JPH0415038B2 - - Google Patents
Info
- Publication number
- JPH0415038B2 JPH0415038B2 JP62207506A JP20750687A JPH0415038B2 JP H0415038 B2 JPH0415038 B2 JP H0415038B2 JP 62207506 A JP62207506 A JP 62207506A JP 20750687 A JP20750687 A JP 20750687A JP H0415038 B2 JPH0415038 B2 JP H0415038B2
- Authority
- JP
- Japan
- Prior art keywords
- excavated soil
- water
- cement
- weight
- parts
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000002689 soil Substances 0.000 claims description 70
- 239000000126 substance Substances 0.000 claims description 33
- 150000001768 cations Chemical class 0.000 claims description 15
- 239000004568 cement Substances 0.000 claims description 14
- 239000011396 hydraulic cement Substances 0.000 claims description 14
- 238000002156 mixing Methods 0.000 claims description 13
- 150000003839 salts Chemical class 0.000 claims description 12
- 239000011398 Portland cement Substances 0.000 claims description 11
- 239000011347 resin Substances 0.000 claims description 11
- 229920005989 resin Polymers 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 10
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 6
- 229920003169 water-soluble polymer Polymers 0.000 claims description 5
- 238000009412 basement excavation Methods 0.000 claims description 3
- 150000003841 chloride salts Chemical class 0.000 claims description 3
- 150000004679 hydroxides Chemical class 0.000 claims description 3
- 150000002823 nitrates Chemical class 0.000 claims description 3
- 150000003467 sulfuric acid derivatives Chemical class 0.000 claims description 3
- 229920001059 synthetic polymer Polymers 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims description 2
- 239000010881 fly ash Substances 0.000 claims description 2
- 230000000737 periodic effect Effects 0.000 claims description 2
- 238000012986 modification Methods 0.000 claims 1
- 230000004048 modification Effects 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 18
- 230000000694 effects Effects 0.000 description 9
- CERQOIWHTDAKMF-UHFFFAOYSA-M Methacrylate Chemical compound CC(=C)C([O-])=O CERQOIWHTDAKMF-UHFFFAOYSA-M 0.000 description 7
- 229920002554 vinyl polymer Polymers 0.000 description 7
- 229920002907 Guar gum Polymers 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 235000010417 guar gum Nutrition 0.000 description 6
- 239000000665 guar gum Substances 0.000 description 6
- 229960002154 guar gum Drugs 0.000 description 6
- 239000003795 chemical substances by application Substances 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 3
- 239000011400 blast furnace cement Substances 0.000 description 3
- 239000011575 calcium Substances 0.000 description 3
- 229910052791 calcium Inorganic materials 0.000 description 3
- 150000004676 glycans Chemical class 0.000 description 3
- 229920000591 gum Polymers 0.000 description 3
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 description 3
- 229910000360 iron(III) sulfate Inorganic materials 0.000 description 3
- 239000003129 oil well Substances 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 229920001282 polysaccharide Polymers 0.000 description 3
- 239000005017 polysaccharide Substances 0.000 description 3
- 229920001285 xanthan gum Polymers 0.000 description 3
- 235000010493 xanthan gum Nutrition 0.000 description 3
- 239000000230 xanthan gum Substances 0.000 description 3
- 229940082509 xanthan gum Drugs 0.000 description 3
