JPH0593416A - Device for providing shearing wave for ground and measuring method of liquefaction strength - Google Patents

Device for providing shearing wave for ground and measuring method of liquefaction strength

Info

Publication number
JPH0593416A
JPH0593416A JP16511891A JP16511891A JPH0593416A JP H0593416 A JPH0593416 A JP H0593416A JP 16511891 A JP16511891 A JP 16511891A JP 16511891 A JP16511891 A JP 16511891A JP H0593416 A JPH0593416 A JP H0593416A
Authority
JP
Japan
Prior art keywords
ground
shear wave
weight
shearing
water pressure
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.)
Pending
Application number
JP16511891A
Other languages
Japanese (ja)
Inventor
Atsushi Namiki
Taro Shirai
Masanori Taketomi
厚 並木
正憲 武富
太郎 白井
Original Assignee
Takeru Gijutsu Consultant:Kk
株式会社タケル技術コンサルタント
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Takeru Gijutsu Consultant:Kk, 株式会社タケル技術コンサルタント filed Critical Takeru Gijutsu Consultant:Kk
Priority to JP16511891A priority Critical patent/JPH0593416A/en
Publication of JPH0593416A publication Critical patent/JPH0593416A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To measure comparatively easily and accurately liquefaction strength of the ground by transferring shearing waves generated by the reciprocation of a weight to the ground, and measuring interstitial water pressure varied by the shearing waves. CONSTITUTION:A weight 14 housed in a container 11 is reciprocated by an electromagnet 17, and a shearing wave generating section 2 to generate shearing waves by making the collision of the weight 14 with stoppers 12 and 13 is provided. After that, anchoring means 3 and 3 consisting of a pair of opposed bearing plates 30, 31 and strut means 32, 32 bridged between the bearing plates and capable of varying the interval are provide. Then, the shearing wave generating section 2 is fixed to the inside of a hole bored in the ground with the anchoring means 3. Shearing waves generated by the shearing wave generating section 2 are transferred to the ground through the anchoring means 3. Interstitial water pressure varied by the shearing waves propagated in the ground is measured by an interstitial water gauge installed at a certain distance from a shearing wave generator 1 to measure liquefaction strength of the ground.

