is selected from bentonite, the cement is P ⁇ C32.5, the cement blending ratio is 10% to 15%, and the cement slurry has a water-cement ratio of 1.
- the hole is sealed with mortar outside the hole.
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- General Physics & Mathematics (AREA)
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- Civil Engineering (AREA)
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- General Health & Medical Sciences (AREA)
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- Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
- Testing Or Calibration Of Command Recording Devices (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
Description
Claims (10)
- 一种既有路基、边坡稳定性的监测结构,其特征在于:包括待监测路基或边坡和多个长条状机敏性土工合成材料复合装置;沿路基或边坡的宽度方向上钻有多个竖向钻孔,或沿其竖直方向上钻有多个横向钻孔,每个竖向钻孔或横向钻孔中埋设有一个长条状机敏性土工合成材料复合装置,且长条状机敏性土工合成材料复合装置埋入的深度穿过路基或边坡的预测滑裂面;长条状机敏性土工合成材料复合装置与钻孔内壁之间的缝隙填充密实,使得长条状机敏性土工合成材料复合装置的受力环境与路基或边坡的内部环境接近;所述长条状机敏性土工合成材料复合装置包括土工格栅、导线和热缩管,土工格栅为长条状,导线沿土工格栅的长度方向布置,且每隔设定距离导线与土工格栅之间固定连接,每个固定点形成一个测点,所述热缩管包裹在土工格栅的外部,且将导线的自由端引出热缩管。
- 根据权利要求1所述的监测结构,其特征在于:每个测点处导线与土工格栅之间通过导电胶粘结,并用胶带固定。
- 根据权利要求2所述的监测结构,其特征在于:相邻测点之间的距离为0.5-1m。
- 根据权利要求1所述的监测结构,其特征在于:每个测点固定在土工格栅的中间位置;优选的,相邻测点之间的导线是绷直的。
- 根据权利要求1所述的监测结构,其特征在于:所述热缩管为含胶热缩管,为双层结构,外层的材料为聚烯烃合金材料,内层的材料为热熔胶。
- 根据权利要求1所述的监测结构,其特征在于:相邻钻孔之间的距离为1-2m;每个钻孔的直径为8-15cm。
- 一种既有路基、边坡稳定性的监测***,其特征在于:包括上述既有路基、边坡稳定性的监测结构和数据采集仪,所述监测结构的导线与数据采集仪连接。
- 权利要求1-6任一所述既有路基、边坡稳定性的监测结构的施工方法,其特征在于:包括如下步骤:1)沿路基或边坡的宽度方向上打多个竖向钻孔,或沿其竖直方向上打多个横向钻孔;2)将长条状机敏性土工合成材料复合装置套入塑料管中,送入钻孔中,使其在钻孔中送入的距离穿过路基或边坡的预测滑裂面;3)将钻孔与长条状机敏性土工合成材料复合装置之间的缝隙进行填充,填充时,将塑料管缓慢取出,每填充1.5-2.5m的距离就将塑料管往外取出相应的距离,直到填充结束,填充过程中保证塑料管底部浸没在填充物里;4)将长条状机敏性土工合成材料复合装置的导线引出,并将导线与数据采集仪连接,测出每个测点上的电阻值,找到电阻值变化最大的两个测点,进而判断土体滑裂面的位置、方位,监测滑裂面的演变过程。
- 根据权利要求8所述的施工方法,其特征在于:当路基或边坡为高路基、高边坡时;沿其竖直方向每隔1-2m打一个横向钻孔;或,当路基或边坡为宽路基、宽边坡时,沿其宽度方向每隔1-2m打一个竖向钻孔。
- 根据权利要求8所述的施工方法,其特征在于:步骤3)中,不同土质的边坡或路基选用不同材料填充缝隙;优选的,对于软岩石或风化岩边坡或路基,采用水泥砂浆比为1:1的M20水泥砂浆进行填充;对于硬岩石边坡或路基,采用水泥砂浆比为1:1的M30水泥砂浆进行填充;对于软土边坡或路基,采用膨润土泥浆进行填充,膨润土泥浆中水、膨润土、碱和纤维素的质量比为1000:60-100:2-5:2-5;对于硬土边坡,采用水泥土进行填充,土为膨润土,水泥掺入质量百分数为10%-15%,水泥浆的水灰比为1。
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