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 description 2
- 239000001110 calcium chloride Substances 0.000 description 2
- 229910001628 calcium chloride Inorganic materials 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 230000003311 flocculating effect Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000008719 thickening Effects 0.000 description 2
- -1 xancort Polymers 0.000 description 2
- SATHPVQTSSUFFW-UHFFFAOYSA-N 4-[6-[(3,5-dihydroxy-4-methoxyoxan-2-yl)oxymethyl]-3,5-dihydroxy-4-methoxyoxan-2-yl]oxy-2-(hydroxymethyl)-6-methyloxane-3,5-diol Chemical compound OC1C(OC)C(O)COC1OCC1C(O)C(OC)C(O)C(OC2C(C(CO)OC(C)C2O)O)O1 SATHPVQTSSUFFW-UHFFFAOYSA-N 0.000 description 1
- 244000215068 Acacia senegal Species 0.000 description 1
- 239000001904 Arabinogalactan Substances 0.000 description 1
- 229920000189 Arabinogalactan Polymers 0.000 description 1
- 241000416162 Astragalus gummifer Species 0.000 description 1
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 235000017788 Cydonia oblonga Nutrition 0.000 description 1
- 108010010803 Gelatin Proteins 0.000 description 1
- 229920000084 Gum arabic Polymers 0.000 description 1
- VQTUBCCKSQIDNK-UHFFFAOYSA-N Isobutene Chemical group CC(C)=C VQTUBCCKSQIDNK-UHFFFAOYSA-N 0.000 description 1
- 229920000161 Locust bean gum Polymers 0.000 description 1
- 244000134552 Plantago ovata Species 0.000 description 1
- 235000003421 Plantago ovata Nutrition 0.000 description 1
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 239000009223 Psyllium Substances 0.000 description 1
- 229920002125 Sokalan® Polymers 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 229920001615 Tragacanth Polymers 0.000 description 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 235000010489 acacia gum Nutrition 0.000 description 1
- 239000000205 acacia gum Substances 0.000 description 1
- 235000010443 alginic acid Nutrition 0.000 description 1
- 229920000615 alginic acid Polymers 0.000 description 1
- 150000004645 aluminates Chemical class 0.000 description 1
- 235000019312 arabinogalactan Nutrition 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 1
- 150000001642 boronic acid derivatives Chemical class 0.000 description 1
- 239000001768 carboxy methyl cellulose Substances 0.000 description 1
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 1
- 229920003090 carboxymethyl hydroxyethyl cellulose Polymers 0.000 description 1
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 1
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical class [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 229920000159 gelatin Polymers 0.000 description 1
- 239000008273 gelatin Substances 0.000 description 1
- 235000019322 gelatine Nutrition 0.000 description 1
- 235000011852 gelatine desserts Nutrition 0.000 description 1
- 235000010420 locust bean gum Nutrition 0.000 description 1
- 239000000711 locust bean gum Substances 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 150000002927 oxygen compounds Chemical class 0.000 description 1
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 description 1
- 229920002401 polyacrylamide Polymers 0.000 description 1
- 239000004584 polyacrylic acid Substances 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 229920000036 polyvinylpyrrolidone Polymers 0.000 description 1
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 description 1