Description

【発明の詳細な説明】Detailed Description of the Invention
【0001】[0001]
【産業上の利用分野】本発明は、剪断波を地盤に与える
装置に関し、さらに詳しくは、地盤に開けたボーリング
孔内で剪断波を繰り返し発生させ、この剪断波を地盤に
伝播させて、地盤に液状化状態を発生させることができ
る装置に関する。さらに本発明は、この装置を用いて剪
断波を与えた地盤の間隙水圧を測定することにより地盤
の液状化強度を現位置で測定することができる方法に関
する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for applying a shear wave to the ground. More specifically, the shear wave is repeatedly generated in a boring hole formed in the ground, and the shear wave is propagated to the ground. The present invention relates to a device capable of generating a liquefied state. Further, the present invention relates to a method capable of measuring the liquefaction strength of the ground at the present position by measuring the pore water pressure of the ground to which a shear wave is applied using this device.
【0002】[0002]
【従来の技術】地盤の液状化の強度を予想し、これに基
ずいて、耐震性に優れた構造物を建設することは、地震
の多い我が国においては、極めて重要なことである。
2. Description of the Related Art Predicting the strength of ground liquefaction and constructing a structure having excellent earthquake resistance based on this is extremely important in Japan where there are many earthquakes.
【0003】従来の地盤の液状化の強度の評価法には、
大きく別けて2種類あり、現位置試験法と室内試験法が
ある。現位置試験法には、標準貫入試験法、杭の振動
(サンドコンパクションパイル)を利用する方法、発破
による方法及びピエゾメータープローブを用いる方法等
がある。
The conventional methods for evaluating the strength of liquefaction of the ground are:
There are roughly two types, the current position test method and the indoor test method. The in-situ test method includes a standard penetration test method, a method using vibration of a pile (sand compaction pile), a method by blasting and a method using a piezometer probe.
【0004】具体的には、標準貫入試験法は、実際の地
震で液状化した地点及び液状化しなかった地点におい
て、標準貫入試験により求めたN値を比較するか、また
は室内試験で得られる液状化強度とN値を対応させるこ
とにより、液状化予想を行う方法である。杭の振動を利
用する方法は、サンドコンパクションパイルの施工時や
杭の振動打込時に、その周辺の地盤に生じる加速度と間
隙水圧とを測定し、その結果から、液状化のし易さを求
める方法である。発破による方法は、地中で火薬を爆破
させ、発破点から一定距離の円周上における地盤の平均
沈下量および過剰間隙水圧を測定し、その結果から液状
化のし易さを求める方法である。ピエゾメータープロー
ブを用いる方法は、ピエゾメータープローブによって求
められる貫入抵抗と静的な過剰間隙水圧の関係から、液
状化のし易さを求める方法である。
[0004] Specifically, the standard penetration test method is to compare the N values obtained by the standard penetration test at a liquefied point and an unliquefied point in an actual earthquake or to obtain a liquid obtained by an indoor test. This is a method of predicting liquefaction by associating the liquefaction strength with the N value. The method of utilizing the vibration of the pile is to measure the acceleration and pore water pressure that occur in the ground around it when constructing a sand compaction pile or when driving the pile into vibration, and determine the ease of liquefaction from the results. Is the way. The blast method is a method of exploding explosives in the ground, measuring the average subsidence amount and excess pore water pressure of the ground on the circumference of a certain distance from the blast point, and determining the ease of liquefaction from the results. .. The method using a piezometer probe is a method for determining the ease of liquefaction based on the relationship between the penetration resistance and the static excess pore water pressure required by the piezometer probe.
【0005】[0005]
【発明が解決しようとする課題】標準貫入試験法及びピ
エゾメータープローブを用いる方法は、比較的容易に行
うことができる。しかし、これらの方法は、直接、地盤
の液状化強度を測定するものではなく、これら試験法か
ら得られた結果から、経験により間接的に液状化強度を
求めるものであって、信頼性に疑問もある。その点、杭
の振動を利用する方法及び発破による方法は、直接液状
化強度を求めることができる。しかし、これらの方法
は、実験の規模が大きくなり、実施に際しては多大のコ
ストがかかるという問題がある。
The standard penetration test method and the method using a piezometer probe are relatively easy to carry out. However, these methods do not directly measure the liquefaction strength of the ground, but indirectly obtain the liquefaction strength by experience from the results obtained from these test methods, and doubt the reliability. There is also. In this respect, the liquefaction strength can be directly obtained by the method using vibration of the pile and the method by blasting. However, these methods have a problem that the scale of the experiment becomes large and that the cost is large when the method is performed.