- 239000001267 polyvinylpyrrolidone Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 229940070687 psyllium Drugs 0.000 description 1
- 238000002407 reforming Methods 0.000 description 1
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 229940032147 starch Drugs 0.000 description 1
- 230000009974 thixotropic effect Effects 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Landscapes
- Treatment Of Sludge (AREA)
Description
ａ 産業上の利用分野
本発明は、石油井、ガス井、地熱井等の掘削、
トンネル工事その他の土木工事あるいは建設基礎
工事などで発生する掘削土を、再利用に適する形
態あるいは廃棄が容易な形態にするための掘削土
の改質方法に関する。
ｂ 従来の技術
一般に、石油井、ガス井、地熱井等の掘削、土
木工事などで発生する掘削土は、地域によつて異
なるが、通常約20〜90％の含水率を有している。
このように多量の水分を含有している掘削土
は、従来、セメント系固化剤を混合することによ
り処理されていた。
ｃ 発明が解決しようとする課題
しかしながら、上記のセメント系固化剤を用い
る掘削土の処理方法には、処理後の掘削土が流動
性を失い、必要以上の強度に達するまでに、長時
間（24〜48時間）を要するという欠点があつた。
また、固化後の掘削土に、必要以上の強度を付
与するためには、セメント系固化剤を多量に添加
する必要があるが（通常は４〜８重量％）、セメ
ント系固化剤を４重量％以上添加すると、PHが12
以上になり、処理工程中におけるPHの調整が難し
いという欠点があつた。
本発明は、上記のような問題点に鑑みてなされ
たものであつて、その目的は、掘削土を再利用に
適する形態あるいは廃棄が容易な形態になるよう
に、効率良く固化処理する掘削土の改質方法を提
供することにある。
ｄ 課題を解決するための手段
本発明の要旨は、掘削の際に生ずる掘削土100
重量部に対して、天然水溶性高分子物質、その半
合成高分子物質、凝集性を有する合成水溶性高分
子物質および吸水性樹脂から選ばれた少なくとも
１種の高分子物質0.03〜0.7重量部と２価以上の
陽イオンを含有する塩類0.1〜1.6重量部を添加混
合し、次いで、水硬性セメント0.6〜4.5重量部を
混合せしめることを特徴とする掘削土の改質方法
にある。
本発明によつて改質することができる掘削土
は、石油井、ガス井、地熱井等の掘削の際、ある
いはトンネル工事その他の土木工事の際などに発
生するものであり、地域によつて異なるが、通常
約20〜90％の含水率を有している。
本発明によつて改質することができる掘削土の
含水率は20〜90％であるが、好ましくは20〜50％
であり、とくに効果的に改質することができる。
本発明の掘削土の改質方法においては、まず、
掘削土に対して、天然水溶性高分子物質、その半
合成高分子物質、凝集性を有する合成水溶性高分
子物質および吸水性樹脂から選ばれた少なくとも
１種の高分子物質を添加混合する。
上記天然水溶性高分子物質またはその半合成高
分子物質としては、グアーガム、ローカストビー
ンガム、クインスシードガム、アラビノガラクタ
ンガム、アラビアガム、トラガカントガム、澱
粉、ザンサンガム、ザンコート、ゼラチン、サイ
リユームガム、アルギン酸塩類、カルボキシメチ
ルセルロース、カルボキシメチルハイドロオキシ
エチルセルロースなどを用いることができる。
また、上記凝集性を有する合成水溶性高分子物
質としては、ポリビニルアルコール、ポリビニル
ピロリドン、ポリビニルメタアクリレート、ポリ
アクリルアミド、ポリアクリル酸ソーダ、ポリエ
チレンオキサイド、ビーガムなどを用いることが
できる。
さらに、上記吸水性樹脂としては、ポリアクリ
ル酸系、ポリサツカライト系、またはこれらの共
重合体系、イソブチレン、無水マレイン酸共重合
体系などの樹脂で代表される吸水性樹脂を用いる
ことができる。
これらの高分子物質は、水溶性であり、かつ増
粘性、保水性、吸水性および凝集性を有するもの
であり、本発明に効果的に用いることができる。
これら高分子物質の掘削土に対する添加量は、
掘削土の種類あるいは含水率によつても異なる
が、通常は掘削土100重量部（１Kl）に対して
0.03〜0.7重量部（0.5〜９Kg）である。
高分子物質の添加量が、0.03重量部（0.5Kg）
未満の場合は、掘削土の水分の吸収が十分でな
く、0.7重量部（９Kg）より多く添加しても添加
効果は少なく経済的でない。
高分子物質の好ましい添加量は、掘削土の種類
および含水率に基づいて、次のように決めること
ができる。
掘削土がシルト質土の場合
含水率20〜60％のシルト質土１Klに対して
0.5〜８Kg、
掘削土が砂質シルト土の場合
含水率20〜50％の砂質シルト土１Klに対して
0.5〜８Kg、
掘削土が粘土質シルト土の場合
含水率40〜70％の粘土質シルト土１Klに対し
て0.5〜８Kg、
掘削土が有機質土の場合
含水率15〜70％の有機質土１Klに対して、
0.5〜９Kg。
上記２価以上の陽イオンを含有する塩類として
は、周期律表ａ、ｂ、ａ、ｂ、ｂ、
ｂ、ｂ、ｂおよび族の陽イオンを含有する
水酸化物、塩化物、硫酸塩および硝酸塩のなかで
水溶性のものが好ましく、例えば、マグネシウ
ム、カルシウム、アルミニウムなどの水酸化物、
マグネシウム、カルシウム、バリウム、アルミニ
ウム、ジルコニウム、クロム、マンガンなどの塩
化物、硫酸塩または硝酸塩を用いることができ
る。
さらに、酸素化合物で陰イオン化する化合物、
例えばホウ酸塩、アルミン酸塩、クロム酸塩、そ
して過マンガン酸塩なども使用することができ
る。
これら２価以上の陽イオンを含有する塩類の添
加量は、掘削土100重量部（１Kl）に対して0.1〜
1.6重量部である。
塩類の添加量が、0.1重量部未満の場合は、凝
集効果が小さく、処理した掘削土の強度が小さ
く、1.6重量部より多い場合は、凝集効果が大き
く、遊離水が生じやすくなる。
上記水硬性セメントとしては、普通ポルトラン
ドセメント、速硬性ポルトランドセメント、高炉
セメント、その他の改良されたポルトランドセメ
ント、アルミナセメント、カルシウムセメント、
フライアツシユやポゾランを含有するセメント類
などを用いることができる。
水硬性セメントの使用量は掘削土100重量部
（１Kl）に対して0.6〜4.5重量部（10〜70Kg）、好
ましくは1.2〜2.8重量部（20〜40Kg）である。
水硬性セメントの使用量が0.6重量部（10Kg）
未満の場合は、掘削土を十分に固化させることが
できず、掘削土の強度が不足する。また、4.5重
量部（70Kg）より多い場合は、掘削土のPHが大き
くなり、掘削土の強度が大きくなりすぎ、再利用
や廃棄に適さない。
ｅ 作用
一般に、親水性の高い高分子物質は、その特性
として増粘効果、吸水効果、凝集効果などを有し
ている。
本発明においては、このような特性を有する高
分子物質を掘削土に添加混合することにより、掘
削土の増粘、凝集および脱水を行う。
すなわち、本発明において用いる天然水溶性高
分子物質、その半合成高分子物質、凝集性を有す
る合成水溶性高分子物質および吸水性樹脂は、水
溶性であり、増粘性、保水性および凝集性を有し
ている。
このような高分子物質の特定量を、チキソトロ
ピツク性を有し、含水率の高い掘削土に添加混合
すると、掘削土粒子にこれらの高分子物質は物理
的または化学的に吸着し、同時に粒子表面の電荷