【0006】一方、室内試験法は、現場から地盤の不攪
乱試料を採取し、この試料に対してて試験室において繰
り返し三軸試験を行うものである。従って、不攪乱試料
さえ入手できれば、より正確な液状化強度の算出が可能
である。しかし、実際には不攪乱試料を採取することが
必ずしも容易ではなく、また、攪乱された試料では実際
の液状化強度を求めることはできない。
On the other hand, in the laboratory test method, an undisturbed sample of the ground is sampled from the site, and this sample is repeatedly subjected to a triaxial test in a test room. Therefore, more accurate calculation of liquefaction strength is possible if only undisturbed samples are available. However, actually, it is not always easy to collect an undisturbed sample, and the actual liquefaction strength cannot be obtained from the disturbed sample.
【0007】そこで、本発明の目的は、現位置で比較的
容易にかつより正確に液状化強度を測定するために必要
な、地盤に剪断波を与えることができる簡易型の装置を
提供することにある。
[0007] Therefore, an object of the present invention is to provide a simple type device capable of giving a shear wave to the ground, which is necessary for measuring the liquefaction strength relatively easily and more accurately at the present position. It is in.
【0008】さらに、本発明の目的は、上記装置を用い
て、現位置で比較的容易にかつより正確に液状化強度を
測定できる方法を提供することにある。
Further, it is an object of the present invention to provide a method capable of relatively easily and more accurately measuring the liquefaction strength at the present position by using the above apparatus.
【0009】[0009]
【課題を解決するための手段】本発明は、剪断波発生部
及び該剪断波発生部を地盤に開けた孔内に固定し、かつ
該剪断波発生部で発生させた剪断波を地盤に伝える固定
手段からなる、剪断波を地盤に与える装置(以下、剪断
波発生装置という)であって、前記剪断波発生部は、往
復動し、ストッパーに衝突することにより剪断波を発生
させる錘、該錘を往復動させる駆動手段、並びに前記錘
及び駆動手段を収納し、内部に前記ストッパーを設け、
かつ前記錘の往復動により発生した剪断波を地盤孔の内
壁に伝えるための容器とからなり、前記固定手段は、対
向する一対の支持板及び該支持板の間を架橋し、かつ該
支持板の間隔を変動させることが可能な少なくとも2つ
の支柱手段とからなり、前記支持板のいずれか一方に前
記剪断波発生部の容器が固定されていることを特徴とす
る前記装置に関する。
According to the present invention, a shear wave generator and a shear wave generator are fixed in a hole opened in the ground, and the shear wave generated in the shear wave generator is transmitted to the ground. An apparatus for applying a shear wave to the ground (hereinafter referred to as a shear wave generating apparatus), which comprises a fixing means, wherein the shear wave generating section reciprocates, and a weight that generates a shear wave by colliding with a stopper, A drive means for reciprocating the weight, and the weight and the drive means are housed, and the stopper is provided inside.
And a container for transmitting a shear wave generated by the reciprocating motion of the weight to the inner wall of the ground hole, the fixing means bridges between a pair of opposing support plates and the space between the support plates. The present invention relates to the above-mentioned device, characterized in that it comprises at least two support means capable of varying the above, and the container of the shear wave generating section is fixed to one of the support plates.
【0010】さらに本発明は、地盤に開けた孔内に設置
した上記剪断波発生装置から地盤に剪断波を繰り返し与
え、地盤内を伝播した剪断波により変化する間隙水圧
を、前記孔と同一の孔内に上記装置から一定距離に設置
した間隙水圧計により測定することを特徴とする地盤の
液状化強度の測定方法に関する。
Further, according to the present invention, a shear wave is repeatedly applied to the ground from the shear wave generator installed in the hole opened in the ground, and the pore water pressure changing by the shear wave propagating in the ground is the same as that of the hole. The present invention relates to a method for measuring the liquefaction strength of the ground, which is measured by a pore water pressure gauge installed in the hole at a constant distance from the device.
【0011】以下本発明について詳細に説明する。The present invention will be described in detail below.
【0012】本発明の1態様である剪断波発生装置1
は、図1に示すように、剪断波発生部2及び該剪断波発
生部2を地盤に開けた孔内に固定し、かつ該剪断波発生
部2で発生させた剪断波を地盤に伝える固定手段3から
なる。尚、図中4は剪断波発生部2の電源であり、5は
固定手段3を稼働させるための源である。