が中和され、あるいは水分が吸収されて、掘削土
全体が凝集状態に保持される。
さらに、このような高分子物質と共に２価以上
の陽イオンを含有する塩類を特定量加えると、掘
削土の凝集状態をより効果的にかつ速やかに得る
ことができる。
すなわち、２価以上の陽イオンを含有する塩類
を加えることによつて、掘削土の凝集状態をより
良好にし、次に添加混合する少量の水硬性セメン
トの効果をより高めることができる。
この凝集状態にある掘削土に、水硬性セメント
を添加すると、水硬性セメントが掘削土や高分子
物質などと反応し、あるいは物理的吸着などを起
して、掘削土全体が凝集し、粉状化する。
したがつて、掘削土は適度の固さを持つた粉状
物になり、再利用するに適する形態、あるいは廃
棄が容易な形態の土壌になる。
このように、本発明方法によれば、掘削土は固
形分と液体分とを分離することなく短時間のうち
に効率良く固化されて、流動性がなくなり、一定
以上の強度を付与されて再利用に適する形態ある
いは廃棄が容易な形態になる。
ｆ 実施例
以下に、本発明を実施例によりさらに詳しく説
明する。
実施例 １
砂質シルトの掘削土に水を加え、一定の含水率
（23.1％、28.6％）に調整したのち、ポリビニル
メタアクリレートおよび硫酸第二鉄を添加混合
し、これにポルトランドセメントを加え、その混
合物の一軸圧縮強度の経時変化を測定した。
なお、ポリビニルメタアクリレート、硫酸第二
鉄およびポルトランドセメントの配合比は、水を
加えた掘削土100重量部に対して、表−１に示し
た量とした。
結果を表−１に示す。
a Industrial Application Field The present invention is applicable to drilling of oil wells, gas wells, geothermal wells, etc.
The present invention relates to a method for modifying excavated soil generated in tunnel construction, other civil engineering work, construction foundation work, etc. to make it suitable for reuse or easy to dispose of. b. Prior Art In general, excavated soil generated during excavation of oil wells, gas wells, geothermal wells, etc., civil engineering work, etc. usually has a moisture content of about 20 to 90%, although it varies depending on the region. Excavated soil containing such a large amount of water has conventionally been treated by mixing it with a cement-based solidifying agent. c. Problems to be Solved by the Invention However, the method for treating excavated soil using the above-mentioned cement-based solidifying agent requires that the excavated soil loses its fluidity after treatment and takes a long time (24 The drawback was that it took up to 48 hours. In addition, in order to give the excavated soil more strength than necessary after solidification, it is necessary to add a large amount of cement solidifying agent (usually 4 to 8% by weight), but it is necessary to add 4% by weight of cement solidifying agent. If more than % is added, the pH will increase to 12
As a result, there was a drawback that it was difficult to adjust the pH during the treatment process. The present invention has been made in view of the above-mentioned problems, and its purpose is to provide excavated soil that can be efficiently solidified so that it becomes a form suitable for reuse or a form that is easy to dispose of. The purpose of this invention is to provide a method for modifying. d Means for solving the problem The gist of the present invention is to solve the problem by:
0.03 to 0.7 parts by weight of at least one polymeric substance selected from natural water-soluble polymeric substances, semi-synthetic polymeric substances thereof, synthetic water-soluble polymeric substances with cohesive properties, and water-absorbing resins and 0.1 to 1.6 parts by weight of salts containing divalent or higher cations are added and mixed, and then 0.6 to 4.5 parts by weight of hydraulic cement are mixed. The excavated soil that can be modified by the present invention is generated during the excavation of oil wells, gas wells, geothermal wells, etc., or during tunnel construction and other civil engineering works, and varies depending on the region. Although it varies, it usually has a moisture content of about 20-90%. The moisture content of excavated soil that can be modified by the present invention is between 20 and 90%, preferably between 20 and 50%.