Shear wave generator 1 according to one embodiment of the present invention
As shown in FIG. 1, the shear wave generator 2 and the shear wave generator 2 are fixed in a hole opened in the ground, and the shear wave generated in the shear wave generator 2 is fixed to the ground. It consists of means 3. In the figure, 4 is a power source for the shear wave generator 2, and 5 is a source for operating the fixing means 3.
【0013】剪断波発生部1は、図1のA−A’拡大部
分断面図である図2に示すように、内部が中空の容器1
1からなり、該容器11の内部は、2つのストッパー1
2及び13で3分割されている。錘14は、上下面に上
下方向に延在させた2本の軸15を有する。ストッパー
12及び13の中心部には、この軸15が貫通できる大
きさの孔16がある。ストッパー12及び13の間の部
屋の長さは、錘14が上下動できるように、錘14の長
さより大きく、錘14は、ストッパー12及び13の孔
16を軸15が貫通するように、ストッパー12及び1
3の間の部屋にセットさる。
As shown in FIG. 2, which is an enlarged partial sectional view taken along the line AA 'of FIG. 1, the shear wave generating section 1 has a hollow interior 1
The inside of the container 11 consists of two stoppers 1.
It is divided into 3 by 2 and 13. The weight 14 has two shafts 15 extending in the vertical direction on the upper and lower surfaces. At the center of the stoppers 12 and 13, there is a hole 16 large enough for the shaft 15 to pass through. The length of the chamber between the stoppers 12 and 13 is larger than the length of the weight 14 so that the weight 14 can move up and down, and the weight 14 has a stopper so that the shaft 15 penetrates the holes 16 of the stoppers 12 and 13. 12 and 1
Set in the room between 3.
【0014】容器11のストッパー12及び13で仕切
られた端の部屋の少なくとも一方に、錘14を往復動さ
せる駆動手段として電磁石17を収納する。これは、電
磁プランジャーの原理を利用して、電磁石17で、錘1
4の上下面に上下方向に延在させた軸15に磁力を加え
ることで、錘14を往復動させる。上下に往復動する錘
14を、ストッパー12及び13に衝突させることによ
り剪断波を発生させる。容器11は、錘14が往復動し
てストッパー12及び13に衝突するとこにより発生し
た剪断波を後述の支持板30に伝える。
An electromagnet 17 is housed in at least one of the chambers at the ends of the container 11 partitioned by the stoppers 12 and 13 as a driving means for reciprocating the weight 14. This uses the principle of an electromagnetic plunger, and the weight 1
The weight 14 is reciprocated by applying a magnetic force to the shaft 15 extending in the vertical direction on the upper and lower surfaces of 4. A shear wave is generated by colliding the weight 14 that reciprocates up and down with the stoppers 12 and 13. The container 11 transmits a shear wave generated when the weight 14 reciprocates and collides with the stoppers 12 and 13 to a support plate 30 described later.
【0015】本発明の剪断波発生装置の別の態様を図3
に示す。さらに、剪断波発生部1を図3のB−B’拡大
部分断面図である図4及び図4のC−C’断面図である
図5を用いて説明する。
Another embodiment of the shear wave generator of the present invention is shown in FIG.
Shown in. Further, the shear wave generator 1 will be described with reference to FIG. 4 which is an enlarged partial sectional view taken along the line BB ′ of FIG. 3 and FIG. 5 which is a sectional view taken along the line CC ′ of FIG.
【0016】容器18は内部が中空であり、上壁には、
後述の錘19を回転動させる駆動手段であるモーター2
0が埋め込まれ、下壁の内側中心部には錘19の軸21
を支持する軸受22が有る。容器18の内部には、回転
往復動する円板状の錘19がこの錘19を回転動させる
駆動手段であるモーター20と錘19の上下面の中心に
設けた2本の軸21の一方を介して連結され、軸21の
他方は軸受22に支持されている。錘19は上面又は下
面の円周付近に突起23を有する。また容器18の内面
には、突起23と衝突するようにストッパー24が設け
られる。ストッパー24は、1つ又は2つ設けることが
できる。錘19が回転することにより突起23がストッ
パー24に衝突して剪断波を発生する。この剪断波は、
ストッパー24から容器18と一体に成形された支持板
30を介して地盤に伝えられる。
The container 18 has a hollow interior, and the upper wall is
A motor 2 which is a driving means for rotating a weight 19 described later.
0 is embedded, and the shaft 21 of the weight 19 is attached to the inner center of the lower wall.
There is a bearing 22 that supports. Inside the container 18, a disk-shaped weight 19 that reciprocally rotates is provided with a motor 20 that is a driving means for rotating the weight 19 and one of two shafts 21 provided at the centers of the upper and lower surfaces of the weight 19. The other end of the shaft 21 is supported by a bearing 22. The weight 19 has a protrusion 23 near the circumference of the upper surface or the lower surface. A stopper 24 is provided on the inner surface of the container 18 so as to collide with the protrusion 23. One or two stoppers 24 can be provided. When the weight 19 rotates, the projection 23 collides with the stopper 24 and a shear wave is generated. This shear wave