Therefore, it can be modified particularly effectively. In the excavated soil reforming method of the present invention, first,
At least one kind of polymeric substance selected from natural water-soluble polymeric substances, semi-synthetic polymeric substances thereof, synthetic water-soluble polymeric substances having cohesive properties, and water-absorbing resins is added and mixed to excavated soil. The natural water-soluble polymer substances or their semi-synthetic polymer substances include guar gum, locust bean gum, quince seed gum, arabinogalactan gum, gum arabic, gum tragacanth, starch, xanthan gum, xancort, gelatin, psyllium gum, alginates, Carboxymethyl cellulose, carboxymethyl hydroxyethyl cellulose, etc. can be used. Further, as the synthetic water-soluble polymer substance having cohesive properties, polyvinyl alcohol, polyvinylpyrrolidone, polyvinyl methacrylate, polyacrylamide, sodium polyacrylate, polyethylene oxide, vegum, etc. can be used. Further, as the water-absorbing resin, water-absorbing resins typified by polyacrylic acid-based, polysaccharite-based, or copolymer-based resins thereof, isobutylene, maleic anhydride copolymer-based resins, etc. can be used. These polymeric substances are water-soluble and have thickening, water-retaining, water-absorbing, and cohesive properties, and can be effectively used in the present invention. The amount of these polymeric substances added to excavated soil is
Although it varies depending on the type of excavated soil or moisture content, it is usually per 100 parts by weight (1 Kl) of excavated soil.
The amount is 0.03 to 0.7 parts by weight (0.5 to 9 kg). Added amount of polymeric substance is 0.03 parts by weight (0.5Kg)
If the amount is less than 0.7 parts by weight (9 kg), the excavated soil will not absorb enough water, and even if it is added in an amount greater than 0.7 parts by weight (9 kg), the effect of addition will be small and it will not be economical. The preferred amount of the polymeric substance added can be determined as follows based on the type and moisture content of excavated soil. If the excavated soil is silty soil, for 1 Kl of silty soil with a moisture content of 20 to 60%
0.5 to 8 Kg, if the excavated soil is sandy silt soil, per 1 Kl of sandy silt soil with a moisture content of 20 to 50%
0.5 to 8 kg, if the excavated soil is clay silt soil, 0.5 to 8 kg for 1 Kl of clay silt soil with a moisture content of 40 to 70%, and if the excavated soil is organic soil, to 1 Kl of organic soil with a moisture content of 15 to 70%. for,
0.5-9Kg. The salts containing divalent or higher cations include those of the periodic table a, b, a, b, b,
Among the hydroxides, chlorides, sulfates and nitrates containing cations of group b, b, b and group, water-soluble ones are preferred, such as hydroxides of magnesium, calcium, aluminum, etc.
Chlorides, sulfates or nitrates of magnesium, calcium, barium, aluminum, zirconium, chromium, manganese, etc. can be used. Furthermore, compounds that anionize with oxygen compounds,
For example, borates, aluminates, chromates, and permanganates can also be used. The amount of salts containing divalent or higher cations added is 0.1 to 100 parts by weight (1Kl) of excavated soil.
It is 1.6 parts by weight. If the amount of salts added is less than 0.1 part by weight, the flocculating effect is small and the strength of the treated excavated soil is low, and if it is more than 1.6 parts by weight, the flocculating effect is large and free water is likely to be generated. The above-mentioned hydraulic cements include ordinary Portland cement, fast-setting Portland cement, blast furnace cement, other improved Portland cements, alumina cement, calcium cement,
Cement containing fly ash or pozzolan can be used. The amount of hydraulic cement used is 0.6 to 4.5 parts by weight (10 to 70 kg), preferably 1.2 to 2.8 parts by weight (20 to 40 kg) per 100 parts by weight (1 Kl) of excavated soil. The amount of hydraulic cement used is 0.6 parts by weight (10Kg)
If it is less than 20%, the excavated soil cannot be solidified sufficiently and the strength of the excavated soil is insufficient. If the amount is more than 4.5 parts by weight (70 kg), the PH of the excavated soil will increase and the strength of the excavated soil will become too large, making it unsuitable for reuse or disposal. e Effect Generally, highly hydrophilic polymeric substances have properties such as thickening effect, water absorption effect, and coagulation effect. In the present invention, the excavated soil is thickened, coagulated, and dehydrated by adding and mixing a polymeric substance having such characteristics to the excavated soil. That is, the natural water-soluble polymer substances, semi-synthetic polymer substances