It is transmitted from the stopper 24 to the ground through a support plate 30 formed integrally with the container 18.
【0017】一方、固定手段2は、対向する一対の支持
板30と支持板31の間を架橋し、かつ該支持板30及
び31の間隔を自由に変動させることが可能な少なくと
も2つの支柱手段32とからなる。そして、支持板30
又は31のいずれか一方に前記剪断波発生部1の容器1
1または18が固定される。支柱手段32としては、公
知の油圧ポンプや空気圧ポンプ式のジャッキ等を用いる
ことができる。また、容器11または18とこの容器1
1または18を固定した支持板30又は31とは、一体
に成形したものでも、両者を接着したものであってもよ
い。
On the other hand, the fixing means 2 bridges between a pair of support plates 30 and 31 facing each other, and at least two support means which can freely change the distance between the support plates 30 and 31. And 32. And the support plate 30
Alternatively, the container 1 of the shear wave generator 1 is provided on either one of
1 or 18 is fixed. As the support means 32, a known hydraulic pump, a pneumatic pump type jack, or the like can be used. Also, the container 11 or 18 and this container 1
The support plate 30 or 31 to which 1 or 18 is fixed may be integrally molded or may be bonded together.
【0018】本発明の液状化強度の測定方法は、上記の
剪断波発生装置を用いて地盤の孔内で地盤に剪断波を繰
り返し与え、それにより変化する地盤内の間隙水圧を、
同様に地盤の孔内に設置した間隙水圧計により測定する
ことにより求められる。この方法を図6に従って説明す
る。
The method for measuring the liquefaction strength of the present invention uses the above shear wave generator to repeatedly apply a shear wave to the ground in a hole in the ground, thereby changing the pore water pressure in the ground,
Similarly, it can be obtained by measuring with a pore pressure gauge installed in the hole in the ground. This method will be described with reference to FIG.
【0019】剪断波発生装置1及び間隙水圧計6、さら
に必要により加速度計7を地盤10に開けた孔9内に設
置する。剪断波発生装置1と間隙水圧計6及び加速度計
7とは一定の距離を置いて設置する。次いで、剪断波発
生装置1を用いて地盤10に剪断波を繰り返し与え、地
盤内を伝播した剪断波により変化する間隙水圧を間隙水
圧計6により測定する。また、同時に加速度計7によ
り、剪断波による加速度を求める。但し、加速度は同時
に測定する必要はなく、予め測定しておくこともでき
る。
The shear wave generator 1, the pore water pressure gauge 6, and, if necessary, the accelerometer 7 are installed in the hole 9 formed in the ground 10. The shear wave generator 1 and the pore water pressure gauge 6 and the accelerometer 7 are installed with a certain distance. Then, a shear wave is repeatedly applied to the ground 10 using the shear wave generator 1, and the pore water pressure gauge 6 measures the pore water pressure that changes due to the shear wave propagating in the ground. At the same time, the acceleration due to the shear wave is obtained by the accelerometer 7. However, the acceleration does not have to be measured at the same time, and may be measured in advance.
【0020】このようにして測定した間隙水圧の変化か
ら、累積損傷度法を用いて、以下のようにして地盤の液
状化強度を求める。用いるパラメーターは以下の通りで
ある。 τ0 :剪断波発生装置1から発生する剪断応力 τd :間隙水圧測定位置の剪断応力 x :測定された加速度 Δu:測定された過剰間隙水圧 L :剪断波発生装置1と間隙水圧計6との距離
From the change in pore water pressure measured in this way, the liquefaction strength of the ground is obtained as follows using the cumulative damage degree method. The parameters used are as follows. τ 0 : Shear stress generated from shear wave generator 1 τ d : Shear stress at pore water pressure measurement position x: Measured acceleration Δu: Measured excess pore water pressure L: Shear wave generator 1 and pore water pressure gauge 6 The distance
【0021】1.過剰間隙水圧Δu及び加速度xを測定
する。 2.剪断波発生装置1の錘の質量、剪断波発生部2を固
定する支持板30の面積、錘14又は19の駆動のため
に与えた電流から、剪断波発生装置1から発生する剪断
応力τ01を求める。 3.2で求めた剪断応力τ01、予め決めてあるL及び1
で測定したxから、間隙水圧測定位置での剪断応力τd1
を求める。 4.1波の剪断波による応力τd と過剰間隙水圧の変化
量Δuとは、図7に示すような関係があるので、3で求
めたτd1と1で測定したΔu1 との関係を同様にして求
め、τd11波当たりのΔu1 を求める。
1. Excessive pore water pressure Δu and acceleration x are measured. 2. From the mass of the weight of the shear wave generator 1, the area of the support plate 30 that fixes the shear wave generator 2, and the electric current applied to drive the weight 14 or 19, the shear stress τ 01 generated from the shear wave generator 1 is generated. Ask for. Shear stress τ 01 determined in 3.2, L and 1 determined in advance