thereof, synthetic water-soluble polymer substances having cohesive properties, and water-absorbing resins used in the present invention are water-soluble and have low viscosity, water retention, and cohesive properties. have. When a specific amount of such polymeric substances is added and mixed with excavated soil that has thixotropic properties and a high moisture content, these polymeric substances are physically or chemically adsorbed to the excavated soil particles, and at the same time the particle surface The electric charge is neutralized or water is absorbed, and the entire excavated soil is held in a cohesive state. Furthermore, by adding a specific amount of salts containing divalent or higher cations together with such polymeric substances, the agglomerated state of excavated soil can be obtained more effectively and quickly. That is, by adding salts containing divalent or higher cations, it is possible to improve the cohesive state of the excavated soil and further enhance the effect of the small amount of hydraulic cement that is then added and mixed. When hydraulic cement is added to this aggregated excavated soil, the hydraulic cement reacts with the excavated soil and polymeric substances, or causes physical adsorption, causing the entire excavated soil to aggregate and become powdery. become Therefore, the excavated soil becomes a powder with appropriate hardness, and becomes soil in a form suitable for reuse or easy to dispose of. As described above, according to the method of the present invention, the excavated soil is efficiently solidified in a short time without separating the solid content and the liquid content, loses its fluidity, and is given a certain level of strength and can be reused. It becomes a form suitable for use or a form that is easy to dispose of. f Examples Hereinafter, the present invention will be explained in more detail using examples. Example 1 After adding water to sandy silt excavated soil and adjusting it to a certain moisture content (23.1%, 28.6%), polyvinyl methacrylate and ferric sulfate were added and mixed, and Portland cement was added to this. Changes in unconfined compressive strength of the mixture over time were measured. The blending ratios of polyvinyl methacrylate, ferric sulfate, and Portland cement were as shown in Table 1, based on 100 parts by weight of excavated soil with water added. The results are shown in Table-1.
【表】
実施例 ２
シルト質の掘削土に水を加え、一定の含水率
（41.2％、47.4％）に調整したのち、ザンサンガ
ムおよび塩化カルシウムを添加混合し、これに高
炉セメントを加え、その混合物の一軸圧縮強度の
経時変化を測定した。
なお、ザンサンガム、塩化カルシウムおよび高
炉セメントの配合比は、水を加えた掘削土100重
量部に対して、表−２に示した量とした。
結果を表−２に示す。[Table] Example 2 Water was added to silty excavated soil to adjust the moisture content to a certain level (41.2%, 47.4%), then xanthan gum and calcium chloride were added and mixed, blast furnace cement was added to this, and the mixture was mixed. The change in unconfined compressive strength over time was measured. The mixing ratios of xanthan gum, calcium chloride, and blast furnace cement were as shown in Table 2 with respect to 100 parts by weight of excavated soil with water added. The results are shown in Table-2.
【表】【table】
【表】
実施例 ３
シルト質の掘削土に水を加えて、一定の含水率
（41.2％、47.4％）に調整したのち、グアーガム
および硫酸アルミニウムを添加混合し、これにア
ルミナセメントを加え、その混合物の一軸圧縮強
度の経時変化を測定した。
なお、グアーガム、硫酸アルミニウムおよびア
ルミナセメントの配合比は、水を加えた掘削土
100重量部に対して、表−３に示した量とした。
結果を表−３に示す。[Table] Example 3 Water was added to silty excavated soil to adjust the moisture content to a certain level (41.2%, 47.4%), then guar gum and aluminum sulfate were added and mixed, and alumina cement was added to this. Changes in unconfined compressive strength of the mixture over time were measured. The mixing ratio of guar gum, aluminum sulfate, and alumina cement is based on the excavated soil with water added.
The amounts shown in Table 3 were used for 100 parts by weight. The results are shown in Table-3.
【表】
表−１〜表−３に示す結果から、掘削土に対す
る高分子物質、２価以上の陽イオンを含有する塩
類、および水硬性セメントの好ましい添加量が判
る。
比較例 １
シルト質の掘削土に水を加え、一定の含水率
（41.2％、47.4％）に調整したのち、グアーガム
を加え混合し、さらにポルトランドセメントを加
えた場合と、グアーガムのみを加えた場合の、一
軸圧縮強度の経時変化を測定した。
グアーガムおよびポルトランドセメントの配合
比は、水を加えた掘削土100重量部に対して、表
−４に示した量とした。
結果を表−４に示す。[Table] From the results shown in Tables 1 to 3, preferred amounts of polymeric substances, salts containing divalent or higher cations, and hydraulic cement to be added to excavated soil can be determined. Comparative Example 1 Water was added to silty excavated soil to adjust the moisture content to a certain level (41.2%, 47.4%), then guar gum was added and mixed, then Portland cement was added, and guar gum alone was added. The change in unconfined compressive strength over time was measured. The mixing ratio of guar gum and Portland cement was as shown in Table 4, based on 100 parts by weight of excavated soil with water added. The results are shown in Table 4.
【表】
比較例 ２
砂質シルトの掘削土に水を加え、一定の含水率
（33.3％、37.5％）に調整したのち、ポリビニル
メタアクリレートを加え混合し、さらにポルトラ
ンドセメントを加えた場合と、ポリビニルメタア
クリレートのみを加えた場合の、一軸圧縮強度の
経時変化を測定した。
ポリビニルメタアクリレートおよびポルトラン
ドセメントの配合比は、水を加えた掘削土100重
量部に対して、表−５に示した量とした。
結果を表−５に示す。[Table] Comparative Example 2 After adding water to sandy silt excavated soil and adjusting it to a certain moisture content (33.3%, 37.5%), polyvinyl methacrylate was added and mixed, and then Portland cement was added. Changes in unconfined compressive strength over time were measured when only polyvinyl methacrylate was added. The blending ratio of polyvinyl methacrylate and Portland cement was as shown in Table 5 with respect to 100 parts by weight of excavated soil with water added. The results are shown in Table-5.
【表】【table】
【表】
比較例 ３
シルト質の掘削土に水を加え、一定の含水率
（41.2％、47.4％）に調整したのち、ポリサツカ
ライド系吸水樹脂を加え混合し、さらにアルミナ
セメントを加えた場合と、ポリサツカライド系吸
水樹脂のみを加えた場合の、一軸圧縮強度の経時
変化を測定した。
なお、ポリサツカライド系吸水樹脂およびアル
ミナセメントの配合比は、水を加えた掘削土100
重量部に対して表−６に示した量とした。
結果を表−６に示す。[Table] Comparative Example 3 When water is added to silty excavated soil to adjust the water content to a certain level (41.2%, 47.4%), polysaccharide-based water-absorbing resin is added and mixed, and alumina cement is further added. The change in unconfined compressive strength over time was measured when only the polysaccharide-based water-absorbing resin was added. The blending ratio of polysaccharide water-absorbing resin and alumina cement is 100% of excavated soil with water added.
The amounts shown in Table 6 were determined based on parts by weight. The results are shown in Table-6.
【表】
比較例 ４
ポリビニルメタアクリレート、硫酸第二鉄およ
びポルトランドセメントを同時に加える以外は、
実施例１と同様にして得た混合物の一軸圧縮強度
の経時変化を測定した。
結果を表−７に示す。[Table] Comparative Example 4 Except for adding polyvinyl methacrylate, ferric sulfate and Portland cement at the same time,
The change over time in the unconfined compressive strength of the mixture obtained in the same manner as in Example 1 was measured. The results are shown in Table-7.
【表】
実施例１〜３と比較例１〜３の対比から、掘削
土に対して、高分子物質、２価以上の陽イオンを
含有する塩類および水硬性セメントの３成分を混
合することにより、高分子物質と水硬性セメント
を混合する場合よりも、さらに優れた効果が得ら
ることがわかる。
また、実施例１と比較例４の対比から、掘削土
に対して、高分子物質と２価以上の陽イオンを含
有する塩類を添加混合したのち、水硬性セメント
を混合することにより、高分子物質、２価の陽イ
オンを含有する塩類および水硬性セメントを同時
に添加混合するよりも、さらに優れた効果が得ら
れることが判る。
ｇ 発明の効果
本発明によれば、石油井、ガス井および地熱井
の掘削、トンネル工事その他の土木工事で発生す
る掘削土を、固形分と液体とを分離することなく
短時間のうちに効率よく固化させて、流動性をな
くし、一定以上の強度を付与することができ、掘
削土を再利用に適し、また廃棄が容易になるよう
に改質することができる。[Table] Comparison of Examples 1 to 3 and Comparative Examples 1 to 3 shows that by mixing the three components of a polymer substance, salts containing divalent or higher cations, and hydraulic cement into excavated soil, , it can be seen that even better effects can be obtained than when a polymeric substance and hydraulic cement are mixed. In addition, from a comparison between Example 1 and Comparative Example 4, it was found that by adding and mixing a polymer substance and salts containing divalent or higher cations to excavated soil, and then mixing hydraulic cement, polymer It can be seen that even better effects can be obtained than when the substance, salts containing divalent cations, and hydraulic cement are added and mixed at the same time. g. Effects of the Invention According to the present invention, excavated soil generated during oil, gas, and geothermal well drilling, tunnel construction, and other civil engineering works can be efficiently processed in a short time without separating solid content and liquid. It can solidify well, eliminate fluidity, and impart strength above a certain level, making it suitable for reusing excavated soil and modifying it so that it can be easily disposed of.