Shear stress τ d1 at the pore water pressure measurement position from x measured in
Ask for. Since the stress τ d due to the shear wave of 4.1 waves and the change amount Δu of the excess pore water pressure have the relationship shown in FIG. 7, the relationship between τ d1 obtained in 3 and Δu 1 measured in 1 is Similarly, Δu 1 per τ d1 wave is calculated.
【0022】5.τd11波当たりの累積損傷度をDn=1
td1 =Δu1 /δv'とする。但し、δv'は間隙水圧測定
地点の有効応力である。 6.τ0 を変化させて、1〜4の操作を繰り返し行い、
τ02、τ03における過剰間隙水圧Δu2 、Δu3 及び加
速度x2 、x3 を測定し、同様にしてDn=1 td2 =Δu
2 /δv'及びDn=1 td3 =Δu3 /δv'を求める。これ
らから、液状化に必要な繰り返し回数(N値)N=δv'
/Δu123 を求める。 7.応力比RL =τd123/δv'を縦軸にし、6で求めた
N=δv'/Δu123 を横軸にして図8に示すような関係
を求め、この結果から地盤の液状化強度を求めることが
できる。
5. τ d1 Cumulative damage per wave D n = 1
td1 = and Δu 1 / δv '. However, δv 'is the effective stress at the pore water pressure measurement point. 6. Change τ 0 and repeat steps 1 to 4,
Excess pore water pressures Δu 2 , Δu 3 and accelerations x 2 , x 3 at τ 02 , τ 03 were measured, and D n = 1 td2 = Δu in the same manner.
2 / δv 'and D n = 1 td3 = Δu 3 / δv' are obtained. From these, the number of repetitions (N value) required for liquefaction N = δv '
Calculate / Δu 123 . 7. The stress ratio R L = τ d123 / δv 'is plotted on the ordinate and the N = δv' / Δu 123 obtained on 6 is plotted on the abscissa, and the relationship as shown in FIG. 8 is obtained. You can ask.
【0023】[0023]
【発明の効果】本発明の剪断波発生装置を用いれば、現
位置で比較的容易にかつより正確に液状化強度を測定す
るために必要な、剪断波を地盤に与えることができる。
EFFECT OF THE INVENTION By using the shear wave generator of the present invention, it is possible to apply the shear wave required for measuring the liquefaction strength relatively easily and more accurately at the present position to the ground.
【0024】さらに、本発明の方法によれば、現位置で
比較的容易にかつより正確に液状化強度を測定できる。
Furthermore, according to the method of the present invention, the liquefaction strength can be measured at the present position relatively easily and more accurately.
【図面の簡単な説明】[Brief description of drawings]
【図1】本発明の1態様である剪断波発生装置の斜視図
である。
FIG. 1 is a perspective view of a shear wave generator that is one embodiment of the present invention.
【図2】図1の装置のA−A’拡大部分断面図である。FIG. 2 is an enlarged partial sectional view taken along the line A-A ′ of the apparatus of FIG.
【図3】本発明の1態様である剪断波発生装置の斜視図
である。
FIG. 3 is a perspective view of a shear wave generator that is one embodiment of the present invention.
【図4】図3の装置のB−B’拡大部分断面図である。FIG. 4 is an enlarged partial sectional view taken along the line B-B ′ of the apparatus of FIG.
【図5】図4の装置のC−C’断面図である。5 is a cross-sectional view taken along the line C-C ′ of the apparatus of FIG.
【図6】本発明の液状化強度測定方法の説明図である。FIG. 6 is an explanatory diagram of a liquefaction strength measuring method of the present invention.
【図7】剪断波応力τd1と過剰間隙水圧Δu1 との関係
を示す図である。
FIG. 7 is a diagram showing the relationship between shear wave stress τ d1 and excess pore water pressure Δu 1 .
【図8】液状化強度を求めるに必要な応力比RL =τ
d123/δv'とN=δv'/Δu123 との関係を示す図であ
る。
FIG. 8: Stress ratio R L = τ required to obtain liquefaction strength
d123 / .delta.v 'and N = .delta.v' is a diagram showing the relationship between / Delta] u 123.
【記号の説明】[Explanation of symbols]
1:剪断波発生装置 2:剪断波発生部 3:固定手段 4:剪断波発生部2の電源 5:固定手段3を稼働させるための源 6:間隙水圧計 7:加速度計 8:記録装置 9:地盤に開けた孔 10:地盤 11、18:容器 12、13、24:ストッパー 14、19:錘 15、21:軸 16:孔 17:電磁石17 23:突起 30、31:支持板 32:支持手段 1: Shear wave generator 2: Shear wave generator 3: Fixing means 4: Power supply for shear wave generator 2 5: Source for operating the fixing means 3 6: Pore pressure gauge 7: Accelerometer 8: Recording device 9 : Hole in the ground 10: Ground 11, 18: Container 12, 13, 24: Stopper 14, 19: Weight 15, 21: Shaft 16: Hole 17: Electromagnet 17 23: Protrusion 30, 31: Support plate 32: Support means

Claims (2)

    【特許請求の範囲】[Claims]
  1. 【請求項1】 剪断波発生部及び該剪断波発生部を地盤
    に開けた孔内に固定し、かつ該剪断波発生部で発生させ
    た剪断波を地盤に伝える固定手段からなる、剪断波を地
    盤に与える装置であって、前記剪断波発生部は、往復動
    し、ストッパーに衝突することにより剪断波を発生させ
    る錘、該錘を往復動させる駆動手段、並びに前記錘及び
    駆動手段を収納し、内部に前記ストッパーを設け、かつ
    前記錘の往復動により発生した剪断波を地盤孔の内壁に
    伝えるための容器とからなり、前記固定手段は、対向す
    る一対の支持板及び該支持板の間を架橋し、かつ該支持
    板の間隔を変動させることが可能な少なくとも2つの支
    柱手段とからなり、前記支持板のいずれか一方に前記剪
    断波発生部の容器が固定されていることを特徴とする前
    記装置。
    1. A shear wave comprising a shear wave generating part and a fixing means for fixing the shear wave generating part in a hole opened in the ground and for transmitting the shear wave generated in the shear wave generating part to the ground. A device for applying to the ground, wherein the shear wave generating section accommodates a weight that reciprocates and generates a shear wave by colliding with a stopper, a driving unit that reciprocates the weight, and the weight and the driving unit. And a container for transmitting the shear wave generated by the reciprocating movement of the weight to the inner wall of the ground hole, wherein the fixing means bridges between a pair of opposing support plates and the support plates. And at least two strut means capable of varying the distance between the supporting plates, and the container of the shear wave generating part is fixed to either one of the supporting plates. apparatus.
  2. 【請求項2】 地盤に開けた孔内に設置した請求項1記
    載の装置から地盤に剪断波を繰り返し与え、地盤内を伝
    播した剪断波により変化する間隙水圧を、前記孔と同一
    の孔内に上記装置から一定距離に設置した間隙水圧計に
    より測定することを特徴とする地盤の液状化強度の測定
    方法。
    2. A shear wave is repeatedly applied to the ground from the device according to claim 1, which is installed in a hole opened in the ground, and a pore water pressure that changes by the shear wave propagating in the ground is generated in the same hole as the hole. A method for measuring the liquefaction strength of the ground, which comprises measuring with a pore water pressure gauge installed at a constant distance from the above device.
JP16511891A 1991-06-10 1991-06-10 Device for providing shearing wave for ground and measuring method of liquefaction strength Pending JPH0593416A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16511891A JPH0593416A (en) 1991-06-10 1991-06-10 Device for providing shearing wave for ground and measuring method of liquefaction strength

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16511891A JPH0593416A (en) 1991-06-10 1991-06-10 Device for providing shearing wave for ground and measuring method of liquefaction strength

Publications (1)

Publication Number Publication Date
JPH0593416A true JPH0593416A (en) 1993-04-16

Family

ID=15806258

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16511891A Pending JPH0593416A (en) 1991-06-10 1991-06-10 Device for providing shearing wave for ground and measuring method of liquefaction strength

Country Status (1)

Country Link
JP (1) JPH0593416A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107907295A (en) * 2017-10-23 2018-04-13 中国地质大学(武汉) The geotechnical centrifuge case that a kind of remote control circulating analog tsunami acts on slight slope
US10195005B2 (en) 2014-03-06 2019-02-05 Tepe Munhygienprodukter Ab Interdental cleaner

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10195005B2 (en) 2014-03-06 2019-02-05 Tepe Munhygienprodukter Ab Interdental cleaner
CN107907295A (en) * 2017-10-23 2018-04-13 中国地质大学(武汉) The geotechnical centrifuge case that a kind of remote control circulating analog tsunami acts on slight slope

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