Claims (1)
天然水溶性高分子物質、その半合成高分子物質、
凝集性を有する合成水溶性高分子物質および吸水
性樹脂から選ばれた少なくとも１種の高分子物質
0.03〜0.7重量部と２価以上の陽イオンを含有す
る塩類0.1〜1.6重量部を添加混合し、次いで、水
硬性セメント0.6〜4.5重量部を混合せしめること
を特徴とする掘削土の改質方法。 ２ 上記塩類が、２価以上の陽イオンを含有する
水酸化物、塩化物、硫酸塩および硝酸塩から選ば
れた少なくとも１種の化合物である特許請求の範
囲第１項記載の掘削土の改質方法。 ３ 上記２価以上の陽イオンが、周期律表ａ、
ｂ、ａ、ｂ、ｂ、ｂ、ｂ、ｂまた
は族の陽イオンである特許請求の範囲第１項ま
たは第２項記載の掘削土の改質方法。 ４ 上記水硬性セメントが、ポルトランド系セメ
ント、アルミナ系セメント、特殊セメント、また
はこれらとフライアツシユ、ポゾランなどを含有
したものである特許請求の範囲第１項〜第３項の
いずれか１項に記載の掘削土の改質方法。[Claims] 1. For 100 parts by weight of excavated soil produced during excavation,
Natural water-soluble polymer substances, semi-synthetic polymer substances,
At least one polymeric substance selected from synthetic water-soluble polymeric substances and water-absorbing resins having cohesive properties
A method for improving excavated soil, which comprises adding and mixing 0.03 to 0.7 parts by weight and 0.1 to 1.6 parts by weight of salts containing divalent or higher cations, and then mixing 0.6 to 4.5 parts by weight of hydraulic cement. . 2. Modification of excavated soil according to claim 1, wherein the salts are at least one compound selected from hydroxides, chlorides, sulfates, and nitrates containing divalent or higher cations. Method. 3 The above divalent or higher cations are those of periodic table a,
The method for modifying excavated soil according to claim 1 or 2, wherein the cation is a cation of group b, a, b, b, b, b, b or group. 4. According to any one of claims 1 to 3, the hydraulic cement is a Portland cement, an alumina cement, a special cement, or a cement containing these together with fly ash, pozzolan, etc. method for improving excavated soil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20750687A JPS6451198A (en) | 1987-08-21 | 1987-08-21 | Modifying method for drilling soil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20750687A JPS6451198A (en) | 1987-08-21 | 1987-08-21 | Modifying method for drilling soil |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6451198A JPS6451198A (en) | 1989-02-27 |
| JPH0415038B2 true JPH0415038B2 (en) | 1992-03-16 |
Family
ID=16540848
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20750687A Granted JPS6451198A (en) | 1987-08-21 | 1987-08-21 | Modifying method for drilling soil |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6451198A (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5352432A (en) * | 1986-07-03 | 1994-10-04 | Advanced Magnetics, Inc. | Hepatocyte specific composition and their use as diagnostic imaging agents |
| US5554386A (en) * | 1986-07-03 | 1996-09-10 | Advanced Magnetics, Inc. | Delivery of therapeutic agents to receptors using polysaccharides |
| US5679323A (en) * | 1986-07-03 | 1997-10-21 | Advanced Magnetics, Inc. | Hepatocyte-specific receptor-mediated endocytosis-type compositions |
| JPH0691999B2 (en) * | 1989-01-24 | 1994-11-16 | ハイモ株式会社 | Treatment method for wet excavated soil |
| JP2836346B2 (en) * | 1992-03-03 | 1998-12-14 | 株式会社大林組 | Method for generating improved soil and apparatus for generating improved soil |
| JP2000220377A (en) * | 1999-02-02 | 2000-08-08 | Penta Ocean Constr Co Ltd | Method for reusing discharged soil in high density slurry shield work |
| CN110194577A (en) * | 2019-05-13 | 2019-09-03 | 深圳申佳原环保科技有限公司 | A kind of shield slurry curing agent and its preparation method and application method |
| CN112551987B (en) * | 2020-12-22 | 2022-09-02 | 苏交科集团股份有限公司 | Preparation method for quickly recycling over-wet soft soil into light filling soil |
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|---|---|---|---|---|
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Also Published As
| Publication number | Publication date |
|---|---|
| JPS6451198A (en) | 1989-02-27 |
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